[Elecraft] Birdy on 28020 with K2?

[Tom Hammond]

For what it may be worth, if you have an older KPA100 (not sure what 
'vintage' actually qualified it as 'older' though, mine's as old as the 
come... an FT unit from before they hit the streets), but there is a mod 
(available from me, and I think somewhere on the Elecraft web site) to help 
eliminate, or at lease significantly reduce spurs from the KPA100 HV 
oscillator. Once a couple components. I have the illustrations for the mod, 
but NOT spare parts.

Just ask.

73,

Tom    N0SS


At 02:50 PM 1/2/05, Tom Althoff wrote:
>Yes..its the HV osc...I can make a theramin out of the diode/capacitor
>strings.   Sadly..there is no trimmer cap that I can tweak.  But lowering
>the power to get the KPA-100 to drop out kills the birdy which is fine in a
>pinch if there is a new country ... Like the 5T5 that has been hanging out
>on 28020.
>
>73 de Tom K2TA
>
>----- Original Message -----
>From: "Tom Hammond" <n0ss at earthlink.net>
>To: "Tom Althoff" <althoff at verizon.net>
>Sent: Saturday, January 01, 2005 10:34 AM
>Subject: Re: [Elecraft] Birdy on 28020 with K2?
>
>
> > Tom:
> >
> > >I'm getting a birdy near 28.020MHz with my K2/100.   Is there anything
> > >that can be done to eliminate this or move it a few kHz?
> >
> > Does it go away if the KPA100 is not powered up (e.g. DC removed)? Might
>be
> > the HV osc (PIN diode blocking voltage osc.) in the KPA.
> >
> > If so, it can probably be MOVED elsewhere... maybe significantly reduced
>as
> > well.
> >
> > Tom   N0SS
> >
>
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