Henry uses a broadband input for the 8K that seems to function. It is a
stack of 3 ferrite toroids with Hi bands/Low bands switching. It can be
purchased as an individual part.
As they say, YMMV!
Carl
KM1H
----- Original Message -----
From: <herzog@frontiernet.net>
To: "amps list" <amps@contesting.com>
Sent: Friday, April 16, 2010 9:26 PM
Subject: [Amps] line length magic
> RE:I think that Collins was trying to reduce the total IM products from
> the
> 30S1/KWM2 system when they recommended a specific length interconnect
> cable
> for the RF input to the amp. They make mention of the concern for the
> phase
> of the signal at the plate of the driver and the phase of the signal at
> the
> plate of the amp. I am guessing that the attempt was to have some amount
> of
> cancellation of the total IM products by this.
>
> 73
> Gary K4FMX
> =============================================
> Herzog says: I have noted that a foot of cable could make a total
> difference for a 4 MHz signal. Scope viewing, and etc, showed the
> difference was in the presence of higher frequency harmonics affection
> the tube input.
> The use of a vector impedance meter showed and confirmed the resonance
> at high freq; and how he coax length was changing it. I gave up, and
> just used swamping resistors,like everyone else does. K2LB
>
>
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