Hi, Jim, et.al.: The filter is most likely the Fox Tango GUF-1. If I'm not mistaken, FT sold the rights to their filters to Inrad which has many filters for many rigs available.
>From the part number, my educated guess would be the 6.0-kHz wide, 5645-kHz >center frequency, 8-pole crystal filter. Inrad's p/n is 2611.1; you can get >full spec's at their website (www.inrad.net). This filter is vastly superior >to the 8.0-kHz wide 4-pole design of the original R-4C "roofing" filter. 73, Bob K9JU
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