Hi from HB9CVQ Andy
My K3S / K3 voltage under load (72W) was 13.1V DC.
-----Original Message-----
From: [email protected] <[email protected]> On
Behalf Of K9MA
Sent: Sonntag, 9. Februar 2020 00:01
To: [email protected]
Subject: Re: [Elecraft] FW: Testing IMD3 (dB) K3S (#10490)
Supply voltage, under load, at the radio?
73,
Scott K9MA
On 2/8/2020 16:14, Conrad PA5Y wrote:
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: [email protected]
<[email protected]> On Behalf Of [email protected]
Sent: 08 February 2020 01:00
To: [email protected]
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
--
Scott K9MA
[email protected]
