K3 sensitivity on 10M

[Dave Hachadorian]

I've had a pair of K3's for a couple of years now, but this past
weekend in the CQWW SSB was their first serious test on 10
meters.  I used the 1.8 filter all weekend, but when I got to 10
meters, I got the distinct feeling that I wasn't hearing enough
band noise. I didn't have the time or equipment to do any
measurements, but I did change the 1.8 filter gain from zero to
four dB, and that seemed to solve the "problem," as I perceived
it.

Maybe I'll go through the filter gain settings again on both
radios, listening to background noise on 10 meters.

If someone has the equipment to do MDS tests on 10, it would
be interesting to see the results.


Dave Hachadorian, K6LL
Yuma, AZ





































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[Barry N1EU]

Dave Hachadorian wrote

when I got to 10 meters, I got the distinct feeling that I wasn't hearing enough
band noise.

I've had the same experience and have commented in the past that I thought the K3 needs to dial in a little extra gain on 10M.  I've resorted to cranking CONFIG Filter Gain to +8dB but perhaps a more elegant solution could be implemented.

73, Barry N1EU

[Jorge Diez - CX6VM]

Well could be possible to improve it (if necessary) for the upcoming ARRL10
contest in December?

I will want to use my K3 in this contest, but with this comments I will try
to compare it in 10 mts with my TS850 I used before

Thank,
Jorge
CX6VM/CW5W

-----Mensaje original-----
De: [hidden email]
[mailto:[hidden email]] En nombre de Barry N1EU
Enviado el: Lunes, 01 de Noviembre de 2010 03:42 p.m.
Para: [hidden email]
Asunto: Re: [Elecraft] K3 sensitivity on 10M



Dave Hachadorian wrote:
>
> when I got to 10 meters, I got the distinct feeling that I wasn't hearing
> enough
> band noise.
>
I've had the same experience and have commented in the past that I thought
the K3 needs to dial in a little extra gain on 10M.  I've resorted to
cranking CONFIG Filter Gain to +8dB but perhaps a more elegant solution
could be implemented.

73, Barry N1EU

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[AC7AC]

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[Ignacy]

Changing from dummy load to 2-el quad increases the noise marginally; about 1-2 db on P3. Definitely not enough gain.

I am not sure whether anything short of increased gain in RF amp would work. Perhaps one can modify the 6m external preamp to work on 10m also.

The low noise made me happy. It means that the power poles are quiet and the neighbors with noisy electronics (plasma TV?) are away.

Ignacy
 

[Ignacy]

OOps. I had the antenna connected via MFJ-1026, so turning on dummy still let the reference antenna in.

After switching MFJ-1026 off, turning from dummy load to 2 ell quad increases the noise level by about 5 db. Enough at this QTH.

Ignacy