[Elecraft] K3 Rx IMD

[David Cutter]

Please stay on the list, guys, this is interesting stuff that I'm sure many 
would like to hear more of.

David
G3UNA

> Sorry for being slow to reply.
>
> Oh yes, a coil wound on a core made from "Ferrite" or "Powdered Iron" will
> be a source of IMD products, the culprit being the core. The level of the
> IMD products generated by a core depends on a number of factors, which we
> could discuss "Off List" if you wish.
>
> While I understand Lyle's point concerning the AGC, I cannot shake my
> suspicion that something in or near your antenna is behaving as a mixer, 
> and
> is the source of IMD products. The problem with adding the DDS' signal by
> coupling to the antenna is that you have no control over "unwanted" mixers
> in the vicinity. To disprove (or confirm) my suspicion, my suggestion is
> that you build a hybrid combiner, and use it to inject the BC and DDS
> signals into the K3.
>
> 73,
>
> Geoff
> GM4ESD
>
>
> On Wednesday, November 24, 2010, at 7:59 AM, Ramiro Aceves wrote?
>
>
>> Can the toroid  inside the antenna T tunner
>> be the culprit? Any ideas to test will be welcome.
>
>
>