Date   
Re: Making front panel labels

Jose Silva
 

Fantastic Dan, congratulations!.

73
Saulo
PY7EG

2018-03-28 13:26 GMT-03:00 Daniel Conklin <danconklin2@...>:

I printed mine out on with an inkjet printer on regular photo paper and then put some clear tape over it to preserve it.
Dan, W2DLC


Re: messages from group...

Ghericoan
 

If you're using gmail,  the spam filter has recently taken a disliking to groups.io for me,  so that could be causing your trouble. 


On Wed, Mar 28, 2018, 12:55 PM AA9GG <paul.aa9gg@...> wrote:
For some reason I have not been getting any message from the group in my email.  I just checked my settings and all seems to be correct.  What happened???


--
----------
N5WLF, Greggory (or my nickname, Ghericoan)
General Class, Digital Radio Hobbyist

Re: Source of small gauge shielded audio wire for a filter #ubitx

AA9GG
 

I use ethernet wire for breadboarding.

Re: Source of small gauge shielded audio wire for a filter #ubitx

AA9GG
 

some of those headphones use litz wire....

messages from group...

AA9GG
 

For some reason I have not been getting any message from the group in my email.  I just checked my settings and all seems to be correct.  What happened???

Re: Ubitx sticks on transmit

Karl Heinz Kremer, K5KHK
 

You mentioned Winlink, so I assume you are using CAT control. Every time I've experienced this when using CAT, it was caused by RF getting into something. With my setup, whenever I run more than 2W on 30m I am ending up with TX not getting turned off. For other bands, the limits are a bit higher. I've added chokes to the USB cable from the computer to the serial adapter, and another one on the cable from the serial adapter to the radio, but so far this has not made any difference. I'll probably add a few more chokes on power supply and audio cables to see if I can fix this. 

You may want to try turning down TX power to see if that makes a difference. 
--
Karl Heinz - K5KHK

Re: Ubitx sticks on transmit

Jerry Gaffke
 

The PTT pin at A3 of the Nano should go from zero volts DC during transmit to up around 5v during receive.
Does it?

If it is around 5v and still transmitting, what firmware are you using?  Version?
Maybe hack the firmware sketch to continuously report the state of the PTT pin out the UART debug port to the host:
  http://www.instructables.com/id/HOW-TO-use-the-ARDUINO-SERIAL-MONITOR/

If it's not something shorting PTT to ground during receive, and if the firmware is correct,
could be that the IO cell for pin A3 of your Nano got blown.

Jerry
 

On Wed, Mar 28, 2018 at 10:19 am, Scott Docter wrote:
My ubitx will frequently stay in transmit. The only way to get it out is to transmit another time and return it to normal. Sometimes it takes several transmissions to get it back to receive. 
 
In the video linked at the end of this email I am using Winlink. At about 20 second into the video you can hear that it doesn't click out of transmit and see it on the swr meter. The next transmit from Winlink returns it to normal but it happens again. 
 
When it sticks in transmit I don't know where it is transmitting but the swr goes way up so it must not be on the same frequency as it is set to. 
 
Any ideas about what might be going on?
 
 
Thanks, Scott 
KC8IFH

Re: Ubitx sticks on transmit

Clark Martin
 

I would look at the PTT signal.  If it is stuck on then the problem is in either the PTT hardware or software.

Clark Martin
KK6ISP

On Mar 28, 2018, at 10:19 AM, Scott Docter <scott.docter@...> wrote:

My ubitx will frequently stay in transmit. The only way to get it out is to transmit another time and return it to normal. Sometimes it takes several transmissions to get it back to receive. 

In the video linked at the end of this email I am using Winlink. At about 20 second into the video you can hear that it doesn't click out of transmit and see it on the swr meter. The next transmit from Winlink returns it to normal but it happens again. 

When it sticks in transmit I don't know where it is transmitting but the swr goes way up so it must not be on the same frequency as it is set to. 

Any ideas about what might be going on?

Ubitx sticks on transmit

Scott Docter
 

My ubitx will frequently stay in transmit. The only way to get it out is to transmit another time and return it to normal. Sometimes it takes several transmissions to get it back to receive. 

In the video linked at the end of this email I am using Winlink. At about 20 second into the video you can hear that it doesn't click out of transmit and see it on the swr meter. The next transmit from Winlink returns it to normal but it happens again. 

When it sticks in transmit I don't know where it is transmitting but the swr goes way up so it must not be on the same frequency as it is set to. 

Any ideas about what might be going on?


Thanks, Scott 
KC8IFH

Re: Bitx20 I have completed the RF section and now doing the current test on transmit and recieve. #bitx20help

Jerry Gaffke
 

Most of us in the forum have the rigs from hfsignals.com
Do you have one of these from Sunil?
    https://app.box.com/s/6g5rj15kgpft1mqxkg7h/file/16782106213
Most of us have no idea what transmit current into the exciter should be on Sunil's board set.
I suspect Ashhar does not either.

Anyway, my guess would be that current increase when going to transmit on that exciter would mostly be around Q14.
I suggest you measure DC voltages at Q14's emitter, base and collector for transmit and receive.
Should be around zero for receive, well above ground for transmit.

Also, if you want to keep an intelligent conversation going on this, don't change the subject heading.
Took me a few minutes to find your old thread where the problem was described.

Jerry

################

Arv Evans
9:08 am   

 

Shytron

In order to provide help we would need to know a bit more about your problem.
  • Which model BITX do you have?

  • What test equipment do you have available?

  • What are the symptoms of the problem?

  • How far have you already gone with testing?
The group is usually quite helpful but "something is broken" is just too little 
information to work with.

Arv  K7HKL
_._

 

 
. . .

 

On Wed, Mar 28, 2018 at 9:08 AM, shytron via Groups.Io <shytron@...> wrote:
I have a BITX20 with some problems with the current measurements and cant seem to get any help with this group. I would have to say i am very discouraged. Ill just contact Ashar.

Re: Source of small gauge shielded audio wire for a filter #ubitx

Jack, W8TEE
 

Ethernet cable is also good. Unwind the bundle of wires in the cable and then roll each on a flat surface with a 2x4. It will "unkink" and leave you with nice small diameter wires. I think this was Chuck Adams' (K7QO) idea.

Jack, W8TEE


On Wednesday, March 28, 2018, 11:49:46 AM EDT, Jim Strohm <jim.strohm@...> wrote:


I get most of my small diam wire by stripping it out of old TV sets or radios.

Plenty of good stuff if you take the time to look.

73
Jim N6OTQ

Re: Making front panel labels

Daniel Conklin <danconklin2@...>
 

I printed mine out on with an inkjet printer on regular photo paper and then put some clear tape over it to preserve it.
Dan, W2DLC

Re: Disappointing

Arv Evans
 

Shytron

In order to provide help we would need to know a bit more about your problem.
  • Which model BITX do you have?

  • What test equipment do you have available?

  • What are the symptoms of the problem?

  • How far have you already gone with testing?
The group is usually quite helpful but "something is broken" is just too little
information to work with.

Arv  K7HKL
_._



On Wed, Mar 28, 2018 at 9:08 AM, shytron via Groups.Io <shytron@...> wrote:
I have a BITX20 with some problems with the current measurements and cant seem to get any help with this group. I would have to say i am very discouraged. Ill just contact Ashar.


Re: #bitx40 #ubitx #bitx40 #ubitx

Jerry Gaffke
 

A google for "w7zoi hycas" will show a well regarded AGC system.
It gives nearly 60dB of gain when there's no AGC action, about 40 dB more than the uBitx 12mhz IF has.
Lots of parts, but most are under a nickle.
Could be a $10 board if autostuffed with surface mount parts.

Henning mentions possible trouble due to filter delays if the AGC attenuator/gain-control is prior
to the the IF filter and the AGC detector is after the the filter, something to be aware of:
    https://groups.io/g/BITX20/message/32090 
Don's audio detect + FET rf attenuator is apparently not suffering any instability from this.

I have no idea what Bill is doing, but if he plans to have an AGC detector before the 12mhz filter
it will be interesting to see how he goes about making that work.

I'm still thinking a PIN diode bridge in one of the IF amps as the attenuator plus an audio based AGC detector.
Simple enough, and the uBitx doesn't need any more gain.

Jerry

Re: Source of small gauge shielded audio wire for a filter #ubitx

Jim Strohm
 

I get most of my small diam wire by stripping it out of old TV sets or radios.

Plenty of good stuff if you take the time to look.

73
Jim N6OTQ

Re: SUCCESS, uBITX pop reduction with ONE added component

Michael Hagen
 

I heard it called " it is a new Feature"!


Mike, WA6ISP


On 3/28/2018 6:34 AM, Kai Nilakari wrote:
Sorry, OM. I didn't notice anything after installing this smd part. Still a pop when starting and finishing tx, but I'll get used to it.
As Microsoft states "Windows have no bugs, they're properties".

Kai, OH3WE

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

Re: #bitx40 #ubitx #bitx40 #ubitx

Tim Gorman
 

Oops! Forgot the attachment!

tim ab0wr

On Wed, 28 Mar 2018 10:08:24 -0500
"Tim Gorman" <tgorman2@...> wrote:

Jerry,

Been going back thru my old notes. Attached is a schematic of an agc
amp I used on a single conversion receiver I built back in 2008. It
even provides for an S-meter. The AGC was designed to work with an
MC1550 IF Amp IC but I don't see why it couldn't be used to drive a
2n7002 as well. Might have to change values to provide the right gate
voltage, I'll have to do some calculations.

tim ab0wr

On Tue, 27 Mar 2018 18:40:29 -0700
"Jerry Gaffke via Groups.Io" <jgaffke=yahoo.com@groups.io> wrote:

Detecting RF for AGC would have to happen after the 12mhz crystal
filter.
Not really… it can happen anywhere in the chain.  The issue is the
bandwidth of:
  1) the attenuator and 2) the detector used for the AGC. 
  With the right parts, anything is possible.
AGC should detect what's in the passband of the receiver, nothing
more, nothing less. If RF into the AGC detector is wider, then any
QRO signal in the band will quiet the receiver. I can vaguely
imagine ways to make it work with the AGC detector in front of the
IF filter, but they aren't pretty.   I'm fine with just detecting
the audio on a $109 transceiver.

Let us know how your AGC scheme works once finished.
Though I'm more in Don's camp, agonizing about whether a $0.50 PIN
diode array is worth the expense when a $0.02 FET is almost good
enough.

Disappointing

shytron
 

I have a BITX20 with some problems with the current measurements and cant seem to get any help with this group. I would have to say i am very discouraged. Ill just contact Ashar.

Re: #bitx40 #ubitx #bitx40 #ubitx

Tim Gorman
 

Jerry,

Been going back thru my old notes. Attached is a schematic of an agc
amp I used on a single conversion receiver I built back in 2008. It
even provides for an S-meter. The AGC was designed to work with an
MC1550 IF Amp IC but I don't see why it couldn't be used to drive a
2n7002 as well. Might have to change values to provide the right gate
voltage, I'll have to do some calculations.

tim ab0wr

On Tue, 27 Mar 2018 18:40:29 -0700
"Jerry Gaffke via Groups.Io" <jgaffke=yahoo.com@groups.io> wrote:

Detecting RF for AGC would have to happen after the 12mhz crystal
filter.
Not really… it can happen anywhere in the chain.  The issue is the
bandwidth of:
  1) the attenuator and 2) the detector used for the AGC. 
  With the right parts, anything is possible.
AGC should detect what's in the passband of the receiver, nothing
more, nothing less. If RF into the AGC detector is wider, then any
QRO signal in the band will quiet the receiver. I can vaguely imagine
ways to make it work with the AGC detector in front of the IF filter,
but they aren't pretty.   I'm fine with just detecting the audio on a
$109 transceiver.

Let us know how your AGC scheme works once finished.
Though I'm more in Don's camp, agonizing about whether a $0.50 PIN
diode array is worth the expense when a $0.02 FET is almost good
enough.

Re: uBitx on teensy with JT/FSQ and WSPR beacons

Arv Evans
 

Tim  AB0WR and Stephen  KD2NDR

An alternative approach for current monitoring might be available.  As part of
a workbench system I built a dual-port DC voltmeter using an Arduino NANO.
By using two ADC inputs I can measure voltage on both ends of a resistor and
the use the NANO software to calculate difference voltage.  This lets me
manually calculate the current from resistance and voltage. 

In a captive system this approach would work because the software would know
the resistance value and thus be able to measure differential voltage and from
that calculate current flow through that known resistance. 

Differential voltage measuring is necessary in cases where both ends of the device
being measured are at some potential above ground, because the Arduino ADC can
only measure relative to a ground reference. 

Arv
_._


On Wed, Mar 28, 2018 at 8:40 AM, Tim Gorman <tgorman2@...> wrote:
If you are going to do a voltage/current monitor you might want to
consider using a 5a hall effect current sensor module. They are only
about $2 on ebay and they work well. I am using one with a beaglebone
black to monitor my backup battery charging current from my solar panel.

You could actually use two, one to monitor main board draw and one to
monitor PA current draw!

tim ab0wr

On Wed, 28 Mar 2018 09:02:30 -0400
"Steve P" <mosteveo@...> wrote:

> I’ve been working on porting the uBitx code to teensy, which now
> works well. In addition I’ve added a few other things with the new
> expanded memory capability.
>
> Changes:
> - I2C 4x20 display, leaving many pins for other uses
> - digital beacon modes supporting all JT modes, WSPR and FSQ;
> transmission is triggered by timer interval set through main menu.
> - setting of teensy real time clock through GPS (will add option to
> set manually and through serial later.
> - dynamic setting of maidenhead locator (4 or 6 character) based on
> GPS
>
> Planned:
> - sd card use to store custom messages and logs for digital mode
> operations.
> - numeric keypad support to enter text and directly enter frequency.
> - voltage/ amp monitor for battery operation.
> - swr meter
> - and more...
>
> I’ll make it publicly available when I get more time to test
> everything more in-depth. I’m very short on time lately though.
>
> Stephen
> KD2NDR
>
>
>