Stan, if the 288 filter is plugged into your 9MHz i.f. board, remove it and
install it properly on the PBT board. That is a 6.3MHz i.f. filter.
73, Barry N1EU
On Sun, Jul 30, 2017 at 6:16 PM, Stan Gammons <s_gammons@charter.net> wrote:
> Hi everyone,
>
> I have an Omni VI I recently purchased and have a couple questions about
> it. It has a 2.4 Khz and 500 Hz filter on the PBT board. The 9 Mhz IF
> board has 2 filters on it as well. But I don't know what bandwidth the
> filters are on the IF board. The filter in the optional filter slot has
> 288 written on top of the crystals. It has 8 crystals on it. I don't see a
> 2XX number on the the other filter on the IF board. It too has 8 crystals
> on it. Aside from sweeping them, anyone know of another way to identify
> what the filters are?
>
> The other question is, is there a common failure that would cause the
> radio to be off frequency? Near as I can tell using fldigi in one of the
> wide PSK modes and tuning to WWV, the radio is off about 20 Hz off on LSB
> and about 40 Hz off on USB.
>
> The PS I got with the radio is a model 960. Over time the voltage from it
> will vary a little according to my Fluke 8842A. Only from 13.8560 to
> 13.8538 or so.
>
> If I deciphered the S/N correctly, the radio was made in Nov 1996. The PS
> S/N doesn't seem to follow standard numbering, so I'm unsure of the age of
> it. So, I don't know if it's time to considering replacing all of the
> electrolytics in the radio and PS.
>
> Any and all help is appreciated.
>
>
> 73
>
> Stan
> KM4HQE
>
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