Hello Garth:
I hope that you have already found a solution.
If the FT990 is built like a FT1kD, then the LPF is at the top of the chassis
and centrally located. Look for small coaxial cable for Rx antenna connection.
Within this canned module are a slew of relays that are used for switching
in/out LPF for the selected bands. I think that 15m and 17m use a common band
pass section. Trace the connector plug voltages to determine which filter
select relays
are keyed together.
Good Luck,
73s and Have Fun,
de ~ Vince ~
WA2RSX IOTA NA-026
Garth wrote:
> My Ft-990 has devolved a problem. It will not transmit on 15 or 17 meters.
> Receive is fine. Also, other bands are all OK. I spoke with Yeasu tech
> support and they mentioned the 'LPF" assembly but stated that this was beyond
> the scope of telephone support. I guess this is the Low Pass Filter assembly?
> Anyone have any experience with this? Can someone tell me where the LPF is
> located in the unit.
>
> Thanks
> Garth, KW4MM
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