Date   

Re: ProgRock serial interface

Syd
 

Thanks, that's what I did. Good to know anyway.
syd/wt1v


Re: QCX Mini for 17M - usability on 20M & 15M? #qcxmini

David Feldman
 

If some person with 17M QCX MINI wishes to perform experiment and consider result, that will be helpful!

I think three basic parameters of interest:

1. Receive MDS (minimum detectable signal)
2. Transmit spectral purity (harmonics and possible other spurious output)
3. DC power consumption during transmit (to see if thermal artifact in final amplifier stage due to efficiency change)

Approximate frequency ratio 18.1/14.0 = 29%, 21.0/18.1 = 16%

I do not expect optimization of performance, just curious circuit survivability and basic usability at reduced specification (=better than carry 3 radios!)

73 Dave WB0GAZ wb0gaz@yahoo.com


Re: QCX Challenge - June 2021

John Pagett G4YTJ
 

I hope to be on 40m for the 1300z session.
73
John
G4YTJ 

On 27 Jun 2021, at 19:19, ON7DQ Luc <on7dq@...> wrote:

Hi Folks,

Sorry for the late announcement, but I just came home from a short SOTA tour.

Tomorrow is the last monday of June, so it's time for the QCX Challenge, see
http://www.qrp-labs.com/party.html

Not sure if I will be in the 1300Z sesion, but I should be QRV for the 1900Z one.
You all have fun !
 
73,
Luc ON7DQ


Re: QCX Mini for 17M - usability on 20M & 15M? #qcxmini

Curt wb8yyy
 

Dave

If you examine multiband rigs you will see that they employ a low pass filter typically for 2 adjacent bands. When properly adjusted for harmonic suppression I suspect in should do 20m. On 15m it would be operating into mismatch not ideal. Best way to see this is looking at filter response for the 17m filter, the rsgb article referenced by Hans may have the plots.  The tuning of the class E transmitter is another factor. Receive on 15m might be reasonable with just a few dB of loss. 

Curt


Re: QRP Field Day

 

Can anyone recommend reliable solar panels that can be portable but also used long term at QTH and what they could best charge with QCX? And where to get the entire set up (panels, batteries, charger circuitry)? Or what various options there are, where can I do some reading into this and options? New to all this, thanks.

On 28 Jun 2021, at 04:47, Tony McUmber <1tonymc@...> wrote:

Great fun, yes?

I don't exactly have a go kit, but I can collect coax, a Z-match, 2 X QCX+ (40, 20), a random sort of dipole I use for both bands (straight for 40, with Z-match for 20, a solar game-camera charger and a 12-V gel-cell battery along with assorted odds and ends into a standard briefcase and a small canvas grocery bag.  Hauled all of this to my screened-in porch (for 'roughing-it' effect), and threw up the antenna between a couple of trees.  Made 100 contacts between the two, with bonus points for solar power.  Great fun, yes!

p.s - I copied the FD message from ARRL also, with a little help from the QCX+ decoder.


--
Love 30m and CW?
http://www.30cw.net


Re: dummy load to attenuator mod #dummyload

 

Good suggestions WA8YAN. I got it right but had to keep double checking. That'd be an easy way to not get mixed up. However, I did once put a large component like a BNC or whatever, on the wrong side ox a board only to laugh at my mistake when I realized lol. So one might then also have the wrong "up and down" :) but yes, it is a dummy load project hehe

On 27 Jun 2021, at 21:32, wa8yan.radio via groups.io <wa8yan.radio@...> wrote:

Yup

Lead dummy
WA8YAN



Sent from my Verizon, Samsung Galaxy smartphone


-------- Original message --------
From: Arv Evans <arvid.evans@...> 
Date: 6/27/21 4:48 PM (GMT-05:00) 
Subject: Re: [QRPLabs] dummy load to attenuator mod #dummyload 

In a lame attempt at humor, perhaps someone should point out 
that it is a "dummy" load project.  8-/

Arv
_._


On Sun, Jun 27, 2021 at 1:10 PM wa8yan.radio via groups.io <wa8yan.radio=yahoo.com@groups.io> wrote:
Perhaps it would also be better to say "do not install on the board the BNC connector is on" rather than top board, bottom board since top and bottom are relative to how you are holding it.  (I'm saying that was my error..... even though I'm sure it wasn't) HI HI.
73 Phil WA8YAN



Sent from my Verizon, Samsung Galaxy smartphone


-------- Original message --------
From: "KEN G4APB via groups.io" <lfoofui.nbz42=ntlworld.com@groups.io> 
Date: 6/25/21 4:14 PM (GMT-05:00) 
Subject: Re: [QRPLabs] dummy load to attenuator mod #dummyload 

Note to Hans and potential builders;
3.4 Fit jumper W2-W3 on the top PCB
Fit a jumper wire at W2-W3 on the TOP PCB only.

But,  the picture shown is the bottom board with the bnc connector fitted!
Confused me for a while!!!!
73 Ken g4apb 




--
Love 30m and CW?
http://www.30cw.net


Re: QCX Challenge - June 2021

HB9FIH
 

Will be QRV from Samos
as SV8/HB9FIH
13 / 19 on 20m
GL
--
---
73 de Erich

HB9FIH

HS0ZLS


QCX Mini for 17M - usability on 20M & 15M? #qcxmini

David Feldman
 

I am interested in using a QCX Mini primarily on 17M, with secondary use (without modification, just changing VFO frequency) on 20M and 15M bands.

Can a QCX Mini configured for 17M be used on 20M and 15M bands with some (how much?) compromise in RF performance in receive (sensitivity), transmit (spectral purity, insertion loss), or both?

Manual version 1.05 section 6.7 (regarding receive bandpass filter behavior) suggests to me that the roll-off of the receive bandpass filter for 17M is a few dB at 20M and 15M bands, which represents a loss of sensitivity that would be OK with me.

Manual version 1.05 section 6.6 (regarding transmit low pass filter behavior) refers to a page discussing Ultimate 3S, however, it is not so clear to me to what extent the low pass filter is effective (or perhaps has excess insertion loss) in this situation.

Thank you for any advice,

73 Dave WB0GAZ wb0gaz@yahoo.com


Re: QRP Field Day

Tony McUmber
 

Great fun, yes?

I don't exactly have a go kit, but I can collect coax, a Z-match, 2 X QCX+ (40, 20), a random sort of dipole I use for both bands (straight for 40, with Z-match for 20, a solar game-camera charger and a 12-V gel-cell battery along with assorted odds and ends into a standard briefcase and a small canvas grocery bag.  Hauled all of this to my screened-in porch (for 'roughing-it' effect), and threw up the antenna between a couple of trees.  Made 100 contacts between the two, with bonus points for solar power.  Great fun, yes!

p.s - I copied the FD message from ARRL also, with a little help from the QCX+ decoder.


10W Linear Bias Setting

Mark M
 

Greetings all...

Just a quick question to be sure I did it correctly...

I assembled the QRPLabs 10W linear amp kit I bought a while back. I'm planning to use it with the µSDX I built a few months ago. I powered it up and no smoke came out so I went ahead and set the bias. With both pots counterclockwise (anticlockwise) it was drawing 70 mA. I turned one of the pots until it read 195 mA. Then I turned the other one until it went up another 125 mA, to 320 mA. Is that correct? I believe so but want to sure I read it correctly. Just me overthinking something, as usual.

Thanks...

--
73...      Mark     AA7TA


Re: ProgRock serial interface

Mont Pierce KM6WT
 

Here's another view showing the pins soldered to and dupont jumpers connected:



Re: ProgRock serial interface

Mont Pierce KM6WT
 

Instead of soldering wires to the bottom of S1, I like to solder 90° header pins to the bottom of S1.

then I can use dupont jumpers to connect to my serial adapter (or arduino).



73
km6wt


Re: QRP Field Day

Timothy Freeze
 

Thanks, sounds like a really nice kit. You can take that anywhere!
Sent from my Verizon, Samsung Galaxy smartphone
Get Outlook for Android


From: QRPLabs@groups.io <QRPLabs@groups.io> on behalf of Mike KK7ER <groupio@...>
Sent: Sunday, June 27, 2021 8:14:26 PM
To: QRPLabs@groups.io <QRPLabs@groups.io>
Subject: Re: [QRPLabs] QRP Field Day
 
@Timothy, I found that the QCX+, two slim UPS batteries, straight key, EFHW 1:49 transformer, thin rope, ~30 feet of copper wire, and cables fit nicely into an old metal Dewalt cordless drill case.  I'm not carrying a mast but rather using a "mast" of opportunity (deck railing this time but a tree would work).  I threw in the NanoVNA too, but in a separate box.

73, Mike KK7ER


Re: ProgRock serial interface

Mont Pierce KM6WT
 

On Sun, Jun 27, 2021 at 10:04 AM, Syd wrote:
Should the wires to the DIP switch be connected to both the inside and outside pins of the DIP switch?  Or like I did to just the inside terminals of the DIP switch.  What is the correct way to do this connection?
solder to just the inside pins.

I can see how page 6 can look confusing...  It's a bit more obvious on page 5 (click here) which shows the traces from the switch to the processor.  The green lines are going to the 1st two inside pins of the switch. 
( Ignore the red jumper wire as it's only needed if you do not have S1 installed ).


If you look at the circuit diagram on page 3 of the assembly guide (click here) you will see that S1 pins 5,6,7,8 are all tied to Ground.  S1 pins 1,2,3,4 are connected to input pins on the processor.


When you have the switch already install (as you do), ignore the red jumper wire.  Setting the switches as shown on page 1 (click here), the 2nd switch from the left is closed.  The jumper is only needed if the switch is Not installed.


73
km6wt


Re: QRP Field Day

Mike KK7ER
 

@Timothy, I found that the QCX+, two slim UPS batteries, straight key, EFHW 1:49 transformer, thin rope, ~30 feet of copper wire, and cables fit nicely into an old metal Dewalt cordless drill case.  I'm not carrying a mast but rather using a "mast" of opportunity (deck railing this time but a tree would work).  I threw in the NanoVNA too, but in a separate box.

73, Mike KK7ER


Re: BSS123 Where to buy?

Will, KZ4EX
 

Have had good luck with Jameco


Tried Newark electronics once. I had a lot of trouble with them. I personally would not recommend them.


On Fri, Jun 25, 2021 at 12:38 PM Christopher Maness <christopher.maness@...> wrote:
No, that’s a final.  This is the T/R switch.  I can check though.

On Thu, Jun 24, 2021 at 11:24 PM VK5EEE <vk5eee@...> wrote:
Isn't that a BS170? If so you can order a pack of them at the QRP Labs shop

77 de Lou

> On 24 Jun 2021, at 19:33, Christopher Maness <christopher.maness@...> wrote:
>
> I might need to replace Q5, and digikey seems to be out of them. I like to have cheap parts on hand if I think that it may be the issue when I go in for a repair.  It is easy just to pop the new part in while I have it open. Not a fan of diagnosing then having to wait for a part to come in.  Can you guys suggest a vendor, or if someone has a bunch and can just mail me one.  I would be happy to reimburse for the part and postage.
>
> TNX es 73 de KQ6UP SK ..
>
>
>
>
>
>
> <OpenPGP_0x55BE65AD1B41D696.asc>



--
Love 30m and CW?
http://www.30cw.net






Re: Desoldering

Albert Tatlock's Greatest Hits - Vol 1
 

ranchus Creations: Repairing damaged or lifted pads on a circuit board”
Actually those videos are pretty good.
Thanks for the info.



Re: dummy load to attenuator mod #dummyload

wa8yan.radio
 

Yup

Lead dummy
WA8YAN



Sent from my Verizon, Samsung Galaxy smartphone


-------- Original message --------
From: Arv Evans <arvid.evans@...>
Date: 6/27/21 4:48 PM (GMT-05:00)
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] dummy load to attenuator mod #dummyload

In a lame attempt at humor, perhaps someone should point out
that it is a "dummy" load project.  8-/

Arv
_._


On Sun, Jun 27, 2021 at 1:10 PM wa8yan.radio via groups.io <wa8yan.radio=yahoo.com@groups.io> wrote:
Perhaps it would also be better to say "do not install on the board the BNC connector is on" rather than top board, bottom board since top and bottom are relative to how you are holding it.  (I'm saying that was my error..... even though I'm sure it wasn't) HI HI.
73 Phil WA8YAN



Sent from my Verizon, Samsung Galaxy smartphone


-------- Original message --------
From: "KEN G4APB via groups.io" <lfoofui.nbz42=ntlworld.com@groups.io>
Date: 6/25/21 4:14 PM (GMT-05:00)
Subject: Re: [QRPLabs] dummy load to attenuator mod #dummyload

Note to Hans and potential builders;
3.4 Fit jumper W2-W3 on the top PCB
Fit a jumper wire at W2-W3 on the TOP PCB only.

But,  the picture shown is the bottom board with the bnc connector fitted!
Confused me for a while!!!!
73 Ken g4apb 


Re: Dominique Caron - F5ERS - component damaged on new pcb

wa8yan.radio
 

Speaking of removing blobs of rosin.... what is best to use to do a nice clean job? I tried isopropyl alcohol but it did not do a very good job.



Sent from my Verizon, Samsung Galaxy smartphone


-------- Original message --------
From: Arv Evans <arvid.evans@...>
Date: 6/27/21 4:45 PM (GMT-05:00)
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] Dominique Caron - F5ERS - component damaged on new pcb

That soldering job looks good.  Maybe do a bit of cleanup to remove
blobs of rosin but it is good enough to get the job done.

Arv
_._


On Sun, Jun 27, 2021 at 12:35 PM Caron Dominique <micromacro62@...> wrote:
Good evening Johan,

 Yes, thank you ... I've thought about it and I'm wondering if it's not easier for me to solder a CMS ... I will think again with your message ...
 I am passionate about everything that is small, so it seems easier to me ...
 Here is a test with the first time I soldered a CMS this week for testing, but it was not a smaller type 0805 ...
 I will think again ... thank you ...


Envoyé de mon iPad

Le 27 juin 2021 à 20:17, Johan Bodin <jbodin@...> a écrit :



Dominique,

C41 doesn't have to be a SMD component. If you have a junk box, look for a good quality through-hole capacitor that is small enough to fit the space. I am thinking about small ceramic capacitors like C12 and C29. Cut the wires short and solder the capacitor to the C41 PCB pads.

<glakddhoagiiflen.png>

C41 is a decoupling capacitor for the +5V rail, it is not very critical. Any value between 0.1 to 1 uF will work well.

73 de SM6LKM

Caron Dominique wrote:

 I wait to receive the capacitors and I solder C41 instead.
 I think I'll get there ...


Re: QCX mini combined battery case, desk stand & protector 3D printable #case #enclosure

Arv Evans <arvid.evans@...>
 

Maybe I can help get the discussion started? 
CMS (Charge Management Systems) can be purchased from on-line vendors
for reasonable prices.  Big ones like this URL are configurable.  There are also
less functional CMS boards for a fixed number of cells.  These are identified
as S1 (one cell) through S12 (12 cells in series).  S-nomenclature CMS boards
usually run about 1/4 the price of a configurable controller. 



Or, you can make your own charge voltage limiter using a power MOSFET and/or
a string of diodes as the charge limiter.  A simple circuit like this can stop your
wall-wart from over charging the cell string but you would have to rely on each
cell having its own internal discharge limiting capability. 

External discharge limiting might be just 4 power diodes in series (4 X 0.6 = 2.4V)
with the discharge connection.


Arv
_._


On Sun, Jun 27, 2021 at 1:17 PM wa8yan.radio via groups.io <wa8yan.radio=yahoo.com@groups.io> wrote:
Hi Jim:  I'm interested in your solar collector and regulator. You know things like pictures, make and models and sources, etc.  I dont know much about solar so any help you can give would be much appreciated.  Solar and QCX just seem to be a natural.



Sent from my Verizon, Samsung Galaxy smartphone


-------- Original message --------
From: Jim Sheldon <w0eb@...>
Date: 6/25/21 4:35 PM (GMT-05:00)
Subject: Re: [QRPLabs] QCX mini combined battery case, desk stand & protector 3D printable #case #enclosure #case

Nice job on the .stl file Anthony!  I just got done printing the base, the battery box is running now and will be done in a bit under 2 hours with the battery box cap to go after that.  I have batteries and the Battery Manager ordered, but they won't be here in time for Field Day tomorrow so will be running 100 percent Solar (I have a nice 100 watt solar array and a charge controller that will run 12V all day long with really nice regulation so can run the radios (either the QCX Mini or my KX2) directly from the solar array's output without having to put a battery between them.  I'm going to operate off of my shaded back deck with both the 20 meter Mini and my KX2 for the other bands if I decided to try others besides 20 meters.  Especially if 10 meters opens up.  Antenna will be my MFJ 80-10 meter portable vertical on a tripod out in the yard and 6 radials.  Ought to be fun anyway.

Jim Sheldon, W0EB

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