[Elecraft] Re: FM Broadcast Station Interference

[Sverre Holm - LA3ZA]

I cannot recall that you have reported the effects of the gain controls
of the K2 on the broadcast interference, except that you say that it
varies somewhat with the tuned frequency.

- does it vary as you change the preamp/attenuator settings?
- does it vary with the RF gain or with different XFIL's?
- does it vary as you turn on/off the high current drain option of the
post-mixer amplifier   (optimized intercept point)
- and last does it vary with the AF gain control? (I'm sure it does!)

This will help isolate where the interference enters the K2.

Apart from this one guess could be that RFC11 could pick up outside
interference, see http://www.elecraft.com/Apps/17m_18m.htm point 1 for a
change to a toroid.


73 Sverre



Sverre Holm, LA3ZA
Asker, Norway (59.8N, 10.4E)
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www.qsl.net/la3za