Date   
Re: Type of BS170 MOSFETS. I see on Mouser that there are several additional numbers besides the 170. Some are listed as obsolete, ect.

Graham, VE3GTC
 

besides the obvious difference between the SMD SOT-23-3 version and the TO-92 package, the different Mouser part numbers usually refer to different packaging types.

For example BS170-D75Z is the part available in the "ammo pack" packaging and BS170-D27Z is the part available on "cut tape" packaging, otherwise they are the same part.

Sorry, can't answer your other questions however.

cheers, Graham ve3gtc


On Mon, Mar 16, 2020 at 8:54 PM Craig Johnson <saltcreeke@...> wrote:
I made a mistake ordering a generic synthesizer chip, not a biggy, except waiting for the correct one from Digi-Key.  So now I am a little "gun" shy about ordering a "generic."  
Second question :   what should be the approximate voltage at the BS170 collector?  
Third question:  I  have high voltages on pins 5&6 of IC10  (5.92v) Cause?
Craig

Type of BS170 MOSFETS. I see on Mouser that there are several additional numbers besides the 170. Some are listed as obsolete, ect.

Craig Johnson
 

I made a mistake ordering a generic synthesizer chip, not a biggy, except waiting for the correct one from Digi-Key.  So now I am a little "gun" shy about ordering a "generic."  
Second question :   what should be the approximate voltage at the BS170 collector?  
Third question:  I  have high voltages on pins 5&6 of IC10  (5.92v) Cause?
Craig

Re: Trouble Shoot/Repair

sean
 


Dave,
Not a problem,  let me know what was found. Just curious. 

Be safe
73
De kc2lwx 
Sean

On Mon, Mar 16, 2020 at 9:37 AM, david carlisle
<dwcarlisle@...> wrote:
Sean,

Thank you.  I have an offer to take a look at it, so I'm going to send it.  I can imagine it would be tough to see values with a really good camera!

Dave

Re: Beta CAT using Rel 1.04 for the QCX

J68HZ
 

The LOGGING function is what really sets that thing apart from just a CAT interface.

 

 

Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com

Like us on Facebook! facebook icon

 

Moderator – North American QRO Group at Groups.IO.

 

email:  bill@...

 

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of jjpurdum via Groups.Io
Sent: Monday, March 16, 2020 10:15 AM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] Beta CAT using Rel 1.04 for the QCX

 

I sure wouldn't pay over $200 for something like that. I did mine mainly for two reasons: 1) my eyesight sucks and the larger numbers helps, and 2) sometimes I need to QRQ/QRS and using a menuing system is more difficult and time consuming during a QSO. If I can get the spectrum display to work, that's good enough for me, as I find that invaluable when I'm using low power (if they're loud, I might be, too).  Finally, I'm writing this with an eye towards the QSX, which will have a mountain of memory compared to the ant hill Hans is squeezing things into now. In other words, the CAT parameter list may expand later on, adding more features/utility to the CAT interface.

 

Jack, W8TEE

 

On Monday, March 16, 2020, 11:06:09 AM EDT, Dave New, N8SBE <n8sbe@...> wrote:

 

 

Jack,

 

The feature set you discuss below kind of reminds me of the Key Log Go:

 

 

Although it doesn't sport a waterfall, etc., some of the other features sound familiar.  I've never used one, but I've seen them demonstrated at FDIM vendor night.

 

Anyone here have one?  Is it really useful in the field?  What features would you find useful in Jack's version?

 

73,

 

-- Dave, N8SBE

-------- Original Message --------
Subject: Re: [QRPLabs] Beta CAT using Rel 1.04 for the QCX
From: "jjpurdum via Groups.Io" <jjpurdum@...>
Date: Sun, March 15, 2020 3:07 pm
To: <QRPLabs@groups.io>

Yes, it will be Open Source. The electronics behind it is very simple: a level converter (since some are at 5V and others at 3.3V), a voltage regulator, a socket for the Teensy 4.0 (T4), and a cable to the display. I can probably make a schematic available within a few days. The T4 has a mega-munch of memory, so there are all kinds of things I'd like to try and do, even past the SDR. For example, how about creating a CW decoder and reading your code as you send it during a contest and using the builtin T4 RTC to record the date/time and use the decoder to pull off the call and CAT to record the frequency and then write it to a CSV file for later processing "when you get home"? There's all kinds of neat stuff that might be tried.

 

Jack, W8TEE

 

On Sunday, March 15, 2020, 2:12:24 PM EDT, Charles Wells <odu1993@...> wrote:

 

 

Just watched the video.  What a fascinating, wonderful piece of gear. 

 

I've toyed with the idea of using a Pi in the field for logging and control, but I like your implementation.

 

Will you be making this available as a project to build?

 

thanks

Chas

 

On Sun, Mar 15, 2020 at 1:05 PM jjpurdum via Groups.Io <jjpurdum=yahoo.com@groups.io> wrote:

Try the link again...it should be viewable now.

 

Jack, W8TEE

 

On Sunday, March 15, 2020, 12:43:21 PM EDT, Troy - K4JDA <troy.davis@...> wrote:

 

 

Jack, when I try to view the video, I get “Video is Private” ... anxious to see it!


Virus-free. www.avg.com

Re: Beta CAT using Rel 1.04 for the QCX

jjpurdum
 

I sure wouldn't pay over $200 for something like that. I did mine mainly for two reasons: 1) my eyesight sucks and the larger numbers helps, and 2) sometimes I need to QRQ/QRS and using a menuing system is more difficult and time consuming during a QSO. If I can get the spectrum display to work, that's good enough for me, as I find that invaluable when I'm using low power (if they're loud, I might be, too).  Finally, I'm writing this with an eye towards the QSX, which will have a mountain of memory compared to the ant hill Hans is squeezing things into now. In other words, the CAT parameter list may expand later on, adding more features/utility to the CAT interface.

Jack, W8TEE

On Monday, March 16, 2020, 11:06:09 AM EDT, Dave New, N8SBE <n8sbe@...> wrote:


Jack,

The feature set you discuss below kind of reminds me of the Key Log Go:


Although it doesn't sport a waterfall, etc., some of the other features sound familiar.  I've never used one, but I've seen them demonstrated at FDIM vendor night.

Anyone here have one?  Is it really useful in the field?  What features would you find useful in Jack's version?

73,

-- Dave, N8SBE
-------- Original Message --------
Subject: Re: [QRPLabs] Beta CAT using Rel 1.04 for the QCX
From: "jjpurdum via Groups.Io" <jjpurdum@...>
Date: Sun, March 15, 2020 3:07 pm
To: <QRPLabs@groups.io>

Yes, it will be Open Source. The electronics behind it is very simple: a level converter (since some are at 5V and others at 3.3V), a voltage regulator, a socket for the Teensy 4.0 (T4), and a cable to the display. I can probably make a schematic available within a few days. The T4 has a mega-munch of memory, so there are all kinds of things I'd like to try and do, even past the SDR. For example, how about creating a CW decoder and reading your code as you send it during a contest and using the builtin T4 RTC to record the date/time and use the decoder to pull off the call and CAT to record the frequency and then write it to a CSV file for later processing "when you get home"? There's all kinds of neat stuff that might be tried.

Jack, W8TEE

On Sunday, March 15, 2020, 2:12:24 PM EDT, Charles Wells <odu1993@...> wrote:


Just watched the video.  What a fascinating, wonderful piece of gear. 

I've toyed with the idea of using a Pi in the field for logging and control, but I like your implementation.

Will you be making this available as a project to build?

thanks
Chas

On Sun, Mar 15, 2020 at 1:05 PM jjpurdum via Groups.Io <jjpurdum=yahoo.com@groups.io> wrote:
Try the link again...it should be viewable now.

Jack, W8TEE

On Sunday, March 15, 2020, 12:43:21 PM EDT, Troy - K4JDA <troy.davis@...> wrote:


Jack, when I try to view the video, I get “Video is Private” ... anxious to see it!

Re: Beta CAT using Rel 1.04 for the QCX

Dave New, N8SBE
 

Jack,

The feature set you discuss below kind of reminds me of the Key Log Go:


Although it doesn't sport a waterfall, etc., some of the other features sound familiar.  I've never used one, but I've seen them demonstrated at FDIM vendor night.

Anyone here have one?  Is it really useful in the field?  What features would you find useful in Jack's version?

73,

-- Dave, N8SBE

-------- Original Message --------
Subject: Re: [QRPLabs] Beta CAT using Rel 1.04 for the QCX
From: "jjpurdum via Groups.Io" <jjpurdum@...>
Date: Sun, March 15, 2020 3:07 pm
To: <QRPLabs@groups.io>

Yes, it will be Open Source. The electronics behind it is very simple: a level converter (since some are at 5V and others at 3.3V), a voltage regulator, a socket for the Teensy 4.0 (T4), and a cable to the display. I can probably make a schematic available within a few days. The T4 has a mega-munch of memory, so there are all kinds of things I'd like to try and do, even past the SDR. For example, how about creating a CW decoder and reading your code as you send it during a contest and using the builtin T4 RTC to record the date/time and use the decoder to pull off the call and CAT to record the frequency and then write it to a CSV file for later processing "when you get home"? There's all kinds of neat stuff that might be tried.

Jack, W8TEE

On Sunday, March 15, 2020, 2:12:24 PM EDT, Charles Wells <odu1993@...> wrote:


Just watched the video.  What a fascinating, wonderful piece of gear. 

I've toyed with the idea of using a Pi in the field for logging and control, but I like your implementation.

Will you be making this available as a project to build?

thanks
Chas

On Sun, Mar 15, 2020 at 1:05 PM jjpurdum via Groups.Io <jjpurdum=yahoo.com@groups.io> wrote:
Try the link again...it should be viewable now.

Jack, W8TEE

On Sunday, March 15, 2020, 12:43:21 PM EDT, Troy - K4JDA <troy.davis@...> wrote:


Jack, when I try to view the video, I get “Video is Private” ... anxious to see it!

Re: Trouble Shoot/Repair

david carlisle
 

Sean,

Thank you.  I have an offer to take a look at it, so I'm going to send it.  I can imagine it would be tough to see values with a really good camera!

Dave

SVHFS 2020 Conference Postponed Indefinitely

Robin Midgett
 

Because of the health and safety concern of our society members and the uncertainty of time of our National Emergency caused by the Corona virus pandemic, the Society’s Board of Directors elected to postpone this year’s conference indefinitely. The Board of Directors will be discussing alternate solutions for this year’s conference including the determination of registrations and the publishing of this year’s proceedings. The outcome of the Board’s decisions will be posted as soon as a determination has been made. For now, please stay healthy and safe, and enjoy our wonderful hobby.  

 

SVHFS Board of Directors



On Wed, Mar 11, 2020 at 7:56 PM K4IDC@... <robink4idc@...> wrote:
SVHFS Conference 2020 Registration...The Clock Is Ticking


Pre-registration is open through April 15, 2020. Please use the registration form on the conference web page here.

 

The 2020 Southeastern VHF Society Conference will be held in Gainesville, Georgia on April 24-25, 2020. Gainesville, GA is approximately 60 miles north of Atlanta in EM84ch. It is about 1.5 miles from I-985. 

The Ramada Inn, of Gainesville, Georgia is the conference hotel for the 2020 SVHFS Conference. The hotel is now taking reservations directly. To book your room, please see the conference page or follow this information:

The conference rate is $80 per night. To secure this rate, call the hotel directly at 770-531-0907. Do not call Ramada central reservations or book through the Ramada Website.

 

Ramada Inn

400 E.E. Butler Parkway

Gainesville, GA 30501

770-531-0907

N34.297420 / W083.8222475 – Google Maps link


Thanks,
Robin Midgett K4IDC

About adding the CAT circuit

Hidehiko Komachi - JA9MAT
 

Hello,

Well I've updated my QCX40 to the latest version of firmware - 1.04 successfully.
But I wonder about how to modify my QCX's hardware. I bought it on Oct.2017 so my QCX seems to have a early version of the PCB.

I've also read Version5 manual and I can see the hardware of CAT of it.
It seems OK that R49,R50 and D6 should be added according to the schematic.

Is there any other thing to do for the early version of QCX?
Any suggestions welcome.

Hidehiko. ja9mat

Re: Trouble Shoot/Repair

sean
 

Dave possible to take some close up shots of the unit and email them to me. Perhaps I can see something?
Values correct? 470k verses 470 ohms

I had a similar issue with QCX20. 
incorrect value was in the kit.
After changing the value I was able to get the unit working. 

Sean
Kc2lwx 



On Mon, Mar 16, 2020 at 5:44 AM, david carlisle
<dwcarlisle@...> wrote:
Dear QCX10 users,

Is there someone who can troubleshoot/repair my QCX10 in the US?  I have built two, and had no luck with either.  Almost everything is working, it seems, and I've been through the QCX degugging video and used both a DVM and the recommended oscilloscope, and I can trace the 700mhz signal through to IC10, but there is still no sound at the output/earphone for adjust 8.8,8.9, etc., so nothing registers and turning the screws does nothing.  I have squinted as much as possible, and I'm not sure how to find the short/broken trace, bad solder, etc.  So, if you would be willing to take a look at it, I would appreciate it.

Dave
KCPKB
73

Re: 10MHz QCX Filtering

Adrian Rees (M1LCR)
 

Hi all

I have modified the LPF in my 10MHz / 30m QCX which I want to use as a transverter driver for the LF & VLF bands.

Essentially I changed the LPF  higher in frequency. My calculated values for C27 & C28 were 230pF and C25 & C26 was 500pF . The values I installed, as below, was governed by my junk box . Near enough anyway. The inductor changes were also minor and I only changed L1 & L3.The changes are as follows:

L1 & L3 changed to 18 Turns each (remove 1 turn each)

L2 no changes (20 Turns)

C27 & C28 changed to 220pF

C25 & C26 changed to 510pF

I measured the resultant filter in situ with my VNA. This has resulted in a distinct "hump" between 10 and 11MHz with the LPF starting to roll off at just over 11MHz. I guess the hump is a result of leaving L2 as-is. This is a good result for my purposes.


Adrian

M1LCR

On 15/03/2020 21:57, wb8yyy via Groups.Io wrote:
nice work Jim -- I also see data here --

https://qrp-labs.com/lpfkit

I think these filters may be crafted based upon the G-QRP low pass filters - I remember seeing those documented somewhere on the web at one time. 

Adrian i imagine many will be interested in your transverter results - possibly you might not want the PA devices in the QCX for that application (to avoid the hefty attenuator). 

73 curt

Re: QCX Firmware 1.04 released

Wolfgang DK4RW
 

Hans,

With CAT control you enabled the AX command for writing to LCD pins. These outputs are perfect for switching low pass filters in a multi-band QCX.

For band switching without a CAT control device connected it would be very useful if the output pins could be set manually. For instance the output pin state could be an additional numerical parameter in the frequency preset menu (Preset 5), similar to the U3S band control.

I would very much appreciate if you could consider an addition to a future QCX firmware release. But I very well understand you probably have other priorities right now.

Thank you.

73 Wolfgang DK4RW

Re: Ultimate3S Newbie- Power Not Adjustable

M0RON
 

Hi Jerry,
with one bs170 at 5v you should be seeing just over 100mA on idle and 200 ish mA on tx. 
Have you set the pa as stated in booklet? Also I think you may be confusing what the information on the menu screens mean. In cw the db on screen should be 00, in wspr mode however it's different. There the db number is entered as your power output in dbm, be aware only certain numbers are acceptable otherwise you will get an error message. 
Read the operating manual. 
Andy
--
The universe is made up of Protons, Neutrons, Electrons but contains only one M0RON.

Re: Ultimate3S Newbie- Power Not Adjustable

KEN G4APB
 

Hi Jerry,
the rf output power is not adjustable. You say ...fixed at 28 dBm regardless of the setting on the mode screen, but what screen are you looking at?

If you are looking at a wspr setting then the power level displayed is what you have to set manually after measuring it.

73 Ken g4apb

Ultimate3S Newbie- Power Not Adjustable

jsternmd
 

I bought the U3S v 3.12 a few years ago but only got around to building it a few days ago.  It only has one BS170 and I am running it at 5.0v from an accurate lab bench supply.  Everything seems to work fine but the output power in CW or FSK seems to be fixed at 28 dBm regardless of the setting on the mode screen (on 7.15 and 14.15 MHz).  I have only built LPF for 40m and 20m but I have a high confidence in the power measurement accuracy based on the U3S connected directly to my calibrated spectrum analyzer (via 40 dB of precision attenuation) using slow CW/FSK msgs so that the signal can be observed on the analyzer.  Interestingly, at 28 dBm output the supply reads about 270mA but in idle/menu mode no signal it jumps up to 350mA.  The signal BTW looks pretty clean though I have not done any extensive evaluation. 

Thanks

Jerry NY2KW

Re: QCX40 Hum on Transmit

ajparent1/KB1GMX
 

Magnetic field from a transformer.

Hum injected from the key or other interfaces.
ground loop.

Jitter/hash, is there noise on the 5V line or the 3.3V line?
IF your not tuning and seeing that do you have a uncommanded
update like noise on the encoder leads?

Allison
-------------------------------
Please reply on list so we can share.
No direct email, it goes to bit bucket due address harvesting in groups.IO

Re: Power supply for Raspberry PI

ajparent1/KB1GMX
 

If the weather was dry the thing that can zap a controller is the tip of
your finger, ESD, Aa carpet static.

Never had a 7805 series chip cause a failure do to over voltage.

Allison
-------------------------------
Please reply on list so we can share.
No direct email, it goes to bit bucket due address harvesting in groups.IO

Re: Power supply for Raspberry PI

@CurtisM
 

I am thinking that for a stock U3S without QRO, that a walwart with sufficient voltage and current could feed suitable regulation and capacitive filtering - and is a more reasonable solution than starting with 12 or 13.8 volts.  I just happened to have a 5 volt linear supply that someone had homebrewed.  I did try a 7805 once, with filtering caps - and even though its steady-state voltage was confirmed to be 5 volts - somehow zapped my U3S controller - I have no clue why.  So I would vet your solution with some turn-on operations with some less-vital hardware. 

73 curt

Re: QCX40 Hum on Transmit

Mike Besemer - WM4B
 

Also, I find it really odd that with the battery, it exhibits the EXACT same behavior as on the switcher.  And contrary to my original post, I suspect that hum is also present on the RX side, but it's covered by white noise.  I do see some jitter/hash on the clock outputs of the synth.

Mike
WM4B

Re: QCX40 Hum on Transmit

Mike Besemer - WM4B
 

Hi Bill,

I thought of that, but I had the RF gain fully down on the shack radio and the QCX was coupled into a good quality dummy load and about 150' away.  The main signal on the waterfall was about +2 dB and the 120 Hz lines fell off from there with the first one (in both above and below) at about -20 dB.  I may still be overloading, but I don't think that's the case.  

Nontheless, I'm keeping it in the back of my mind.

73,

Mike
WM4B