Sorry to be a wet blanket, but from my current standpoint, I'd be grateful to
find just the one spurious signal from the KPA.
I have literally dozens of spurii on all bands that are S2 or greater. Some
read S9+40 and would read higher if the S-meter could indicate that.
They all emanate from
If PC5M's calculations are correct, and these birdies
are caused by mixing products of the 4.9136 MHz IF
crystals in the K2 and the 18.432 MHz bias supply
crystal in the KPA100, and assuming his spreadsheet
calculations are correct, it seems that a crystal at
15.8735 MHz (+ or - about 9.5 kHz)
] On Behalf Of Ben Hofmann K1NT
Sent: Wednesday, December 20, 2006 8:17 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] 10M birdie and other assundries
If PC5M's calculations are correct, and these birdies
are caused by mixing products of the 4.9136 MHz IF
crystals in the K2 and the 18.432 MHz bias
Hi Jules!
I have a temporary workaround that I use...albeit a pain in the butt one.
That birdy seems related to an oscillator in the KPA-100 (HV PS?)..although
Don can be probably be more specific.
I've found that by turning the power level down that the birdy shifts a bit
in
J F wrote:
Just out of curiousity, after spending some time on
10M during ARRL 10, I noticed a birdie around
28.019/20. Is there a way to eliminate this or move it
below 28.000?
Yes, but even I haven't had the guts to implement it.
Replace the diode t/r switch with a reed relay such as the
Vic K2VCO wrote:
Replace the diode t/r switch with a reed relay
I should have specified that I was talking about the t/r switch in the
KPA100, not the QRP K2, of course.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
___
Elecraft mailing
Anyone know if remoting the KPA100 to an EC-2 case reduces the birdie?
--Mike
At 10:32 AM 12/19/2006, Vic K2VCO wrote:
J F wrote:
Just out of curiousity, after spending some time on
10M during ARRL 10, I noticed a birdie around
28.019/20. Is there a way to eliminate this or move it
below
Hi Julius,
If the birdie at 28.019/20 MHz changes frequency when you change the
transmitter power demand from 10w to 10w, then the KPA100's HV Bias
oscillator is involved. Vic, K2VCO, and I had an off list discussion some
time ago about birdies including this one, and though Vic found the
I don't know how reduced it is because I haven't compared it to the
KPA100 as the top lid but it is barely noticeable in my K2 with the
KPA100 in an EC2 unless I have the preamp on. Even then, it is more
a nuisance than a problem unless the signal is very weak.
73,
Mike WA3KYY
At 11:58 AM
Hi Adi,
You could be right. But keep smiling, K2/100 is in hospital here and
doctors are looking at Ostrich, C.Condor and GORILLAS. Patient doing well.
Your information very useful.
73,
GeoffGM4ESD
K2/100 3255
- Original Message -
From: S55M [EMAIL PROTECTED]
To:
Another wierd behavior of the 28020 birdy is that is tunes the opposite of a
normal cw signal and changes pitch in large steps. I wonder if it is a
harmonic of the HV oscillator in the KPA-100 beating with something related
to the main tuning oscillator?
- Original Message -
From: Russ
-Original Message From: [EMAIL PROTECTED] ---
I've wanted to eliminate this for some time since there a lot of cw activity
between 28025 and 28025. My KPA100 is installed on the K2. The birdie
produces about 1 s unit bar with the pre-amp on. Based on Sverre comments,
how do I
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