General discussions indicate a higher supply voltage, approaching 14.0
to 14.3 at the radio during transmit, does produce lower IMD products.
On the opposite side, lower voltage has been shown to produce higher IMD
products.
The KPA3A is a Rev E in my radio. The supply voltage as shown on the
radio during 100 watts transmit is 13.9 with 14.3 at the supply. I've
not measured the IMD.
73
Bob, K4TAX
On 2/7/2020 6:00 PM, hb9...@hispeed.ch wrote:
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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