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I don’t know about the balanced TR-3 filters, but the unbalanced TR-4 filters are 120 ohms.

R-4C plug-in filters are 50 ohms.

I believe T-4XC filters are 500 ohms.

Rob, NC0B

On Apr 11, 2024, at 7:51?PM, Stan Gammons via groups.io <buttercup11421@...> wrote:

?Hi All,

I was wondering if anyone knows the impedance of the IF filters used in
the 4 line transmitters and receivers? A search of this group seems to
indicate the TR-4 has 2,000 ohm impedance filters, TR-3 has 500 ohm
impedance filters. What about the receivers?

I emailed John Kriner to see if he knows, but he wasn't able to help.
John said he was sure he had a list of the impedances but he couldn't
find it. I asked Noble Radio to see if he knows, but haven't heard back
yet.


73

Stan
KM4HQE