Date   

Re: 80 Meter 50 Watt PA

Bill Cromwell
 

Hi,

Just to add to comments from Ron and Shirley the difference between 40 watts and 50 watts is insignificant. We have to double the power output to gain something a bit more than a half S-unit at the receiving end. Or reduce it by half to lose that small amount at the receiver. The difference between 40 watts and 50 watts will be completely invisible to me when I tune across your signal :) Enjoy.

I am pleased to see these reports. I will now be ordering my own 50 Watt amp and building it for 80 meters:)

73,

Bill KU8H

bark less - wag more

On 7/6/20 12:38 PM, Ralf Rosche wrote:
Hi all,
i am using my 80m 50w PA since some time now.
I took 50-2 toroids and 470pf and 1200pf silver mica caps.
I tested the low pass with my nano VNA and it works perfect as expected.
Bias adjustment was no problem. Works good out of the box :-)
Regarding the output power, what do you achive?
I took a 19V Notebook power supply and getting about 40watts with 3350mA current drain.
It peeks at 45w at keydown and goes back to 40w.
My QCX is powered with 12V and has 3w rf output.
Is 40w usual or should I optimize my PA?
Ralf


Change Request.

N3MNT
 

On the surface this may seem like a senseless request, but as i get more and more QRP-Labs kits with QRP-Labs enclosures, I find it needed to add label for the power requirements so I don't accidentally supply an incorrect voltage.  If any changes are made to back panels in the future, would it be possible to add the voltage for the power connector.  I am so impressed by this kit that I hate  to ask for any changes, but this should be an easy one if any future changes are made.


Re: QCX+ alive!

Dean Smith
 

Just added 9 pin dway for GPS/ISP
No need to take lid off to update :)
Cringey moment but worth it!


Horizontal lines after power up

Jim Netwal
 

I just finished assembling a new QCX 20 (non plus) and the display shows horizontal lines.  At first power up it booted fine.  I was able to set the band and adjust the screen.  After a couple minutes of being on horizontal lines started moving from top to bottom eventually ending with one line that is no longer moving.  Any thoughts?

Thank you!
Jim W9UUM


Re: TNT Shipment 123511328 - Your shipment to United States has been delivered

Larry Taylor
 

What is your serial number?

Larry

. That explains the typos. 

On Jul 6, 2020, at 11:06, K2DB Paul Mackanos <paul.mackanos@...> wrote:


It was just delivered.
Paul K2DB
<IMG_0978.jpg>


---------- Forwarded message ---------
From: myTNT <reply@...>
Date: Mon, Jul 6, 2020 at 2:00 PM
Subject: TNT Shipment 123511328 - Your shipment to United States has been delivered
To: <paul.mackanos@...>


Your shipment has been delivered!
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Shipment number:
123511328
Your shipment has been delivered
Shipment 123511328 has been delivered to Homosassa, United States today.
From
Ortaca, Turkey
June 30, 2020
  Delivered to
Homosassa, United States
July 6, 2020 at 13:54




 
 
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TNT Shipment 123511328 - Your shipment to United States has been delivered

K2DB Paul Mackanos
 

It was just delivered.
Paul K2DB


---------- Forwarded message ---------
From: myTNT <reply@...>
Date: Mon, Jul 6, 2020 at 2:00 PM
Subject: TNT Shipment 123511328 - Your shipment to United States has been delivered
To: <paul.mackanos@...>


Your shipment has been delivered!
Email not displaying correctly? click here
Shipment number:
123511328
Your shipment has been delivered
Shipment 123511328 has been delivered to Homosassa, United States today.
From
Ortaca, Turkey
June 30, 2020
  Delivered to
Homosassa, United States
July 6, 2020 at 13:54




 
 
Delivered
See more details
 
PS: Don't forget to download our mobile
app to manage all your shipments.
 
What do you think of this email?
1 2 3 4 5
 
 
This email has been sent to you by TNT notification service. This is because the email address paul.mackanos@... has been registered to receive notifications for this specific shipment. If this wasn’t you, you can unsubscribe.

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Re: 80 Meter 50 Watt PA

Shirley Dulcey KE1L
 

Also, the output power is rated at 20V input. Your laptop power supply is rated at 19V, and it may not deliver that full voltage under what is likely to be a near-maximum load for it. Check the actual voltage being delivered to the 50W PA; if it's well under 20V, the output power is going to be less than 50W.


On Mon, Jul 6, 2020 at 1:09 PM Ronald Taylor <wa7gil@...> wrote:
Ralf, speaking only from my own experience, I did the same thing. I actually built a multi-band version with switched lowpass filters and got similar results on 80. I noticed the amplifier performed best on 40 meters with a slight decline on 80. Remember it was designed for optimal performance on 40, 30 and 20 meters. But 40 watts on 80 will certainly perform very well. And it's only 1 dB down from 50 watts. I would say enjoy it as is... 73 ... Ron

On Mon, Jul 6, 2020 at 9:38 AM Ralf Rosche <ralf.rosche@...> wrote:
Hi all,
i am using my 80m 50w PA since some time now. 
I took 50-2 toroids and 470pf and 1200pf silver mica caps.
I tested the low pass with my nano VNA and it works perfect as expected.
Bias adjustment was no problem. Works good out of the box :-)

Regarding the output power, what do you achive?
I took a 19V Notebook power supply and getting about 40watts with 3350mA current drain.
It peeks at 45w at keydown and goes back to 40w.

My QCX is powered with 12V and has 3w rf output.

Is 40w usual or should I optimize my PA?

Ralf


Re: QCX+ - not working after assembly

Knut Steinar Fremme OE4KSF
 

Just a short comment 
I'm really amazed about this kit , how much functionality that has been put into the unit - and to that cost.
After some fine adjustments etc - I'm now able to listen to signals down to 0.2uV and output stable at 3.5W - 12V :-)

On my wish list could be a AGC on the LF output and I'm going to make one. 

And I will also mount a speaker and small amplifier in the box.

Another thing is that I would prefer swapping the position of the volume and tuning buttons - easier to reach the upper one than the lower position for tuning.

But in general - a superb kit 
Thank you Hans

73 OE4KSF Knut


Re: QCX+ - not working after assembly

Knut Steinar Fremme OE4KSF
 

Well - I isolated the whole thing to around the SI5351, and did not find any soldering faults etc, so there was aither the SI or the x-tall.
Easier to change the x-tall - so started with that one, and that worked.

I have now left the unit be powered up for 4 hours , did the calibration of reference frequency by using 1pp from GPS,
Found the frequency then to be  14.000.707, but after some manual adjusting - able to get it to  14.000.000,017 :-)
See attached photos
And one photo from my reference - I think it should be good. I have 2 of them and they show the same :-) 







Re: 80 Meter 50 Watt PA

Ronald Taylor
 

Ralf, speaking only from my own experience, I did the same thing. I actually built a multi-band version with switched lowpass filters and got similar results on 80. I noticed the amplifier performed best on 40 meters with a slight decline on 80. Remember it was designed for optimal performance on 40, 30 and 20 meters. But 40 watts on 80 will certainly perform very well. And it's only 1 dB down from 50 watts. I would say enjoy it as is... 73 ... Ron


On Mon, Jul 6, 2020 at 9:38 AM Ralf Rosche <ralf.rosche@...> wrote:
Hi all,
i am using my 80m 50w PA since some time now. 
I took 50-2 toroids and 470pf and 1200pf silver mica caps.
I tested the low pass with my nano VNA and it works perfect as expected.
Bias adjustment was no problem. Works good out of the box :-)

Regarding the output power, what do you achive?
I took a 19V Notebook power supply and getting about 40watts with 3350mA current drain.
It peeks at 45w at keydown and goes back to 40w.

My QCX is powered with 12V and has 3w rf output.

Is 40w usual or should I optimize my PA?

Ralf


Re: 80 Meter 50 Watt PA

Ralf Rosche, SWLRR
 

Hi all,
i am using my 80m 50w PA since some time now. 
I took 50-2 toroids and 470pf and 1200pf silver mica caps.
I tested the low pass with my nano VNA and it works perfect as expected.
Bias adjustment was no problem. Works good out of the box :-)

Regarding the output power, what do you achive?
I took a 19V Notebook power supply and getting about 40watts with 3350mA current drain.
It peeks at 45w at keydown and goes back to 40w.

My QCX is powered with 12V and has 3w rf output.

Is 40w usual or should I optimize my PA?

Ralf


QCX+, 50W amp and GPS Rx arrived UK

John Pagett G4YTJ
 

My QCX+ kit, amplifier and GPS were dispatched from QRP Labs HQ on Friday and arrived today.
Tracking on TNT was faultless.

Now I've got to decide which one I'm building first!

Thanks, Hans.

John
G4YTJ


QCX+ Arrived in Nova Scotia

Vernon Matheson
 

Rec'd by TNT in Ortica on June 30, arrived July 6...pretty darn good service.

Vernon


Re: 50W Amp, blown up!

George Korper
 

Hi Mike,
I'm sure you will find it. Please post when you do. 
George

On Mon, Jul 6, 2020 at 7:02 AM Mike Hoddy <g0jxx.radio@...> wrote:
Hi Alison, I did read the manual and attempted to set the bias from zero to 85mA with no RF and then back off But it went from nothing to 125mA (approx) pretty quickly.  No, I’m not using it for SSB , CW only as its paired with a QCX running just less than 2W   I’ve made one before, for 40m and that works fine.  It’s possible I’ve wound something wrong but a visual check doesn’t show that and the turns aren’t shorting out to the ferrites as far as can be tested.  It could be I’ve made a fundamental error somewhere in the build.


Re: QCX+ - not working after assembly

Daniel Curtin KF4AV
 

How did you detect that the crystal was bad?


Re: QCX+ receives SAQ #qcx #qcx+ #qcx #vlf

Niels Jalling
 

Congratulations Micha

I wasn't prepared for the event. In the last minutes before the second sendings I tried to make an upconverter using a double balanced mixer and a signal generator to be used with my old yaesu tf77. But no signals came through. Better prepared for next event at christmas time. And plan to visit the site when covid is over.
73 de oz9ny, niels


BPF ceramic trimmer part number?

Adrian Scripcă
 

Hi all,

After having had some problems with the plastic style trimmers supplied with the "old" BPF kits, I decided to stock on the new style of ceramic trimmers which seem to last much longer when reworking (I wanted to experiment with a stock 40m BPF and narrow its bandwidth and the plastic ones died on me).

Any idea on what the part number for the ceramic trimmer shipped with the BPF is and where can I find some?

Thank you,
Adrian, YO6SSW


Re: Problem with BPF

GM7
 

Other possible errors is a shorted input or output, wrong part wrong hole
or improperly cal'd nanoVNA.

I can't see any sign of a bridge between input and output but it's a good suggestion.  It's tricky to test this as you obviously expect continuity between these point via the input/output windings.   There is continuity.  I'll check this more carefully.

 

This was a good suggestion but at the time I found it difficult to verify that there was no bridge.  It's hard to see visually and even more difficult to measure.  Instead I took a completely different approach.  I shorted out the input winding which completely changed the response curve.  I repeated this with the output winding with the same result.  At this point I think it's safe to rule out a short in the input or output.

In the same way I shorted out the main winding on t1 so that it was no longer in circuit.  This shifted the reponse curve up in frequency to around 19MHz.  I did the same to t2 with the same effect.

Unfortunately I seem to be ruling things out without getting any closer to solving the problem.

 


Re: Si5351A'Synth & QCX+TCXO

Jim Mcilroy
 

Digikey have several options.

On 06/07/2020 02:56, Nigel D wrote:
I've been running a 2m WSPR transmitter using a U3s and amplifier with a QLG1 GPS for disciplining for the last six months. The U3s has a 27MHz TCXO installed sourced from:
https://www.aliexpress.com/item/32728463719.html
OK, you have to buy 10 but at US$11.45 for the 10 it gives you spares to fit to all the other QRP labs projects! It is installed with short wire leads as it does not fit exactly to the space allowed for it on the board.
Stability is excellent, on 2m long term it remains within 10Hz of the frequency and short term displays no drift on WSPR. I also have removed the BS170 from the board and take the SI5351A output direct to the amplifier via a low pass filter. The BS170 offers little gain at 2m.
Nigel VK6NI


Re: 50W Amp, blown up!

Mike Hoddy
 

Hi Alison, I did read the manual and attempted to set the bias from zero to 85mA with no RF and then back off But it went from nothing to 125mA (approx) pretty quickly.  No, I’m not using it for SSB , CW only as its paired with a QCX running just less than 2W   I’ve made one before, for 40m and that works fine.  It’s possible I’ve wound something wrong but a visual check doesn’t show that and the turns aren’t shorting out to the ferrites as far as can be tested.  It could be I’ve made a fundamental error somewhere in the build.