Hi Geoff,
thanks for your question. The diplexer that includes an attenuator, does some
stabilization for the filters. The Amplifier still changes impedance as Idss
current is changing due to HAGC action.
No apology, thanks
Best 73
Gian
I7SWX
Da: Geoffrey Mackenzie-Kennedy lx...@pt.lu
A: Giancarlo Moda i7...@yahoo.com
Cc: Elecraft Discussion List elecraft@mailman.qth.net
Inviato: Lunedì 14 Maggio 2012 22:56
Oggetto: Re: [Elecraft] K3 H-Mode Mixer Main Sub RX plus other mods
Hi Gian,
Did you find that your diplexer termination for the filters also prevented the
changing input impedance of HAGC controlled amp Q1 from changing the Group
Delay Variations of the filters, especially the narrower filters?
My apology for not replying to your last email, will explain off-list.
73,
Geoff
LX2AO
On May 14, 2012 at 21:57 +0200, Giancarlo Moda wrote:
snip
Following K3 owners request, a mod relative to a diplexer termination fot
the xtal filters bank is available. This is made to reduce filters IMD due
to change of impedance of the
HAGC Q1 amplifier.
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