Date   

Re: Powering the Raspberry & TNC.

Ray Wells
 

Edit for anyone who thought I'd actually run the Pi off 12V.

I favoured the use of a smps over a linear supply for the Pi to reduce energy wastage. To run the Pi from a 12v supply (car battery) and assuming 1A load, 7W would be dissipated as heat in the 5V regulator, twice the energy input of the Pi itself.

Ray vk2tv

On 06/04/13 08:10, Ray Wells wrote:
 

That part is identical with the units I bought from Hong Kong. My CRO shows the output under 1A load to be quite dirty, a lot dirtier than another supply I used that cause problems with the Pi. I do believe, however, that external output LC filtering as suggested by National Semiconductor would make the supply suitable as far as output quality is concerned. My secondary concern is the amount of RF pollution the device might cause, important to me because I use the Pi in a radio application. A ventilated metal enclosure with filtering appropriate for RF might provide an answer. Having spent less than $8 for five of these devices, I wasn't particularly inclined to spend a lot of time and effort to make them environmentally (my environment) friendly.

I favoured the use of a smps over a linear supply for the Pi to reduce energy wastage. To run the Pi from a 12v supply (car battery) and assuming 1A load, 7W would be dissipated as heat, twice the energy input of the Pi itself.

Ray vk2tv

On 05/04/13 23:57, Roger Elmore wrote:
 

This is what I've got heading across the pond:

http://www.amazon.com/gp/product/B009HPB1OI/ref=oh_details_o02_s00_i00?ie=UTF8&psc=1

Looks like a similar parts count but a rectangular PCB with solder I/O as opposed to the square format and I/O header connections yours has.

My idea was set the LM2596 module at 5V no load, then power the PI and TNC-PI and adjust the LM2596 for 5V at TP1 and TP2 on the PI. With a fixed 5V LM2940 following the LM2596, I assume that adjustment ability would be lost.

I'm working on parts placement with this drawing:

http://www.utm.edu/staff/relmore/PICase.gif

so you can see I have lots of room in the interior of the 2U case (the PCBs will be mounted on plastic stand-offs on the 203.2mm x 254mm dual-sided copper-clad board, the location of the TNC and PIs will swap if the 50.8mm flexible Bivar light pipes work out).

Since I have so much interior room and a fan that could blow directly on heat sinks, what are the thoughts of simply using an old school TO-220 package LM317?
--
Roger KJ4AJP

>>>>>>>>>>>>>>><<<<<<<<<<<<<<<

Stephen wrote:

> Hi again,
>
> I made a mistake. I used one of these which has a variable output
> voltage :-
>
> http://www.ebay.co.uk/itm/5pcs-LM2596-DC-DC-Converter-4-40V-1-5-
> 35V-Step-down-Power-Supply-Module-
> /180903490175?_trksid=p5197.m1992&_trkparms=aid%3D111000%26algo%3
> DREC.CURRENT%26ao%3D1%26asc%3D14%26meid%3D6745660872094298825%26p
> id%3D100015%26prg%3D1006%26rk%3D1%26sd%3D180903490175%26
>
> 73s Steve G0XAR
>
> --- In Raspberry_Pi_4-Ham_RADIO@..., "Stephen"
> wrote:
> >
> > Roger,
> >
> > I use the same module, but I clean up the output by passing it
> through a LM2940 3 leg 5 volt LDO regulator (with the caps each
> side as you would use for a standard application). I don't have
> any objective measurements but the data sheet quotes an output
> noise voltage of 150 uV. The whole lot fits into an altoids tin.
> >
> > Hope this helps,
> >
> > Steve G0XAR
> >
> > --- In Raspberry_Pi_4-Ham_RADIO@..., Ian Bennett
> wrote:
> > >
> > > Hi Ray,
> > > I think I have the same type and managed about 2A (ish)
> output at
> > > 5V with very respectable ripple (read: hardly noticeable on
> the
> > > cro). I was a little disappointed seeing the output at 4.85V
> but was withing spec.
> > > I have been bitten a few times because I didn't read the
> data sheet
> > > correctly, so I read the thing many many times whilst waiting
> for
> > > mine to arrive.
> > > The one thing (ok, there was two) that stuck in my mind was
> the use
> > > of low leakage electros and the low loss "tracks" required
> )shown in
> > > bold in the recommended circuit).
> > > I built mine on vero board and the the low loss connections
> were
> > > constructed using additional tinned copper wire following the
> copper
> > > and a heap of solder to fill the gaps. If nothing else, it
> won't
> > > blow away in the wind ;-)
> > > My coil came out of a few trashed UPS'. I was ratting them
> for the
> > > toroids but luckily I kept a few intact.
> > >
> > > Ian
> > >
> > >
> > > On 05/04/13 08:51, Ray Wells wrote:
> > > >
> > > >
> > > > I bought 5, smps adjustable output modules using the LM2596
> from
> > > > Ebay
> > > > ($1.52 each including freight from Hong Kong to
> Australia!). These
> > > > are branded Leivin and the PCB layout and circuit is as per
> the
> > > > National Semi datasheet. A preliminary test with a 1A load
> showed
> > > > a very noisy output on the CRO. When time permits I'll try
> the NS
> > > > recommendation of an LC filter in the output. I think the
> device
> > > > has potential but not "off the shelf" for running the RPi.
> > > >
> > > > Ray vk2tv
> > > >
> > > > On 05/04/13 00:58, Roger Elmore wrote:
> > > >>
> > > >> Charles wrote:
> > > >> > I am looking at another device to replace the converter
> because
> > > >> > this device is not adjustable and is set for 5 V. I need
> to
> > > >> > increase that to 5.25 to compensate for the drop across
> the
> > > >> > polyfuse.
> > > >>
> > > >> I've begun collecting the parts for a pair of PI+TNC-PI
> combos
> > > >> (for an APRX digi/IGate and a Linux RMS Gateway) in a rack
> mount
> > > >> case powered from the same Astron RS-50M as the two radios
> and
> > > >> going to give the $7
> > > >> LM2596 module (bought from Amazon) a try. 3-40V in and
> 1.5-35V
> > > >> out at 3A. My plan is to use a separate LM2596 fused at 1A
> for
> > > >> each PI's input, with a 6A rear panel accessible fuse
> common to
> > > >> the 13.8V input of each LM2596 and a 80mm fan. Here goes
> nothing...
> > > >>
> > > >> On a different note, has anyone experimented with light
> pipes to
> > > >> bring the PI's LED status to the front panel of a chassis?
> I've
> > > >> used the Bivar SLP3-450-100-F on a NHRC Micro repeater
> controller
> > > >> previously but the LEDs on the PI are too close together
> for
> > > >> those. I was looking at the flexible Bivar LC-2.0 at the
> Mouser
> > > >> website and was wondering if those might work. Any input
> from anyone?
> > > >> --
> > > >> Roger KJ4AJP
> > > >>
> > > >
> > > >
> > > >
> > > >
> > >
> >
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>




Re: Powering the Raspberry & TNC.

Ray Wells
 

That part is identical with the units I bought from Hong Kong. My CRO shows the output under 1A load to be quite dirty, a lot dirtier than another supply I used that cause problems with the Pi. I do believe, however, that external output LC filtering as suggested by National Semiconductor would make the supply suitable as far as output quality is concerned. My secondary concern is the amount of RF pollution the device might cause, important to me because I use the Pi in a radio application. A ventilated metal enclosure with filtering appropriate for RF might provide an answer. Having spent less than $8 for five of these devices, I wasn't particularly inclined to spend a lot of time and effort to make them environmentally (my environment) friendly.

I favoured the use of a smps over a linear supply for the Pi to reduce energy wastage. To run the Pi from a 12v supply (car battery) and assuming 1A load, 7W would be dissipated as heat, twice the energy input of the Pi itself.

Ray vk2tv

On 05/04/13 23:57, Roger Elmore wrote:
 

This is what I've got heading across the pond:

http://www.amazon.com/gp/product/B009HPB1OI/ref=oh_details_o02_s00_i00?ie=UTF8&psc=1

Looks like a similar parts count but a rectangular PCB with solder I/O as opposed to the square format and I/O header connections yours has.

My idea was set the LM2596 module at 5V no load, then power the PI and TNC-PI and adjust the LM2596 for 5V at TP1 and TP2 on the PI. With a fixed 5V LM2940 following the LM2596, I assume that adjustment ability would be lost.

I'm working on parts placement with this drawing:

http://www.utm.edu/staff/relmore/PICase.gif

so you can see I have lots of room in the interior of the 2U case (the PCBs will be mounted on plastic stand-offs on the 203.2mm x 254mm dual-sided copper-clad board, the location of the TNC and PIs will swap if the 50.8mm flexible Bivar light pipes work out).

Since I have so much interior room and a fan that could blow directly on heat sinks, what are the thoughts of simply using an old school TO-220 package LM317?
--
Roger KJ4AJP

>>>>>>>>>>>>>>><<<<<<<<<<<<<<<

Stephen wrote:

> Hi again,
>
> I made a mistake. I used one of these which has a variable output
> voltage :-
>
> http://www.ebay.co.uk/itm/5pcs-LM2596-DC-DC-Converter-4-40V-1-5-
> 35V-Step-down-Power-Supply-Module-
> /180903490175?_trksid=p5197.m1992&_trkparms=aid%3D111000%26algo%3
> DREC.CURRENT%26ao%3D1%26asc%3D14%26meid%3D6745660872094298825%26p
> id%3D100015%26prg%3D1006%26rk%3D1%26sd%3D180903490175%26
>
> 73s Steve G0XAR
>
> --- In Raspberry_Pi_4-Ham_RADIO@..., "Stephen"
> wrote:
> >
> > Roger,
> >
> > I use the same module, but I clean up the output by passing it
> through a LM2940 3 leg 5 volt LDO regulator (with the caps each
> side as you would use for a standard application). I don't have
> any objective measurements but the data sheet quotes an output
> noise voltage of 150 uV. The whole lot fits into an altoids tin.
> >
> > Hope this helps,
> >
> > Steve G0XAR
> >
> > --- In Raspberry_Pi_4-Ham_RADIO@..., Ian Bennett
> wrote:
> > >
> > > Hi Ray,
> > > I think I have the same type and managed about 2A (ish)
> output at
> > > 5V with very respectable ripple (read: hardly noticeable on
> the
> > > cro). I was a little disappointed seeing the output at 4.85V
> but was withing spec.
> > > I have been bitten a few times because I didn't read the
> data sheet
> > > correctly, so I read the thing many many times whilst waiting
> for
> > > mine to arrive.
> > > The one thing (ok, there was two) that stuck in my mind was
> the use
> > > of low leakage electros and the low loss "tracks" required
> )shown in
> > > bold in the recommended circuit).
> > > I built mine on vero board and the the low loss connections
> were
> > > constructed using additional tinned copper wire following the
> copper
> > > and a heap of solder to fill the gaps. If nothing else, it
> won't
> > > blow away in the wind ;-)
> > > My coil came out of a few trashed UPS'. I was ratting them
> for the
> > > toroids but luckily I kept a few intact.
> > >
> > > Ian
> > >
> > >
> > > On 05/04/13 08:51, Ray Wells wrote:
> > > >
> > > >
> > > > I bought 5, smps adjustable output modules using the LM2596
> from
> > > > Ebay
> > > > ($1.52 each including freight from Hong Kong to
> Australia!). These
> > > > are branded Leivin and the PCB layout and circuit is as per
> the
> > > > National Semi datasheet. A preliminary test with a 1A load
> showed
> > > > a very noisy output on the CRO. When time permits I'll try
> the NS
> > > > recommendation of an LC filter in the output. I think the
> device
> > > > has potential but not "off the shelf" for running the RPi.
> > > >
> > > > Ray vk2tv
> > > >
> > > > On 05/04/13 00:58, Roger Elmore wrote:
> > > >>
> > > >> Charles wrote:
> > > >> > I am looking at another device to replace the converter
> because
> > > >> > this device is not adjustable and is set for 5 V. I need
> to
> > > >> > increase that to 5.25 to compensate for the drop across
> the
> > > >> > polyfuse.
> > > >>
> > > >> I've begun collecting the parts for a pair of PI+TNC-PI
> combos
> > > >> (for an APRX digi/IGate and a Linux RMS Gateway) in a rack
> mount
> > > >> case powered from the same Astron RS-50M as the two radios
> and
> > > >> going to give the $7
> > > >> LM2596 module (bought from Amazon) a try. 3-40V in and
> 1.5-35V
> > > >> out at 3A. My plan is to use a separate LM2596 fused at 1A
> for
> > > >> each PI's input, with a 6A rear panel accessible fuse
> common to
> > > >> the 13.8V input of each LM2596 and a 80mm fan. Here goes
> nothing...
> > > >>
> > > >> On a different note, has anyone experimented with light
> pipes to
> > > >> bring the PI's LED status to the front panel of a chassis?
> I've
> > > >> used the Bivar SLP3-450-100-F on a NHRC Micro repeater
> controller
> > > >> previously but the LEDs on the PI are too close together
> for
> > > >> those. I was looking at the flexible Bivar LC-2.0 at the
> Mouser
> > > >> website and was wondering if those might work. Any input
> from anyone?
> > > >> --
> > > >> Roger KJ4AJP
> > > >>
> > > >
> > > >
> > > >
> > > >
> > >
> >
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>



Re: WsprryPi

Robert Nickels <w9ran@...>
 

It was probably obvious from my previous comment that I was anxious for the WSPR.NET website to come back up so I could again test my Pi transmitter. But it turns out the database was running all along even when the website was down, and to my surprise there were over 165 spots in the database from the past 15 hours, including several spots from France - 6976 km distant! This was all on 20 meters using a homebrew LPF connected to the Pi, and feeding a 3 element SteppIR (which was pointed at the southeast US). I was hoping that having a good antenna would help, but this really blows me away. I turned the beam toward Europe about 10 minutes ago and just got a spot from Belgium - around the world on a GPIO pin!

A big thanks to Guido and others who have made this possible and to Eddie, Paul, and those who have helped me overcome a few obstacles. I'm a believer!

73, Bob W9RAN


Re: WsprryPi for WSPR15

psk31 <psk31@...>
 

Hi Guido

Thanks for your reply.

Yes I chose to calibrate via the command line because it is easier and requires no modifications after updates. Also I was not able to see a linear relationship for each band with a rising error toward F_Xtal and then falling again after,  I would need to look at this again as I have not double checked. I must also try calibrating F_Xtal in the code and check the result.
At present I am doing a major shack tidy, too many projects one after the other have taken their toll including creating trip wires across the floor so it may take a while.

Yes the command line argument method was what I thought would be good. Particularly for LF / MF and WSPR15 as there are experiments undertaken which could involve fixing a sked on a quiet QRG out of the standard window. Additionally the 'band plan' for 474KHz is not yet set in stone.

A program called ./tx that supports different modes (wspr, opera, hell, cw). Interested yes definitely. :-)  . Keep up the good work.

73 Eddie G3ZJO

On 05/04/2013 15:09, Guido wrote:
 
Hi Eddie,

Thank you very much for reporting your results regarding the WSPR-15 mode, and congratulation with your first on 474kHz!
It is very good that you have tested this out, as I did not have a means to test it myself. So the theory seems to work in practice.

Yes calibrating via the command line no longer works since I made the mode dependent on the frequency entered. The best is to calibrate the F_XTAL variable in the code. When done it WsprryPi should be exact on frequency on all frequency bands. Did I understand you correctly that there is still a frequency offset when changing bands? Not sure what the cause of this could be, but I need to analyse this, if you can confirm me this.

Your suggestion of specifying the mode as command line argument, could be a solution. I am also thinking to make the F_XTAL changeable with an environment variable that can be entered in the command-line, e.g.: export FXTAL=19200123  Currently I am experimenting with a command-line program called ./tx that support different modes (wspr, opera, hell, cw), and returns when a single transmission has been done, let me know if you are interested in this.

73, Guido
PE1NNZ



On Wed, Apr 3, 2013 at 1:00 PM, g3zjo <psk31@...> wrote:
Hi Group

Guido I am not sure if you get my PM's. I put a 100mW PA on the Pi and had great success with WSPR15 over a 127Km path on 474Khz which was not possible using WSPR2.
Now using my 1W PA. For my 10W PA I am working on a different driver.

There is a problem when using the Command Line to calibrate the oscillator. As the software uses the frequency to set the mode, WSPR15 can only be transmitted out of zone.

I would like to see the mode selectable in the command line something like.

sudo ./wspr <[prefix]/callsign[/suffix]> [ ...] []

e.g.: sudo ./wspr PA/K1JT JO21 10 7040074 0 0 10140174 15 0 0

73 Eddie G3ZJO




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Re: Wsprnet.org

Robert Nickels <w9ran@...>
 

On 4/5/2013 10:50 AM, Dave Cochran wrote:
they missed their renewal date
My first thought was that their server had been overloaded by the barrage of incoming spots of my Raspberry Pi transmitter, which I first put on the air last night ;-) So I guess now I'll just have to be patient til the site gets back online - but what great timing, eh?

I left it running anyhow - so if anyone is hearing W9RAN on 20 meters, that's a Pi talking.

73, Bob W9RAN


Wsprnet.org

Dave Cochran <dave@...>
 

Finally got a little time set aside to start reading up on WSPR.. wsprnet.org seemed like a good place to start according to google....  if anyone knows who owns the domain you might want to pass along that they missed their renewal date (expired yesterday) and their DNS records have been redirected to a godaddy splashpage.

Dave - N0TRQ

On Apr 5, 2013 9:21 AM, "Guido" <threeme3@...> wrote:
 

Hi Eddie,

Thank you very much for reporting your results regarding the WSPR-15 mode, and congratulation with your first on 474kHz!
It is very good that you have tested this out, as I did not have a means to test it myself. So the theory seems to work in practice.

Yes calibrating via the command line no longer works since I made the mode dependent on the frequency entered. The best is to calibrate the F_XTAL variable in the code. When done it WsprryPi should be exact on frequency on all frequency bands. Did I understand you correctly that there is still a frequency offset when changing bands? Not sure what the cause of this could be, but I need to analyse this, if you can confirm me this.

Your suggestion of specifying the mode as command line argument, could be a solution. I am also thinking to make the F_XTAL changeable with an environment variable that can be entered in the command-line, e.g.: export FXTAL=19200123  Currently I am experimenting with a command-line program called ./tx that support different modes (wspr, opera, hell, cw), and returns when a single transmission has been done, let me know if you are interested in this.

73, Guido
PE1NNZ



On Wed, Apr 3, 2013 at 1:00 PM, g3zjo <psk31@...> wrote:
Hi Group

Guido I am not sure if you get my PM's. I put a 100mW PA on the Pi and had great success with WSPR15 over a 127Km path on 474Khz which was not possible using WSPR2.
Now using my 1W PA. For my 10W PA I am working on a different driver.

There is a problem when using the Command Line to calibrate the oscillator. As the software uses the frequency to set the mode, WSPR15 can only be transmitted out of zone.

I would like to see the mode selectable in the command line something like.

sudo ./wspr <[prefix]/callsign[/suffix]> <power in dBm> [ ...] []

e.g.: sudo ./wspr PA/K1JT JO21 10 7040074 0 0 10140174 15 0 0

73 Eddie G3ZJO




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Re: WsprryPi for WSPR15

Guido PE1NNZ
 

Hi Eddie,

Thank you very much for reporting your results regarding the WSPR-15 mode, and congratulation with your first on 474kHz!
It is very good that you have tested this out, as I did not have a means to test it myself. So the theory seems to work in practice.

Yes calibrating via the command line no longer works since I made the mode dependent on the frequency entered. The best is to calibrate the F_XTAL variable in the code. When done it WsprryPi should be exact on frequency on all frequency bands. Did I understand you correctly that there is still a frequency offset when changing bands? Not sure what the cause of this could be, but I need to analyse this, if you can confirm me this.

Your suggestion of specifying the mode as command line argument, could be a solution. I am also thinking to make the F_XTAL changeable with an environment variable that can be entered in the command-line, e.g.: export FXTAL=19200123  Currently I am experimenting with a command-line program called ./tx that support different modes (wspr, opera, hell, cw), and returns when a single transmission has been done, let me know if you are interested in this.

73, Guido
PE1NNZ



On Wed, Apr 3, 2013 at 1:00 PM, g3zjo <psk31@...> wrote:
Hi Group

Guido I am not sure if you get my PM's. I put a 100mW PA on the Pi and had great success with WSPR15 over a 127Km path on 474Khz which was not possible using WSPR2.
Now using my 1W PA. For my 10W PA I am working on a different driver.

There is a problem when using the Command Line to calibrate the oscillator. As the software uses the frequency to set the mode, WSPR15 can only be transmitted out of zone.

I would like to see the mode selectable in the command line something like.

sudo ./wspr <[prefix]/callsign[/suffix]> [ ...] []

e.g.: sudo ./wspr PA/K1JT JO21 10 7040074 0 0 10140174 15 0 0

73 Eddie G3ZJO




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Re: Another alternaive to linix?

Dave Cochran <dave@...>
 

I guess it really depends on just what you need as a tutorial.  Linux in general is by and large the most well documented OS of all time. 

Can you be more specific here?  I've been using Linux since the early/mid 90's both personally and professionally so I might be able to help a bit if there is something specific needed.

Dave
N0TRQ

>  
>
> seems to me that the whole purpose of Pi is to be a reasonably priced learning tool.
> Linux isn't the easiest which I can well understand since we have all been dumbed down by iPads(iOSs) and WinDoze.
> perhaps a good tutorial for Linux might be of help.
> Just my 2 cents worth ...


Vedr: Raspberry Pi as WSPR transmitter up to 250Mhz

LA3JJ
 

Hi Guido,
Thanks for the last versions of WsprryPi.
There are of course always more to wish for.
The communication between us has not been perfect.
I will try to summarize my comments.

1. Calibration.
I would like to suggest that the calibration should always be done for a particular RasPi board before any txing is performed.
The calibrating could be done in a few steps by the command wspr LA3JJ JO59 10 10140200 C  offset, where offset  may be + or - 1, 10 ,100 . This because to use the editor vi and a new compilation is a bit complicated. When a board has been calibrated it has been so for life, so the value should be saved in a file in the home dir and be automatically used the next time when a new version is loaded.

2. Hash coding.
To be able to run txing of longer messages hash coding concept has been used. In my Arduino applications I have still not implemented this, but instead used the program from W3PM to generate the two messages on my W7 PC. When I in advance know the location I have made sets of the relevant dual symbol codes hard coded and select-able from my Arduino LCD screen. The hash coding seemed a bit over my head. At W3PM's pages there are examples of this, but so far I will not go into this for my part. (It would have been nice to have it implemented though as my Arduino is interfaced to a GPS module and calculates the Maidenhead location continuously.)

3. Time sync.
The WsprrPi uses time sync via the internet. It would have been nice to have sync from a GPS module also to be able to run it really portable.
point a) here is to read and decode GPS time from a GPS module like I have done in my Arduino. Or pint b) to have an input pin (or two) on the RasPi where GPS generated minute time pulses could be received.

4. Multiple band operation.
I made a comment of this:   http://wsprnet.org/drupal/node/3994#comment-9882

 At the moment I am visiting family at loc JP54 and as my present WsprryPi needs wired internet connection I decided not to bring it along.
I do hope I will be able to make it a fully portable rig in the future.
At the age of 70 now I am learning a little more about C and Python coding every day, but it moves on very slowly.

73
Jon Ove, la3jj

.

Fra: Guido Til: Raspberry_Pi_4-Ham_RADIO@...
Sendt: Mandag, 1. april 2013 20.04
Emne: Re: [Raspberry_Pi_4-Ham_RADIO] Raspberry Pi as WSPR transmitter up to 250Mhz

 
There is an update of WsprryPi, now supporting some new features that was requested by few:

1. the slower brother of WSPR-2 is supported called WSPR-15. To use it, specify a frequency in the 25Hz sub-band that is just above the regular wspr band:
     LF   137400 - 137600
          137600 - 137625 (WSPR-15)
     MF   475600 - 475800
          475800 - 475825 (WSPR-15)
    160m  1838000 - 1838200
          1838200 - 1838225 (WSPR-15)

2. it is now possible to specify either a prefix or suffix in the callsign.
Prefix may contain up to three characters before the callsign, e.g: EA8/PE1NNZ or F/PE1NNZ.
Suffixes may contain a single alphanumeric character or double digit, e.g: PE1NNZ/p, PE1NNZ/1, PE1NNZ/99

New features can be downloaded in github: https://github.com/threeme3/WsprryPi.git

73, Guido
PE1NNZ


On Fri, Mar 29, 2013 at 2:55 AM, Robert Nickels <w9ran@...> wrote:
On 3/28/2013 12:51 PM, psk31 wrote:
> No surprises there,

Not for an experienced guy like you Eddie, but I'm in awe!     I'm off
to make LPF - would appreciate any suggestion as to which band(s) are
best - otherwise I'll probably try 20 meters.   Will be my first
go-round with WSPR.

Nice work, all!

73, Bob W9RAN


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Re: Powering the Raspberry & TNC.

Roger Elmore
 

This is what I've got heading across the pond:

http://www.amazon.com/gp/product/B009HPB1OI/ref=oh_details_o02_s00_i00?ie=UTF8&psc=1

Looks like a similar parts count but a rectangular PCB with solder I/O as opposed to the square format and I/O header connections yours has.

My idea was set the LM2596 module at 5V no load, then power the PI and TNC-PI and adjust the LM2596 for 5V at TP1 and TP2 on the PI. With a fixed 5V LM2940 following the LM2596, I assume that adjustment ability would be lost.

I'm working on parts placement with this drawing:

http://www.utm.edu/staff/relmore/PICase.gif

so you can see I have lots of room in the interior of the 2U case (the PCBs will be mounted on plastic stand-offs on the 203.2mm x 254mm dual-sided copper-clad board, the location of the TNC and PIs will swap if the 50.8mm flexible Bivar light pipes work out).

Since I have so much interior room and a fan that could blow directly on heat sinks, what are the thoughts of simply using an old school TO-220 package LM317?
--
Roger KJ4AJP

<<<<<<<<<<<<<<<
Stephen wrote:

Hi again,

I made a mistake. I used one of these which has a variable output
voltage :-

http://www.ebay.co.uk/itm/5pcs-LM2596-DC-DC-Converter-4-40V-1-5-
35V-Step-down-Power-Supply-Module-
/180903490175?_trksid=p5197.m1992&_trkparms=aid%3D111000%26algo%3
DREC.CURRENT%26ao%3D1%26asc%3D14%26meid%3D6745660872094298825%26p
id%3D100015%26prg%3D1006%26rk%3D1%26sd%3D180903490175%26

73s Steve G0XAR

--- In Raspberry_Pi_4-Ham_RADIO@yahoogroups.com, "Stephen"
<squirrox@...> wrote:

Roger,

I use the same module, but I clean up the output by passing it
through a LM2940 3 leg 5 volt LDO regulator (with the caps each
side as you would use for a standard application). I don't have
any objective measurements but the data sheet quotes an output
noise voltage of 150 uV. The whole lot fits into an altoids tin.

Hope this helps,

Steve G0XAR

--- In Raspberry_Pi_4-Ham_RADIO@yahoogroups.com, Ian Bennett
<ibennett@> wrote:

Hi Ray,
I think I have the same type and managed about 2A (ish)
output at
5V with very respectable ripple (read: hardly noticeable on
the
cro). I was a little disappointed seeing the output at 4.85V
but was withing spec.
I have been bitten a few times because I didn't read the
data sheet
correctly, so I read the thing many many times whilst waiting
for
mine to arrive.
The one thing (ok, there was two) that stuck in my mind was
the use
of low leakage electros and the low loss "tracks" required
)shown in
bold in the recommended circuit).
I built mine on vero board and the the low loss connections
were
constructed using additional tinned copper wire following the
copper
and a heap of solder to fill the gaps. If nothing else, it
won't
blow away in the wind ;-)
My coil came out of a few trashed UPS'. I was ratting them
for the
toroids but luckily I kept a few intact.

Ian


On 05/04/13 08:51, Ray Wells wrote:


I bought 5, smps adjustable output modules using the LM2596
from
Ebay
($1.52 each including freight from Hong Kong to
Australia!). These
are branded Leivin and the PCB layout and circuit is as per
the
National Semi datasheet. A preliminary test with a 1A load
showed
a very noisy output on the CRO. When time permits I'll try
the NS
recommendation of an LC filter in the output. I think the
device
has potential but not "off the shelf" for running the RPi.

Ray vk2tv

On 05/04/13 00:58, Roger Elmore wrote:

Charles wrote:
I am looking at another device to replace the converter
because
this device is not adjustable and is set for 5 V. I need
to
increase that to 5.25 to compensate for the drop across
the
polyfuse.
I've begun collecting the parts for a pair of PI+TNC-PI
combos
(for an APRX digi/IGate and a Linux RMS Gateway) in a rack
mount
case powered from the same Astron RS-50M as the two radios
and
going to give the $7
LM2596 module (bought from Amazon) a try. 3-40V in and
1.5-35V
out at 3A. My plan is to use a separate LM2596 fused at 1A
for
each PI's input, with a 6A rear panel accessible fuse
common to
the 13.8V input of each LM2596 and a 80mm fan. Here goes
nothing...

On a different note, has anyone experimented with light
pipes to
bring the PI's LED status to the front panel of a chassis?
I've
used the Bivar SLP3-450-100-F on a NHRC Micro repeater
controller
previously but the LEDs on the PI are too close together
for
those. I was looking at the flexible Bivar LC-2.0 at the
Mouser
website and was wondering if those might work. Any input
from anyone?
--
Roger KJ4AJP




------------------------------------

Yahoo! Groups Links



Re: Powering the Raspberry & TNC.

Ron Wright <mccrpt@...>
 

It looks different than a larger 7805, but who knows what is inside, hi.  It does have similar spec except it can handle 1.5A instead of 1.0A.

There are versions of the 7805 that handle 3 Amps.  Also some 7805s have a near zero volt drop or need less than 6V input.  See some info at:
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CE4QFjAB&url=http%3A%2F%2Fwww.micrel.com%2F_PDF%2Fmic29150.pdf&ei=18BeUZ6EHIGm8ASgyoC4Dg&usg=AFQjCNGNtaCUHG3irZ7yWAZDFW7_jwQsBA&sig2=mXahlbfJ7y0dPpM21TKVeA&bvm=bv.44770516,d.eWU

If one had good heat sinking and input say like 8-9 V then a regular 7805 would handle the Pi.

I simply bought a 5V wal-wart that had the micro-USB connector with it.  I got from MCM Electronics at https://www.mcmelectronics.com/default.aspx

MCM has the wal-wart for less than $7 at http://www.mcmelectronics.com/product/28-13055

I think I've spent more on Pi accessories and other items like USB keyboard than the Pi cost, hi.  Isn't that the way things work.

73, ron, n9ee/r

Ron Wright, N9EE/R
BSEE
Micro Computer Concepts
352-683-4476
mccrpt@...



To: Raspberry_Pi_4-Ham_RADIO@...
From: k4rjjradio@...
Date: Thu, 4 Apr 2013 23:23:50 -0400
Subject: Re: [Raspberry_Pi_4-Ham_RADIO] Powering the Raspberry & TNC.

 

Charles this is just a better 7805 right?  I got two.  What fuse type and value are you using on yours?

Ronny
K4RJJ



On Mon, Apr 1, 2013 at 2:15 PM, Charles <k4gbb1@...> wrote:
 
For those who plan to power the Raspberry, TNC and radio package from a 12VDC source.....
Here is the DC to DC converter that I have been using since July of last year w/o an problems. The 1.5 A output is more than enough to supply the TNC-Pi and Raspberry.

This little inexpensive device was $4.30 plus shipping:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=811-2196-5-ND

<>
k4gbb





Re: Powering the Raspberry & TNC.

Stephen <squirrox@...>
 

--- In Raspberry_Pi_4-Ham_RADIO@yahoogroups.com, "Stephen" <squirrox@...> wrote:

Roger,

I use the same module, but I clean up the output by passing it through a LM2940 3 leg 5 volt LDO regulator (with the caps each side as you would use for a standard application). I don't have any objective measurements but the data sheet quotes an output noise voltage of 150 uV. The whole lot fits into an altoids tin.

Hope this helps,

Steve G0XAR

--- In Raspberry_Pi_4-Ham_RADIO@yahoogroups.com, Ian Bennett <ibennett@> wrote:

Hi Ray,
I think I have the same type and managed about 2A (ish) output at 5V
with very respectable ripple (read: hardly noticeable on the cro). I was
a little disappointed seeing the output at 4.85V but was withing spec.
I have been bitten a few times because I didn't read the data sheet
correctly, so I read the thing many many times whilst waiting for mine
to arrive.
The one thing (ok, there was two) that stuck in my mind was the use of
low leakage electros and the low loss "tracks" required )shown in bold
in the recommended circuit).
I built mine on vero board and the the low loss connections were
constructed using additional tinned copper wire following the copper and
a heap of solder to fill the gaps. If nothing else, it won't blow away
in the wind ;-)
My coil came out of a few trashed UPS'. I was ratting them for the
toroids but luckily I kept a few intact.

Ian


On 05/04/13 08:51, Ray Wells wrote:


I bought 5, smps adjustable output modules using the LM2596 from Ebay
($1.52 each including freight from Hong Kong to Australia!). These are
branded Leivin and the PCB layout and circuit is as per the National
Semi datasheet. A preliminary test with a 1A load showed a very noisy
output on the CRO. When time permits I'll try the NS recommendation of
an LC filter in the output. I think the device has potential but not
"off the shelf" for running the RPi.

Ray vk2tv

On 05/04/13 00:58, Roger Elmore wrote:

Charles wrote:
I am looking at another device to replace the converter because
this device is not adjustable and is set for 5 V. I need to
increase that to 5.25 to compensate for the drop across the
polyfuse.
I've begun collecting the parts for a pair of PI+TNC-PI combos (for an
APRX digi/IGate and a Linux RMS Gateway) in a rack mount case powered
from the same Astron RS-50M as the two radios and going to give the $7
LM2596 module (bought from Amazon) a try. 3-40V in and 1.5-35V out at
3A. My plan is to use a separate LM2596 fused at 1A for each PI's
input, with a 6A rear panel accessible fuse common to the 13.8V input
of each LM2596 and a 80mm fan. Here goes nothing...

On a different note, has anyone experimented with light pipes to bring
the PI's LED status to the front panel of a chassis? I've used the
Bivar SLP3-450-100-F on a NHRC Micro repeater controller previously
but the LEDs on the PI are too close together for those. I was looking
at the flexible Bivar LC-2.0 at the Mouser website and was wondering
if those might work. Any input from anyone?
--
Roger KJ4AJP



Re: Powering the Raspberry & TNC.

Stephen <squirrox@...>
 

Roger,

I use the same module, but I clean up the output by passing it through a LM2940 3 leg 5 volt LDO regulator (with the caps each side as you would use for a standard application). I don't have any objective measurements but the data sheet quotes an output noise voltage of 150 uV. The whole lot fits into an altoids tin.

Hope this helps,

Steve G0XAR

--- In Raspberry_Pi_4-Ham_RADIO@yahoogroups.com, Ian Bennett <ibennett@...> wrote:

Hi Ray,
I think I have the same type and managed about 2A (ish) output at 5V
with very respectable ripple (read: hardly noticeable on the cro). I was
a little disappointed seeing the output at 4.85V but was withing spec.
I have been bitten a few times because I didn't read the data sheet
correctly, so I read the thing many many times whilst waiting for mine
to arrive.
The one thing (ok, there was two) that stuck in my mind was the use of
low leakage electros and the low loss "tracks" required )shown in bold
in the recommended circuit).
I built mine on vero board and the the low loss connections were
constructed using additional tinned copper wire following the copper and
a heap of solder to fill the gaps. If nothing else, it won't blow away
in the wind ;-)
My coil came out of a few trashed UPS'. I was ratting them for the
toroids but luckily I kept a few intact.

Ian


On 05/04/13 08:51, Ray Wells wrote:


I bought 5, smps adjustable output modules using the LM2596 from Ebay
($1.52 each including freight from Hong Kong to Australia!). These are
branded Leivin and the PCB layout and circuit is as per the National
Semi datasheet. A preliminary test with a 1A load showed a very noisy
output on the CRO. When time permits I'll try the NS recommendation of
an LC filter in the output. I think the device has potential but not
"off the shelf" for running the RPi.

Ray vk2tv

On 05/04/13 00:58, Roger Elmore wrote:

Charles wrote:
I am looking at another device to replace the converter because
this device is not adjustable and is set for 5 V. I need to
increase that to 5.25 to compensate for the drop across the
polyfuse.
I've begun collecting the parts for a pair of PI+TNC-PI combos (for an
APRX digi/IGate and a Linux RMS Gateway) in a rack mount case powered
from the same Astron RS-50M as the two radios and going to give the $7
LM2596 module (bought from Amazon) a try. 3-40V in and 1.5-35V out at
3A. My plan is to use a separate LM2596 fused at 1A for each PI's
input, with a 6A rear panel accessible fuse common to the 13.8V input
of each LM2596 and a 80mm fan. Here goes nothing...

On a different note, has anyone experimented with light pipes to bring
the PI's LED status to the front panel of a chassis? I've used the
Bivar SLP3-450-100-F on a NHRC Micro repeater controller previously
but the LEDs on the PI are too close together for those. I was looking
at the flexible Bivar LC-2.0 at the Mouser website and was wondering
if those might work. Any input from anyone?
--
Roger KJ4AJP



Re: Powering the Raspberry & TNC.

Ian Bennett <ibennett@...>
 

Hi Ray,
I think I have the same type and managed about 2A (ish) output at 5V with very respectable ripple (read: hardly noticeable on the cro). I was a little disappointed seeing the output at 4.85V but was withing spec.
I have been bitten a few times because I didn't read the data sheet correctly, so I read the thing many many times whilst waiting for mine to arrive.
The one thing (ok, there was two) that stuck in my mind was the use of low leakage electros and the low loss "tracks" required )shown in bold in the recommended circuit).
I built mine on vero board and the the low loss connections were constructed using additional tinned copper wire following the copper and a heap of solder to fill the gaps. If nothing else, it won't blow away in the wind ;-)
My coil came out of a few trashed UPS'. I was ratting them for the toroids but luckily I kept a few intact.

Ian

On 05/04/13 08:51, Ray Wells wrote:


I bought 5, smps adjustable output modules using the LM2596 from Ebay
($1.52 each including freight from Hong Kong to Australia!). These are
branded Leivin and the PCB layout and circuit is as per the National
Semi datasheet. A preliminary test with a 1A load showed a very noisy
output on the CRO. When time permits I'll try the NS recommendation of
an LC filter in the output. I think the device has potential but not
"off the shelf" for running the RPi.

Ray vk2tv

On 05/04/13 00:58, Roger Elmore wrote:

Charles wrote:
I am looking at another device to replace the converter because
this device is not adjustable and is set for 5 V. I need to
increase that to 5.25 to compensate for the drop across the
polyfuse.
I've begun collecting the parts for a pair of PI+TNC-PI combos (for an
APRX digi/IGate and a Linux RMS Gateway) in a rack mount case powered
from the same Astron RS-50M as the two radios and going to give the $7
LM2596 module (bought from Amazon) a try. 3-40V in and 1.5-35V out at
3A. My plan is to use a separate LM2596 fused at 1A for each PI's
input, with a 6A rear panel accessible fuse common to the 13.8V input
of each LM2596 and a 80mm fan. Here goes nothing...

On a different note, has anyone experimented with light pipes to bring
the PI's LED status to the front panel of a chassis? I've used the
Bivar SLP3-450-100-F on a NHRC Micro repeater controller previously
but the LEDs on the PI are too close together for those. I was looking
at the flexible Bivar LC-2.0 at the Mouser website and was wondering
if those might work. Any input from anyone?
--
Roger KJ4AJP



Re: Powering the Raspberry & TNC.

Ronny Julian <k4rjjradio@...>
 

Charles this is just a better 7805 right?  I got two.  What fuse type and value are you using on yours?

Ronny
K4RJJ



On Mon, Apr 1, 2013 at 2:15 PM, Charles <k4gbb1@...> wrote:
 

For those who plan to power the Raspberry, TNC and radio package from a 12VDC source.....
Here is the DC to DC converter that I have been using since July of last year w/o an problems. The 1.5 A output is more than enough to supply the TNC-Pi and Raspberry.

This little inexpensive device was $4.30 plus shipping:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=811-2196-5-ND

<>
k4gbb



Re: Powering the Raspberry & TNC.

Ray Wells
 

I bought 5, smps adjustable output modules using the LM2596 from Ebay ($1.52 each including freight from Hong Kong to Australia!). These are branded Leivin and the PCB layout and circuit is as per the National Semi datasheet. A preliminary test with a 1A load showed a very noisy output on the CRO. When time permits I'll try the NS recommendation of an LC filter in the output. I think the device has potential but not "off the shelf" for running the RPi.

Ray vk2tv

On 05/04/13 00:58, Roger Elmore wrote:
 

Charles wrote:
> I am looking at another device to replace the converter because
> this device is not adjustable and is set for 5 V. I need to
> increase that to 5.25 to compensate for the drop across the
> polyfuse.

I've begun collecting the parts for a pair of PI+TNC-PI combos (for an APRX digi/IGate and a Linux RMS Gateway) in a rack mount case powered from the same Astron RS-50M as the two radios and going to give the $7 LM2596 module (bought from Amazon) a try. 3-40V in and 1.5-35V out at 3A. My plan is to use a separate LM2596 fused at 1A for each PI's input, with a 6A rear panel accessible fuse common to the 13.8V input of each LM2596 and a 80mm fan. Here goes nothing...

On a different note, has anyone experimented with light pipes to bring the PI's LED status to the front panel of a chassis? I've used the Bivar SLP3-450-100-F on a NHRC Micro repeater controller previously but the LEDs on the PI are too close together for those. I was looking at the flexible Bivar LC-2.0 at the Mouser website and was wondering if those might work. Any input from anyone?
--
Roger KJ4AJP



Re: Light Pipes (was: Re: Powering the Raspberry & TNC)

Roger Elmore
 

That seems to be the concept of the LC-2.0, but it has a 1mm fiber rather than a MM's 62.5um so it's 16 times the diameter for more light output. And since the panel side already has a lens, at less than a dollar each it would be worth not having to take a Dremel cutting wheel to the ends of LEDs to glue them to the fiber. I bit the bullet and have 15 LC-2.0 Bivar's on the way, it won't be the first time I've put something in the spare parts box that didn't work out.

But the Bivar's spec sheet doesn't show how the other side is terminated (if at all), so it looks like I may still be measuring, milling and drilling some kind of shroud to hold the ends over the LEDs on the PI. Sure would be nice if someone had something folks could buy off-the shelf...
--
Roger KJ4AJP

How about some old MM fiber patch cable (no ends) and shave the
tops off of some panel leds to scatter the light? Not very
modular, down and dirty.

Matt - N0GIK


On a different note, has anyone experimented with light pipes
to bring
the PI's LED status to the front panel of a chassis? I've used
the
Bivar SLP3-450-100-F on a NHRC Micro repeater controller
previously
but the LEDs on the PI are too close together for those. I was
looking at the flexible Bivar LC-2.0 at the Mouser website and
was wondering if those might work.
Any input from anyone?
--
Roger KJ4AJP


Re: Another alternaive to linix?

Ken
 

seems to me that the whole purpose of Pi is to be a reasonably priced learning tool.
Linux isn't the easiest which I can well understand since we have all been dumbed down by iPads(iOSs) and WinDoze.
perhaps a good tutorial for Linux might be of help.
Just my 2 cents worth ...

--- In Raspberry_Pi_4-Ham_RADIO@yahoogroups.com, "Rick Simpson" <goatguy101@...> wrote:

Why not just give Kerry an SD card with a working version of ax25 and whatever else he needs. Then he can just plug it in and fire up his system I'm sure he would pay the modest cost of the SD card to get a working setup!

Rick
----- Original Message -----
From: Ray Wells
To: Raspberry_Pi_4-Ham_RADIO@yahoogroups.com
Cc: vk4tub
Sent: Sunday, March 31, 2013 5:02 PM
Subject: Re: [Raspberry_Pi_4-Ham_RADIO] Another alternaive to linix?




Kerry,

The fact that many have fbb working on the Pi must surely suggest you are missing something or you are doing something wrong. Your statement that ax25 tools won't install further suggests you are missing something or you are doing something wrong. Did you install from deb (repository) packages or did you compile from sources. I've had no difficulty compiling kernel ax25 on the Pi - libax25, ax25-tools and ax25-apps - running Raspbian kernel. I've had no need for fbb since I closed my BBS (linfbb) about four years ago so haven't tried to get it to work on the Pi. Have you subscribed to the linfbb mailing list for fbb specific help? The list is active.

Ask specific questions, provide error messages and, you'll probably get the help you need. Get kernel ax25 working before you attempt to get fbb working.

BTW, DOS was stolen from Unix, and stuffed up in the process.

Ray vk2tv


On 31/03/13 20:12, vk4tub wrote:


Greetings to all

to be blunt I am totally over Linux and have wasted much time on trying to make it work with fbb. Many hams have it working and regardless of my typing the exact some commands as they do it doesn't work. I have reinstalled the pi version of Linux 6 times today and configured it up with out a problem however the one program that I want to run will not nor will the ax25 tools install on my pi for whatever reason.
I have also built several tncpis to go with the two units I have here but am dead in the water because I cannot get even one raspberry working.

So before I ditch this project into the trash can is there another operating system available such as Dos that will at least have logical paths etc that a Dos based person like myself can understand.

Linux has totally confused me to the point where I have had enough.

kind regards Kerry VK4TUB


Re: Powering the Raspberry & TNC.

n0gik@...
 

How about some old MM fiber patch cable (no ends) and shave the tops off of some panel leds to scatter the light? Not very modular, down and dirty.

Matt - N0GIK


On a different note, has anyone experimented with light pipes to bring the PI's LED status to the front panel of a chassis? I've used the Bivar SLP3-450-100-F on a NHRC Micro repeater controller previously but the LEDs on the PI are too close together for those. I was looking at the flexible Bivar LC-2.0 at the Mouser website and was wondering if those might work. Any input from anyone?
--
Roger KJ4AJP


------------------------------------

Yahoo! Groups Links



Re: Powering the Raspberry & TNC.

Roger Elmore
 

Charles wrote:
I am looking at another device to replace the converter because
this device is not adjustable and is set for 5 V. I need to
increase that to 5.25 to compensate for the drop across the
polyfuse.
I've begun collecting the parts for a pair of PI+TNC-PI combos (for an APRX digi/IGate and a Linux RMS Gateway) in a rack mount case powered from the same Astron RS-50M as the two radios and going to give the $7 LM2596 module (bought from Amazon) a try. 3-40V in and 1.5-35V out at 3A. My plan is to use a separate LM2596 fused at 1A for each PI's input, with a 6A rear panel accessible fuse common to the 13.8V input of each LM2596 and a 80mm fan. Here goes nothing...

On a different note, has anyone experimented with light pipes to bring the PI's LED status to the front panel of a chassis? I've used the Bivar SLP3-450-100-F on a NHRC Micro repeater controller previously but the LEDs on the PI are too close together for those. I was looking at the flexible Bivar LC-2.0 at the Mouser website and was wondering if those might work. Any input from anyone?
--
Roger KJ4AJP

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