http://elecraft.85.s1.nabble.com/K3-N1MM-for-Field-Day-tp2864853p2866017.html
>
> ----- Original Message ----- From: "Merv Schweigert" <
[hidden email]>
>
>> I started to try and find the problem and using another
>> receiver I find the Astron SS-30 is generating all sorts of noise.
>> I have used this supply for some time and have not noticed the noise
>> before.
>
> Merv,
>
> For weight considerations, the SS-30 supplies were selected for the
> Ducie Island expedition this past year.
>
> This problem you mention, or a very similar one, was evident during
> the VP6DX expedition from the time that Robin started making tests
> while underway on the Braveheart from ZL to FO.
>
> We added extra filtering internally.
>
> We grounded extensively.
>
> We cleaned the case cover screw holes both on the main chassis and on
> the cover to improve bonding to the cover. We were never able to make
> them clean. All supplies performed in the exact same manner.
>
> We were float charging small batteries to keep the K-3s and the
> ancillary equipment running while the gensets were being refueled and
> having oil changed. The extra capacitance of the battery helped with
> the DC filtering but most of the stuff was of a frequency that the
> battery and other filtering could not remove. And we couldn't keep it
> inside the case.
>
> The fact remains that the harmonics of the switcher were a very real
> problem for us, especially on the lower frequency bands. The most
> annoying situation was the harmonic signal moving around, slowly up
> and down the band such that we could not avoid it at times when we
> were in the middle of a tough one on 160 and were trying to dig it out
> of the noise floor. We had to wait until the birdie slowly slithered
> on by or many times I just reached and turned the SS-30 off during a
> difficult contact.
>
> 73 de Milt, N5IA
have done about all that Milt describes and still has noise.
and listening on a Ft-1000D it has a noise floor of S0.
shipping weight etc. Thanks for all the input.