I Just checked my Omni VI manual, and the Low Pass filters and bandpass
filters are not shared that way. In other words 20 meters does not share a
lowpass filter with any other band, nor does it share a bandpass filter
with any other band. 17 meters does share low pass filters with 15 meter,
but does not share BPF with 15.
Where 17 meters and 20 meters do share circuits, that are not used by other
bands is in the bandpass filters used by the L.O. Mixer, on the XTAL OSC. -
L.O. Mixer Board. I would look at all connections and parts associated with
D31, D32, D37, D42. If you look at the XTAL OSC. - L.O. Mixer Board
schematic you will see what I mean. Unfortunately that board is hidden
inside a box, underneath other boards. Not easy to get to at all. Start by
DeOxiting connectors you can get to without opening up that box. You may
get lucky.
DE N6KB
On Sat, Aug 12, 2017 at 1:52 PM, Ken Brown <kenradiobrown@gmail.com> wrote:
> Those two bands may share the same bandpass filters. I don't know off the
> top of my head. If they do, I would check to see if the band select control
> logic is getting to the bandpass filter board(s), Whether the control
> voltages look the same on that line as on other band selection lines when
> they are selected, and if the control voltages look good, then you will
> need to see if there is something wrong with the relays, switching diodes
> or the filters themselves. Could be as simple as a connector contact that
> needs to be cleaned.
>
> DE N6KB
>
> On Sat, Aug 12, 2017 at 12:22 PM, Ron Notarius W3WN <wn3vaw@verizon.net>
> wrote:
>
>> It's always something...
>>
>> Just discovered (and I mean just) that I've lost both 20 and 17 meters on
>> my
>> Omni VI+. No receive, no transmit. But only on those two bands.
>>
>> No issues at all on the other bands. Obviously something common to both
>> 20
>> & 17 decided to let the smoke out.
>>
>> Any suggestions on what to look for?
>>
>> 73, ron w3wn
>>
>>
>>
>>
>> ---
>> This email has been checked for viruses by Avast antivirus software.
>> https://www.avast.com/antivirus
>> _______________________________________________
>> TenTec mailing list
>> TenTec@contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec
>>
>
>
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|