On Sun, Apr 25, 2021 at 10:53 AM, ajparent1/kb1gmx wrote:

There is some magical thinking with regard to RD15hhf parts.
RTFM, in this case, the data sheet.

First its a 16V max part.

Can someone explain this? I'm trying to understand maximum values of RF transistors...and the RD16HHF1 datasheets I see don't say 16v anywhere. I see 20v and 50v ratings...and I see things about rules of thumb elsewhere...but how do I determine from the datasheet of an RF transistor what the maximum DC supply voltage is?

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Thanks for any help with my learning!?

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-Nate

N8BTR

On Mon, Mar 24, 2025 at 11:04 AM, Chris wrote:

WSJT-X v2.8.0 20250314 Improved Plus.

so that is not the original WSJTX ? If I am right my verson of WSJTX is 2.7.0 and I could not find, where to see the Hamlib version. I just wonder, if it would not be best tu uninstall what I have and download again.

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Martin

DK3UW

Hi Carol

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Thanks for this observation - I have just uploaded the latest SSB firmware, and done a hardware reset. I was wondering why the QMX+ RTC wasn't updating. Setting "software" mode cured it - update manual please, Hans.

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773

Tony, G3OVH

On Mon, Mar 24, 2025 at 02:31 AM, Chris wrote:

What is the power output during normal CW or digital transmit or Transmit in the diagnostics?

I just did a quick test at 12.0v using Transmit in the diagnostics, all bands are around 5w except 60m this was 6.4w.

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Just to emphasise this is just an observation as some people were have problems with finals whilst carrying out the calibration.

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On Sat, Mar 22, 2025 at 01:27 AM, Yoon KM6KJI wrote:

Anyone tried the internal mic to make a real contact?

My first SSB contact using the devices was over the internal mic, and using my left paddle to "key" PTT.?? It works, but was less than ideal. Currently I am using SSB over the USB audio and running my mic and headphone through my computer while I wait for my digikey order to come in.

On Sun, Mar 23, 2025 at 11:15 PM, mux_folder2001 wrote:

TN0110

What is the highest frequency you are using the TN0110s on?

The current QMX SSB receiver can receive AM because what is transmitted is the two sidebands and a carrier but it's not receiving it as AM, it's receiving as SSB using one sideband of the AM signal and ignoring the other sideband and the carrier.? You don't get the advantages of true AM reception where precise tuning is not required, and you have thrown away half of the data.

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Try it with a rig that can receive SSB and true AM on a broadcast AM signal.? You will see that the AM signal can be received as SSB but you need precise tuning to get the correct tone, with AN you don't need precise tuning and the signal to noise is a little better.

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Chris, G5CTH

WSJT-X is frequently being updated and so is Hamlib.? The WSJT-X installation bundles a current version of Hamlib.

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I found that for a recent version of Hamlib the QRP Labs radios has been changed from one version that handled all QRP Labs radios to separate "QRPLabs QCX/QDX" and "QRPLabs QMX" radios. To add to the fun only the QCX/QDX one worked with my QMX, the QMX one caused WSJT-X to shut down.

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So if you have problems report the exact version and type of WSJT-X and the version of HamLib.? "The latest" isn't good enough, that's only the last one you found.

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Once you find a hamlib version stay with it, and as I said I found that the QCX/QDX version works with QMX, the QMX version doesn't.

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I'm using Hamlib version 4.6.1 2025-01-21T09:43:13Z, WSJT-X v2.8.0 20250314 Improved Plus.

On Sun, Mar 23, 2025 at 04:28 AM, G8JCF wrote:

Hi Dave

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Total respect. HP was the finest company to work for, in my degree course the business part of the course was HP and it's management philosophy which I still absolutely believe in, unfortunately HP today is not the HP I once revered.I

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A different world these days

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That was just a really tiny part of their business but my HP48 calculator my dad gifted me in 1993 as I was studying engineering is still on my desk ! The keyboard can have small faults, nevertheless I fear the day it will die as I am twice as fast using the HP48 rather than a more "modern" calculator and I am the kind of guy who needs to do "back of the enveloppe" calcs. These were competently and truly engineered to last before planning obsolescence was a real thing...

Fascinating. ? ?Would be more so with :

supply voltages that blew them?

power outputs that blew them?

where the BS170’s came from?

how they were mounted?

别迟肠…?

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On Mon, Mar 24, 2025 at 02:02 AM, Paul Devlin wrote:

I did another calibration with a digital SWR/ power meter hooked up, and noticed that the output was 6 watts at times during the calibration.

What is the power output during normal CW or digital transmit or Transmit in the diagnostics?

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AIUI the calibration has to be done over the full range of power output so I would expect it to be the same as normal non SSB transmission.

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Chris, G5CTH

Just an observation re power output when calibrating.

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I did another calibration with a digital SWR/ power meter hooked up, and noticed that the output was 6 watts at times during the calibration.

I was running 12 volts from a bench supply. It isn’t an expensive meter so I accept the power meter may also not be accurate.

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Not sure if this could be a problem in some cases

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Paul.

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I will try to update Hamlib, which until now is a mystery to me. Anyhow I selected TS 440 as? Rig. The funny thing is, that it all worked before.

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Martin

DK3UW

How did you deal with the reverse mounting/heat sink issue? I have purchased a set of those transistors just in case.?

Thanks for quick response?

We see them, Fred.? We ignore them, because the meaning is clear.

I would rather Hans spend his time creating new features than correcting a <1% spelling error rate.

Having said that, yes, one of the first things I try to do is fix grammar and spelling errors in documents I produce.

Stan KC7XE