Date   

Re: QCX Plus 50 Watt PA Combo

George Korper
 

I actually would prefer it as is so I don't need to add a cutout for an LCD. 
Any other holes I can plug. If I don't use the LCD slot I will put a screen behind it. 


On Fri, May 29, 2020 at 5:04 PM Hans Summers <hans.summers@...> wrote:
Hi George 

The link is not working for me. 


Thanks for the info, I order cases with the AMP so I probably will settle for the elegant (Collins S Line) look.

Ha! In this case, a QRP Labs Q line

 So here is the question. Will separate enclosures   
be available for purchase? Like for a spectrum scope? Or SWR Meter tuner, etc. 

Separate QCX+ enclosures are already available. But I know you mean, the enclosure with plain front and back panels that you can make your own stuff in and have it match. So I'd have to buy some extra, blank panels. I suppose that's possible! Let me think about it! 

73 Hans G0UPL 


Re: What are you QRP guys using to measure power?

George Korper
 

Me too. The QRPoMeter ( I have two) is accurate, fun to build and worth every penny. 


On Fri, May 29, 2020 at 6:17 PM Al Clark <hotdogx@...> wrote:
I use the QRPoMeter by NM0S David Cripe.  https://www.ebay.com/itm/QRPoMeter-Digital-15W-QRP-Wattmeter-Dummy-Load-VSWR-Meter-Kit/254596727364?hash=item3b4725c244:g:fgAAAOSwlY1ZMMdT
Handles up to 15 watts, won't let your rig see a high SWR, and is accurate.  Easy to build and calibrate.

--
Al W4KY


Re: What are you QRP guys using to measure power?

Daniel Conklin
 

I'm using the QRP guys 12w dummy load hooked to a resistive voltmeter. V squared divided by 100=watts 
--
73, Dan - W2DLC


Re: What are you QRP guys using to measure power?

Mike Besemer - WM4B
 

Interesting.  Mine is off at least 50% compared to measuring with a scope.  Build has been validated; something is afoot at the Circle K.

 

Mike

WM4B

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of Al Clark
Sent: Friday, May 29, 2020 6:17 PM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] What are you QRP guys using to measure power?

 

I use the QRPoMeter by NM0S David Cripe.  https://www.ebay.com/itm/QRPoMeter-Digital-15W-QRP-Wattmeter-Dummy-Load-VSWR-Meter-Kit/254596727364?hash=item3b4725c244:g:fgAAAOSwlY1ZMMdT
Handles up to 15 watts, won't let your rig see a high SWR, and is accurate.  Easy to build and calibrate.

--
Al W4KY


Re: What are you QRP guys using to measure power?

Al Clark
 

I use the QRPoMeter by NM0S David Cripe.  https://www.ebay.com/itm/QRPoMeter-Digital-15W-QRP-Wattmeter-Dummy-Load-VSWR-Meter-Kit/254596727364?hash=item3b4725c244:g:fgAAAOSwlY1ZMMdT
Handles up to 15 watts, won't let your rig see a high SWR, and is accurate.  Easy to build and calibrate.

--
Al W4KY


Re: QCX-SSB Help what do I do now? #qcx

Jim Painter
 

Frank, if you’re talking about the QCX+, go to the qrp lab web site. Look under kits. If you’re talking about the QSX, look under coming soon.

Jim....kq3s


On May 29, 2020, at 11:33 AM, wfcaston@... wrote:

Peter,

Where can I get info on the new QCX rig that is coming out probably later this year?  Is it possible it is a multi band unit?  I am just coming up to speed on my 20 meter QCX, but looking ahead.  Thanks,

Frank
WV4C


Re: What are you QRP guys using to measure power?

fred.g3srf@...
 

For low power, I use a Marconi TF1152/A. 1960's vintage it uses a thermocouple so the calibration can be checked at DC and it's good to VHF and low UHF. Two ranges of 10 Watts and 25 Watts. No good for SSB, only CW, AM and FM.


Re: What are you QRP guys using to measure power?

Mike Besemer - WM4B
 

I think we need a QRP-Labs meter – 0 to 5 watts!

 

Mike

WM4B

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of ajparent1/KB1GMX
Sent: Friday, May 29, 2020 5:39 PM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] What are you QRP guys using to measure power?

 

I use...

QPSA, a Steve Webber design for over 10 years ago also SWR/frquency counter/aux
audio amp.

DL5NG terminated diode mount (up to 10mw or so, with calibration table.

A dummy load based on caddock resistors (25W) and diode for the
10mw to  20W range HF and calibrated.

Bird Model 43 throughline watteter. Large number of slugs for it.
Loads:  Bird Dummy load (100W), Heath cantenna for higher power.
A lower power 100W pint-enna  (high power (caddoc) resistor in Pint can.

RIgol DSA815T or HP8568B SA with 30DB 50W power attenuator (narda 7768-30)
Also a Bird 50W model similar.

All in cal.

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


Re: What are you QRP guys using to measure power?

Mike Besemer - WM4B
 

Looks like it’s NLA.

 

Mike

WM4B

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of ccoles326@...
Sent: Friday, May 29, 2020 4:56 PM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] What are you QRP guys using to measure power?

 

Hello,
I'm using the radio-kits power meter kit. It's flippin' great!
--

It's a really useful kit. Great fun to build.

Find them here: https://www.radio-kits.co.uk/

#wattmeter

Best regards,
Chris
M0XFL


Re: What are you QRP guys using to measure power?

ajparent1/KB1GMX
 

I use...

QPSA, a Steve Webber design for over 10 years ago also SWR/frquency counter/aux
audio amp.

DL5NG terminated diode mount (up to 10mw or so, with calibration table.

A dummy load based on caddock resistors (25W) and diode for the
10mw to  20W range HF and calibrated.

Bird Model 43 throughline watteter. Large number of slugs for it.
Loads:  Bird Dummy load (100W), Heath cantenna for higher power.
A lower power 100W pint-enna  (high power (caddoc) resistor in Pint can.

RIgol DSA815T or HP8568B SA with 30DB 50W power attenuator (narda 7768-30)
Also a Bird 50W model similar.

All in cal.

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


Re: What are you QRP guys using to measure power?

Eng. Fabio Barroso <fbbrito@...>
 

Hello, 

I am using my power meter model RS-102. It is beautiful and accurate with a green backlight.

73, PT7CA



Em sex, 29 de mai de 2020 às 17:56, <ccoles326@...> escreveu:

Hello,
I'm using the radio-kits power meter kit. It's flippin' great!
--

It's a really useful kit. Great fun to build.

Find them here: https://www.radio-kits.co.uk/

#wattmeter

Best regards,
Chris
M0XFL

--
Fábio Barroso Brito
Engenheiro de Telecomunicações
CREA 061787033-0 


Re: QCX Plus 50 Watt PA Combo

Hans Summers
 

Hi George 

The link is not working for me. 


Thanks for the info, I order cases with the AMP so I probably will settle for the elegant (Collins S Line) look.

Ha! In this case, a QRP Labs Q line

 So here is the question. Will separate enclosures   
be available for purchase? Like for a spectrum scope? Or SWR Meter tuner, etc. 

Separate QCX+ enclosures are already available. But I know you mean, the enclosure with plain front and back panels that you can make your own stuff in and have it match. So I'd have to buy some extra, blank panels. I suppose that's possible! Let me think about it! 

73 Hans G0UPL 


Re: What are you QRP guys using to measure power?

ccoles326@...
 

Hello,
I'm using the radio-kits power meter kit. It's flippin' great!
--

It's a really useful kit. Great fun to build.

Find them here: https://www.radio-kits.co.uk/

#wattmeter

Best regards,
Chris
M0XFL


Re: QCX Plus 50 Watt PA Combo

George Korper
 

Hans,
The link is not working for me. 
Thanks for the info, I order cases with the AMP so I probably will settle for the elegant (Collins S Line)
look.

 So here is the question. Will separate enclosures   
be available for purchase? Like for a spectrum scope? Or SWR Meter tuner, etc. 
73,
George

On Fri, May 29, 2020 at 7:55 PM ajparent1/KB1GMX <kb1gmx@...> wrote:
One last suggestion use the external jumper option because if the PA quits
you cannot use the QCX barefoot,  it does not have a straight through
powered off option.   So the hardwired version means your full power
all the time.

Also you can run both of 13V, the PA will be at reduced power
[20-25W] but for many that is a comfortable increase.

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


Re: [help] Only noise being seen while IQ balance / phase lo / phase hi.

Jose Tent
 

On Fri, May 29, 2020 at 05:40 AM, dl8lrz wrote:
  • the junction of R39&40 =   3.32v
The voltage should be about 4.2V (Manual), 3.32V is little. If C24 is installed with the correct polarity, this can indicate a defective IC10 ??
R39&40 junction is pin 5, +input for 10B.  I'm getting very suspcious of the IC10.   All voltage except pin 4 & 8 (V- in & V+ in)  is wrong.  

Measured voltage for IC10 are:   pin  1  ~ 8   :   11.7  / 11.7 / 11.7 / 0  ==  3.3 / 2.31 / 11.7 / 11.7    (Volts) 
Manual indicates :                        pin  1  ~ 8   :   5.8   / 5.8   / 5.8  / 0   ==  4.2 / 3.94 / 5.83 / 11.67    (Volts) 

I tried to suspect that I've done something wrong instead of suspecting a component.  But, perhaps I should just replace the IC rather than wondering if it's good or NG.   Wonder if I can source this IC locally. 





Re: Off topic:

jjpurdum
 

That's one option, but I felt others might like reading it. I changed the tag line so everyone would know it was not a continuation of the existing thread. Personally, I have enjoyed reading the other posts about living in Japan and Okinawa. If I do have a directed question, I, too, use private email.

Jack, W8TEE

On Friday, May 29, 2020, 4:00:28 PM EDT, ajparent1/KB1GMX <kb1gmx@...> wrote:


There are a lot of options, do what you want.

I like  using private reply for that stuff..

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


Re: 5W power amp 5V regulator issue

Jp - PF0X
 

Hi all,
it's weird, but I had exactly the same problem. I noticed the shift register getting really hot when trying to do a first test power-up of the PA that I started to check voltages and came across this topic. The TO92 in the orientation on the print (2016) gives 11.6V on the out towards IC1. The otherway around, a nice 5V... weird...

73s,
Jp - PF0X


Re: Off topic:

ajparent1/KB1GMX
 

There are a lot of options, do what you want.

I like  using private reply for that stuff..

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


Re: QCX Plus 50 Watt PA Combo

ajparent1/KB1GMX
 

One last suggestion use the external jumper option because if the PA quits
you cannot use the QCX barefoot,  it does not have a straight through
powered off option.   So the hardwired version means your full power
all the time.

Also you can run both of 13V, the PA will be at reduced power
[20-25W] but for many that is a comfortable increase.

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


Re: QCX Plus 50 Watt PA Combo

Hans Summers
 

P.S. For 50W operation I would keep the heatsinks, and have them bolted on top of the QCX+ enclosure. 

PPS. Note of course, the other EASIEST option is separate 50W PA unit and QCX+ which also looks very nice, two black enclosures, one sitting on top of the other... starts to look very sophisticated...   :-D

73 Hans G0UPL

On Fri, May 29, 2020 at 10:21 PM QRP Labs <hans.summers@...> wrote:
Yes. It is as Allison says. 

If I was gonna install the 50W PA in the QCX+ I'd drill holes in the top for the IRF510s, the same as is done for the 50W PA enclosure, and bolt the 50W PA in the roof of the QCX+ Enclosure. There is room for it (by design). You need to fit it a little left of center so that the 50W PA PCB does not interfere with the 5K gain potentiometer or the LCD mounting bolts. This will be very easy to see when you have it in front of you. Bolt it to the roof of the case using 5mm spacers, these are enough for the body of the IRF510. There are even convenient mounting holes in the corners of the 50W PA PCB (also by design). 

Be sure to solder the 50W PA IRF510s AFTER having bolted them to the enclosure case and bolting the 50W PA PCB to the enclosure case, so that you aren't putting undue stress on their wires. 

You will need to think carefully about what to do at the back. And how to power it. You don't want to power both the QCX+ and the 50W PA at 20V; that will be too much for the QCX+. 

At one extreme: drill holes in the rear of the QCX+ Enclosure for ALL the connectors of the 50W PA, and arrange separate 12V and 20V power supplies for the QCX+ and 50W PAs; have a short coax jumper cable from the output of the QCX+ to the input BNC of the 50W PA; and a 3.5mm jumper cable from the QCX+ PTT output to the 50W PA PTT input. 

At the other extreme: drill NO extra holes in the rear of the QCX+. Cut a couple of traces and install a 7812 regulator to power the QCX+ from the 20V supply of the 50W PA. Don't install any of the connectors on the 50W PA, and instead, wire them to the appropriate places... cut a trace near the RF output of the QCX+ and instead wire that to the 50W PA input, then wire the 50W PA output to the QCX+ BNC RF connector. Connect the PTT signal directly to the corresponding place (on the QCX+ and 50W PA kits). 

There are shades of grey between these extremes, where you do different amounts of internal wiring to replace some connections, and have some but not all of the 50W PA connectors come out the back through holes in the rear panel you drill. 

Note also that there is space for the QCX+ Dev board http://qrp-labs.com/qcxpdev in the QCX+ enclosure, as well as the 50W PA kit. As long as you don't put any too tall components on the QCX+ Dev board, everything will fit. So that could be a convenient place to site a 7812 regulator and low profile heatsink neatly, and replace a bunch of wiring with the pin header connectors supplied in the dev kit. 

Lots of possibilities! Which is the fun thing about QCX+... being physically larger there is more scope for customization and experiment. 

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


On Fri, May 29, 2020 at 10:02 PM ajparent1/KB1GMX <kb1gmx@...> wrote:
>>> Can you separate the IRF510  and heatsink from the board with wires?

No,  lead inductance and inter lead capacitance are really bad juju.
Its more than bad to separate them by any distance.  IRF510s have significant
gain to VHF  and most of the bad designs out there the poor thing are standing
on full legs and working very poorly or bordering on oscillation.

Tisha, the 50W PA has no fold back so introducing that confuses the issue.

The key is the board and layout is very short leads for RF stability and also
managing to mount the devices.  If the board is the correct height above the
case the transistor mount to it and on the outside mount the heatsink supplied
for cooling (to remove the heat).

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