[R-390] Seeking Advice: First Contract Number IF Deck

[David Wise]

FWIW, Motorola 363-PH-54 is likewise fixed-tuned.  I did not convert to trimmers.


Dave Wise

SWL in Hillsboro

________________________________
From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> on behalf of Jacques Fortin <jacques.f at videotron.ca>
Sent: Tuesday, February 02, 2021 11:15 AM
To: David Wise
Cc: Collins R-390 HF Receiver List
Subject: [R-390] Seeking Advice: First Contract Number IF Deck

Hi to all,

I do not know how much "First Contract Number" Collins R-390A (14214-PH-51)
are still in existence, but they came with an IF deck having no tuning
adjustments for the input / output of the mechanical filters.
Selected fixed capacitors values were used instead.
Does it worth to modify this deck to use trimmers, like in the following
versions ?
How can I be sure that the original fixed capacitor values originally
selected are still the right ones ?

73, Jacques, VE2JFE in Montreal

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