[Yaesu] FT847: 70cm RX path

Mon, 13 May 2002 01:20:58 +0200

Hans

The service manual is available from Yaesu for about $28.

Deon ZR1DQ
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----- Original Message -----
From: "Hans B��l" <[email protected]>
To: YAESU Refektor <[email protected]>
Sent: Saturday, May 11, 2002 10:11 AM
Subject: [Yaesu] FT847: 70cm RX path

Hallo,

is there someone who could explain me, why there are two HELIX filter
branches in the RX chain of the FT847 after the preamplifier.
I did some measurements and could do only an improvement of the passband by
adjusting the "L" or "LOW" branch. I couldn't find any influence which was
worth mentioning on the "H" or "HIGH" branch.

Another mystery is how the impedance matching of the build in 455KHz filter
(CFJ455K)is done? I can't seen any precautions.

And I've also another question: Where could I get the service manual for the
FT847  ? Is there an Internet adress where this manual is stored just by
chance?

Would be realy great got get some answers!

vy 73 Hans, DL9MCC

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