[Elecraft] FW: Testing IMD3 (dB) K3S (#10490)

[Conrad PA5Y]

I have some comments. 

My TX IMD is even worse and I was not very happy with the advice I got from Elecraft.  I was advised to use the radio in test mode and use an external amplifier.

Periodically I have a complain about it. My 10W PA is also poor even after the FW upgrade that allows additional attenuation to the drive. There are a few of us who discuss this off reflector and it is by no means uncommon.

On a more positive note I must say that the transverter port output is exceptionally good. Its really impressive.

As for the PA IMD, good luck, you will need it.

Regards

Conrad PA5Y



-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of hb9cvq at hispeed.ch
Sent: 08 February 2020 01:00
To: elecraft at mailman.qth.net
Subject: [Elecraft] FW: Testing IMD3 (dB) K3S (#10490)

 

 


Subject: Testing IMD3 (dB) K3S (#10490)

 

Hi 

 

Can anyone roughly confirm IMD3 K3S ? 

 

10W/100W module recently exchanged under Elecraft swap program Rev A (2019).

Testing: Using K3S internal 2 Tone and -60dB power attenuator (50Ohms) , HP 8591E Spectrum Analyzer (Span 10kHz)

 

72W (Tune, LP100A)out into 50Ohm: 

IMD3 (#10490) -->about on 160m 34 dB, 80m 32dB, 40m 34 dB, 20m  26dB, 17m 30 dB, 10m 30dB, 6m 26dB

Yes, all was aligned (TX Gain test) and showing 100 to 90W full power on all bands.

The driving signal to 10W PA (one tone) looked better than 50dBc.

 

I think these IMD3 values are not very impressive. A power amp. would typically further degrade the overall results.

So K3S is rather good for CW but not really good as SSB preference? (I have now also a FTDX101MP)

 

Comparing with K3 (#7848) upgraded myself to "S", but still maintaining the old 10/100W modules.

80m and 20m were better by about 6dB!?

 

The two tones (IMD3 Test Tones) however were in both cases never absolutely identical in amplitude (ca. +/-1dB) on the analyzer.

 

Any comments?

 

Tnx, Cu, vy 73 de Andy

HB9CVQ, DK2VQ, AK4IG

 

 <https://www.qrz.com/db/HB9CVQ> https://www.qrz.com/db/HB9CVQ

 

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