Date   

Re: QSO Today Virtual Ham Radio Expo - 08/09 August

Ross Wilson
 

Hans,

Maybe it's different if you are in North America or Europe, but I'm trying to join the meeting from Australia and no matter what I do I'm prompted to download the app.

Ross AC3DN


On Sun, 9 Aug 2020, 21:03 Hans Summers, <hans.summers@...> wrote:
Hello all

Thanks, it was nice to chat to so many of you yesterday! 

For those that could not attend - the shack tour was in fact recorded so I am going to see if I can get it on YouTube then people can watch it there. 

The expo chat room is open all day and so feel free to drop in there, it supports keyboard chat, voice chat and video chat. The ZOOM video conference is also open all day see http://qrp-labs.com/zoom

Meeting ID: 838 2352 7803
Passcode: 299230
Link to meeting: https://www.zoom.us/join

Note that you do NOT need a Zoom account to join the zoom meeting. You do not need to provide your email address or any other information about yourself. You only need to enter the above Meeting ID and you can join without any further ado. 

And at 1800Z/UT (until whenever we're tired) I will host another Q&A so please feel free to drop in and discuss whatever you like! 

73 Hans G0UPL
http://qrp-labs.com


On Sun, Aug 9, 2020 at 3:58 PM Gerald Ball via groups.io <gerryball2=talktalk.net@groups.io> wrote:
Thanks Hans
For a brilliant evening and superb tour of the Summers emporium and all the info that came across during the Q & A session. Sorry had to exit Zoom about 11pm. Unlike you youngsters I couldn't stay awake. will look for any recording.

Keep up the good work. Have just completed and boxed my 6th QCX  (all frequencies) And now waiting for the rest of the HF bands to improve. All working perfectly. Congratulations to you and your XYL on your anniversary, and well done handling the emergency and getting the children down to sleep. Remember it well.

73 Gerry G4OJF


Re: 0.03w RF output, 1w at transistor drains, Help? #qcx

ajparent1/KB1GMX
 

There is not 5.2W at the transistor gates ever!  Maybe 5.2V.

IF the power out is really low and the power at the drains blown devices
are often the first call.   However before going that far and a new build
soldering is usually the first and mostly likely suspect.

Hif you heard a snap look at the devices (bs170s finals) and
Q6 for visual clues.

Allison
-------------------------------
Please reply on list so we can share.
No private email, it goes to a bit bucket due address harvesting


Re: Most accurate way to test rf output #qcx40

ajparent1/KB1GMX
 

I test for RF power using Bird wattmeter. Its good enough for most tasks (5% ful scale).
With a 5W  or 10W HF slug its going to be more accurate than needed as its easy to
see 2W vs 4.5.

IF I need more accurate I use calibrate power attenuator (Narda or Bird), additional
attenuators as needed (minicircuits and Kaye) and then into a Spectrum analyzer
(calibrated).  Often that is much more accurate than needed (sub .1db).

For checking a QCX for normal power verses not correct power a simple dummy
load with diode for peak voltage.  It will be more accurate than needed.
I have one of these built up for .1 to 10W use.  Accurate enough for casual
use (meter movement use limits it to about 5%).

A scope can be used instead of the diode detector IF the O'scope has
adequate bandwidth and has something approaching reliable calibration.

Which one is most accurate?  The DC meter checked against any number of
know sources accurate to 3 digits or so.

Allison
-------------------------------
Please reply on list so we can share.
No private email, it goes to a bit bucket due address harvesting


Re: QSO Today Virtual Ham Radio Expo - 08/09 August

Hans Summers
 

Hello all

Thanks, it was nice to chat to so many of you yesterday! 

For those that could not attend - the shack tour was in fact recorded so I am going to see if I can get it on YouTube then people can watch it there. 

The expo chat room is open all day and so feel free to drop in there, it supports keyboard chat, voice chat and video chat. The ZOOM video conference is also open all day see http://qrp-labs.com/zoom

Meeting ID: 838 2352 7803
Passcode: 299230
Link to meeting: https://www.zoom.us/join

Note that you do NOT need a Zoom account to join the zoom meeting. You do not need to provide your email address or any other information about yourself. You only need to enter the above Meeting ID and you can join without any further ado. 

And at 1800Z/UT (until whenever we're tired) I will host another Q&A so please feel free to drop in and discuss whatever you like! 

73 Hans G0UPL
http://qrp-labs.com


On Sun, Aug 9, 2020 at 3:58 PM Gerald Ball via groups.io <gerryball2=talktalk.net@groups.io> wrote:
Thanks Hans
For a brilliant evening and superb tour of the Summers emporium and all the info that came across during the Q & A session. Sorry had to exit Zoom about 11pm. Unlike you youngsters I couldn't stay awake. will look for any recording.

Keep up the good work. Have just completed and boxed my 6th QCX  (all frequencies) And now waiting for the rest of the HF bands to improve. All working perfectly. Congratulations to you and your XYL on your anniversary, and well done handling the emergency and getting the children down to sleep. Remember it well.

73 Gerry G4OJF


Re: Most accurate way to test rf output #qcx40

Don, ND6T
 

My choice is a good oscilloscope. With a good dummy load I can always get better than 1% accuracy. The best of swr/wattmeters have about 5%, if that. As a reference I use an old HP bolometer. I cross check every type of test with other equipment but always go back to the oscilloscope as the best on my bench. And you are correct, the 'scope is just about indispensable when it comes to seeing what is going on within a circuit. An educational tool in itself. I recently sold my old Rigol DS1102e for $100 and bought a new DS1202Ze for $299. Very much worth it for me. It even decodes SPI and I2C serial bit streams. Still cheaper than a modest espresso machine (to put it in perspective). That's my 2 cents worth. -Don


Re: Ultimate U3S #u3s #filter #lpf

John McClun
 

Jules,

I'm at the same point.  Have 4 filters done, in Diagnostic Mode waiting for the last filters and attach antenna.  Maybe I'll hear yours and I hope mine gets out as far as you.  We'll see.

John
NA3NA


Re: Encoder type/mfgr. QCX?

jjpurdum
 

If you don't have a scope, ask your club members for help. Also, some high school physics labs, junior colleges or universities are usually more than willing to help.

Contact bounce can be bad enough to send a false pulse chain to the microcontroller. You can reduce the problem in software or hardware. I used to solder 0.01µF caps from pins A and B to GND and that usually took care of the problem. Lately, I've been more lazy and am doing a software debounce using a non-blocking delay. (The common delay() routine uses its own interrupt and can block any interrupt you might be using.) You can usually do a little trial-and-error to find the smallest delay that eats the false pulse chain.

Finally, some libraries (https://github.com/brianlow/Rotary) (I think??) have symbolic constants that can account for quarter, half, and full cycle differences. (I've slept since I last checked.) Anyway, with a little tinkering, you can probably get just about any encoder to do the job.

Jack, W8TEE





On Sunday, August 9, 2020, 7:15:36 AM EDT, Tom Puckett, W5JXM <thpuckett@...> wrote:


Two aspects of many rotary mechanical encoders that can bite you if you don’t allow for them in your code or circuitry:

1.  An internal switch arm will not always make a clean simple transition between states:  the arm will sometimes bounce enough upon contact closure to break the closure, and then close again, which results in multiple transitions in the voltage waveform.  I’ve seen as many as a dozen extra transitions of this sort.  The waveform processing code/circuitry needs to be smart enough to allow for this situation and pass only a single transition in its output.

2. The encoder may be built as what I will call a full-cycle or a half-cycle device.  In a half-cycle device one detent’s worth of shaft rotation will result in the switch arm(s) making a single transition: an open arm will close, and a closed arm will open.  In a full-cycle device this will be automatically followed by another internally generated half-cycle which returns the arm(s) to their original state.

No, you cannot depend upon the encoder manufacturer’s spec sheet to discuss any of the above.  However if you have access to a scope then a few minutes testing will show you what’s actually going on.

73
Tom/W5JXM


Re: QSO Today Virtual Ham Radio Expo - 08/09 August

Gerald Ball
 

Thanks Hans
For a brilliant evening and superb tour of the Summers emporium and all the info that came across during the Q & A session. Sorry had to exit Zoom about 11pm. Unlike you youngsters I couldn't stay awake. will look for any recording.

Keep up the good work. Have just completed and boxed my 6th QCX  (all frequencies) And now waiting for the rest of the HF bands to improve. All working perfectly. Congratulations to you and your XYL on your anniversary, and well done handling the emergency and getting the children down to sleep. Remember it well.

73 Gerry G4OJF


Re: Encoder type/mfgr. QCX?

Alan de G1FXB
 

On 09/08/2020 12:15, Tom Puckett, W5JXM wrote:
No, you cannot depend upon the encoder manufacturer’s spec sheet to discuss any of the above. However if you have access to a scope then a few minutes testing will show you what’s actually going on.

If you haven't got a scope you can connect LED's on the two internal switch lines and observe the how the switching phase progresses during rotation to draw a state table and compare it to the other encoder


Alan


Re: Encoder type/mfgr. QCX?

Tom Puckett, W5JXM
 

Two aspects of many rotary mechanical encoders that can bite you if you don’t allow for them in your code or circuitry:

1. An internal switch arm will not always make a clean simple transition between states: the arm will sometimes bounce enough upon contact closure to break the closure, and then close again, which results in multiple transitions in the voltage waveform. I’ve seen as many as a dozen extra transitions of this sort. The waveform processing code/circuitry needs to be smart enough to allow for this situation and pass only a single transition in its output.

2. The encoder may be built as what I will call a full-cycle or a half-cycle device. In a half-cycle device one detent’s worth of shaft rotation will result in the switch arm(s) making a single transition: an open arm will close, and a closed arm will open. In a full-cycle device this will be automatically followed by another internally generated half-cycle which returns the arm(s) to their original state.

No, you cannot depend upon the encoder manufacturer’s spec sheet to discuss any of the above. However if you have access to a scope then a few minutes testing will show you what’s actually going on.

73
Tom/W5JXM


Re: QSO Today Virtual Ham Radio Expo - 08/09 August

Ben Bangerter, K0IKR
 

Hans,

i greatly enjoyed our one-on-one Zoom chat before the lab/shop/warehouse tour on Saturday.  Thank you for that opportunity.  The tour was great - nice to see where the “magic” happens, in that square foot of bench space you have allotted yourself! 


73, Ben K0IKR


Most accurate way to test rf output #qcx40

Darren KN4WML
 

Question??    What would you prefer to test for rf power.   Oscilloscope or just a regular swr/rf meter.  I've never owned one so I was just wondering which of the two is more accurate. I know the scope can help with the testing and diagnosing with the power.  I'm having a little issue with my qcx+ build where the audio output is a little low on the volume side, hopefully it's just a little issue.

Darren
KN4WML,


Re: QCX mini: RF output BNC or SMA #poll-notice

namerati@...
 

On Fri, Aug 07, 2020 at 10:17:14PM +0000, Graham, VE3GTC wrote:
This is has been an interesting discussion.

Besides SMA and BNC, the TNC and RCA connector has been mentioned but in
reality there are many more good choices.

For example, the FME connector ( FME - For Mobile Equipment ), good to
several GHz, PCB mount, bulkhead mount, size not too much bigger than RG-58
cable, and not very expensive.
That's also an option, though the MCX PCB mount jacks that I have share the same footprint as SMA PCB mount jacks, so in that case users would have an option of either one. I don't know if that's true for FME, which is just obscure enough that my local supplier doesn't carry FME PCB mount jacks.

Additionally, FME connectors look to be for RG58/59 cable, and as this is a *mini* and *ultra-portable* transceiver I would probably end up using RG174.

No sense in carrying 300 grams worth of cable when 30 grams will do!

There is also the mini UHF connector, also good to several GHz, PCB mount,
bulkhead mount,.
Nice but, again, obscure enough that my "supplier of reference" doesn't carry much along those lines.

SMA and MCX seem widely available (not to mention RCA...) -- if we are going for obscure connectors then we might as well add APC3.5 (SMA-compatible but robust) or Lemo 00 NIM-CAMAC (tiny and super-robust, as well as super-expensive) to the mix...


Re: Ultimate U3S #u3s #filter #lpf

Lex PH2LB
 

Thats a nice collection you got there Jules with good values. Well done. 


Re: 0.03w RF output, 1w at transistor drains, Help? #qcx

Ben
 

That 5.2W is the max reading if i remember. Are C25 and C26 still OK? Did you use a dummy load?


0.03w RF output, 1w at transistor drains, Help? #qcx

 

Hello, I built my QCX Plus kit the other day, and have been using it without any luck, so I decided to check if there was any RF output. It appeared that, there was not. I measured .13w at the output of the LPF, but 5.2w at all transistor gates, After re-soldering all the toroids and ensuring continuity, i probed again, with no change. Eventually, while probing, there was a sharp 'snap' sound and the transistor watt measurements dropped to 1w, and .03 at the output of the lpf. I do not know where to go from here, help?


Re: Connection To The QRPLabs 50 Watt Amplifier - QCX vs QCX+ ?

Bob Ballard
 

Thanks Greg!  Just what I needed.

 

I would prefer not to tinker with the guts of my QCX+ PCB so I will take the option of re-wiring one of these cables (or simply replace the plugs) to fit the cable connection description on page 100 and carefully mark which plug goes into which device.  😊

 

Thank you again for straightening me out before I seriously damaged my perfectly good QCX+ that is working great producing 4.5 Watts into the Dummy Load when powered at 13.3v.

 

73,

Bob – KG5SQJ

 

From: QRPLabs@groups.io <QRPLabs@groups.io> On Behalf Of Gregg Myers
Sent: Saturday, August 8, 2020 9:45 PM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] Connection To The QRPLabs 50 Watt Amplifier - QCX vs QCX+ ?

 

Hi Bob,

 

An audio 3.5mm male to male patch cable should work. Basically, you want a cable with a shield, plus two conductors (e.g. a stereo cable) Something like this (not necessarily this one, but anything similar): 

 

73! 

Gregg

 

On Sat, Aug 8, 2020 at 8:08 PM Bob Ballard <bobnmarji@...> wrote:

Okay guys (Bob and Gregg), thank you both very much for your prompt response (I will remove the extra 10K resistor I added to the my QCX+).

 

I apologize for missing the information on page 100.  I looked through the manual for specific information regarding the 50 Watt Amplifier but apparently I only meagerly scanned page 100 and missed it because I assumed that page only had to do with the GPS stuff … OOPS!

 

I just ordered the 3.5mm stereo plugs and they should arrive Monday.  What kind of cable do I need (i.e., does it need to be coax or something special?) and where can I order it?

 

Thank you both again for your prompt assistance.

 

Bob – KG5SQJ

 

From: QRPLabs@groups.io <QRPLabs@groups.io> On Behalf Of Gregg Myers
Sent: Saturday, August 8, 2020 8:28 PM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] Connection To The QRPLabs 50 Watt Amplifier - QCX vs QCX+ ?

 

Hi Bob,

 

Re: the 10k pull up resistor on IC3 for QCX+, pin 13, I believe it is already there as R36 show in the schematic of the QCX+. See attached picture.

 

73,

Gregg W7GRM

 

 

 

On Sat, Aug 8, 2020 at 7:16 PM N3MNT <bob@...> wrote:

The PTT cable is wired differently from standard audio cables.  You can simply build on per the diagram on page 100 of QCX+ manual.


Re: Connection To The QRPLabs 50 Watt Amplifier - QCX vs QCX+ ?

Gregg Myers
 

Hi Bob,

An audio 3.5mm male to male patch cable should work. Basically, you want a cable with a shield, plus two conductors (e.g. a stereo cable). Something like this (not necessarily this one, but anything similar): 

73! 
Gregg

On Sat, Aug 8, 2020 at 8:08 PM Bob Ballard <bobnmarji@...> wrote:

Okay guys (Bob and Gregg), thank you both very much for your prompt response (I will remove the extra 10K resistor I added to the my QCX+).

 

I apologize for missing the information on page 100.  I looked through the manual for specific information regarding the 50 Watt Amplifier but apparently I only meagerly scanned page 100 and missed it because I assumed that page only had to do with the GPS stuff … OOPS!

 

I just ordered the 3.5mm stereo plugs and they should arrive Monday.  What kind of cable do I need (i.e., does it need to be coax or something special?) and where can I order it?

 

Thank you both again for your prompt assistance.

 

Bob – KG5SQJ

 

From: QRPLabs@groups.io <QRPLabs@groups.io> On Behalf Of Gregg Myers
Sent: Saturday, August 8, 2020 8:28 PM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] Connection To The QRPLabs 50 Watt Amplifier - QCX vs QCX+ ?

 

Hi Bob,

 

Re: the 10k pull up resistor on IC3 for QCX+, pin 13, I believe it is already there as R36 show in the schematic of the QCX+. See attached picture.

 

73,

Gregg W7GRM

 

 

 

On Sat, Aug 8, 2020 at 7:16 PM N3MNT <bob@...> wrote:

The PTT cable is wired differently from standard audio cables.  You can simply build on per the diagram on page 100 of QCX+ manual.


Re: QSO Today Virtual Ham Radio Expo - 08/09 August

Shane Justice
 

Hi Curt,
Thank you for the encouragement! I will try again- I missed the live chat with Hans, as I had some pressing errands to run and a 200 mile round trip to accomplish them. 

I am greatly looking forward to assembling the U3S Deluxe kit, and want to order the QSX when it becomes available. 

Hans, here's wishing you and yours a happy Anniversary and thanking your dear wife for sharing her time with all us hams on your Anniversary! 

73,
Shane
KE7TR

On Aug 8, 2020 at 17:03, wb8yyy via groups.io <wb8yyy@...> wrote:

Shane, Martin try again tomorrow.

To get into the event, just register with your email.

To get to Hans zoom, there is a place to log into hosted meeting,  just need the meeting ID and passcode posted by Hans. If zoom asks you to register,  you clicked the wrong link.

Nice to chat live with Hans today. I attended a few presentations,  the 630m one can still be seen as recorded video.

I hope qrp labs gets some nice business from it. 73 curt wb8yyy


Re: Connection To The QRPLabs 50 Watt Amplifier - QCX vs QCX+ ?

Bob Ballard
 

Okay guys (Bob and Gregg), thank you both very much for your prompt response (I will remove the extra 10K resistor I added to the my QCX+).

 

I apologize for missing the information on page 100.  I looked through the manual for specific information regarding the 50 Watt Amplifier but apparently I only meagerly scanned page 100 and missed it because I assumed that page only had to do with the GPS stuff … OOPS!

 

I just ordered the 3.5mm stereo plugs and they should arrive Monday.  What kind of cable do I need (i.e., does it need to be coax or something special?) and where can I order it?

 

Thank you both again for your prompt assistance.

 

Bob – KG5SQJ

 

From: QRPLabs@groups.io <QRPLabs@groups.io> On Behalf Of Gregg Myers
Sent: Saturday, August 8, 2020 8:28 PM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] Connection To The QRPLabs 50 Watt Amplifier - QCX vs QCX+ ?

 

Hi Bob,

 

Re: the 10k pull up resistor on IC3 for QCX+, pin 13, I believe it is already there as R36 show in the schematic of the QCX+. See attached picture.

 

73,

Gregg W7GRM

 

 

 

On Sat, Aug 8, 2020 at 7:16 PM N3MNT <bob@...> wrote:

The PTT cable is wired differently from standard audio cables.  You can simply build on per the diagram on page 100 of QCX+ manual.