DIYbanter - View Single Post - Ray-49e VHF receiver not receiving

Michael Black[_2_]

On Mon, 24 Oct 2016, wrote:

Nautical VHF radio from Raymarine type 49e, Tx ok but no Rx.
Understand a possible cause might be linked to bad ceramic filters
I've located two ceramic filters marked "CQ M50FW".
Need help to find any information for replacement, as manufacturer,
data sheet, possible replacements type, etc.
Thanks

Why think the ceramic filters are bad?

Inject a signal into that IF, see if it gets past the filters. To double
check, inject after the filters.

Assuming it's old enough to use crystals, why not wonder if the local
oscillator crystal (or any second conversion crystal, if there is one) is
bad or not oscillating? Have you even checked to make sure there is a
crystal for the first oscillator in the receiver?

Michael