Regarding the TR-3 Crystal Filters:
I have used and compared the "soup can" and the little dual - unit filter
sealed filter in TR-3's. I believe the little dual-unit filter is noticeably
better.
I sent in a description to the Drake reflector about a year back or so on
how to replace the TR-3 filters with a pair of the Harris 9 Mhz filters. I had
been getting the Harris filter pairs from several fellows who were pulling them
out of the RF-230's I believe. These filters are small but very good, supposed
to be 8 pole units. Years ago ( back in early 90's) I bought some 9 Mhz filter
pairs from an ad in Electric Radio. They were sealed in plastic bags in USB,
LSB pairs. There was a spec sheet for each filter. When I looked closer at
these they are in fact the same filters as used in Harris units.
Take Care,
Byron
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