[TenTec] Omni 6+ Low Power Troubles

[Mark S. Adams, P.E.]

Guys,

The factory tech last week told me that they have change finals at least 3 
times on the Omni 6. He did say that presently they prefer 458's, and 
always try to replace in matched pairs. He did not indicate whether they 
spec'ed out alternatives.

73,
Mark K2QO

--On Sunday, December 15, 2002 5:54 PM -0500 Gary Hoffman 
<ghoffman@spacetech.com> wrote:

> Al,
>
> I'm not sure about this, but I seem to recall the guys at the factory
> saying that there was no suitable replacement.  If there IS one, I'd
> sure like to know about it.
>
> 73 de Gary, AA2IZ
>
> ----- Original Message -----
> From: <al_lorona@agilent.com>
> To: <msadams@acsu.buffalo.edu>; <randnichols@ghg.net>
> Cc: <tentec@contesting.com>
> Sent: Sunday, December 15, 2002 4:28 PM
> Subject: RE: [TenTec] Omni 6+ Low Power Troubles
>
>
>>
>> MRF 458s have been going extinct for several years now. It gets harder
>> and
> harder-- and more and more expensive-- to find them. You should be able to
> substitute MRF 454's with little change in performance. MRF 454s are much
> more plentiful. I believe I looked into that at one time and confirmed
> that the MRF 454 would be a suitable replacement.
>>
>> One of the other guys with a data book would be able to confirm or deny
> that.
>>
>> Al  W6LX
>>
>>
>>
>> > -----Original Message-----
>> > From: Mark S. Adams, P.E. [mailto:msadams@acsu.buffalo.edu]
>> > Sent: Saturday, 14 December 2002 9:51 AM
>> > To: randnichols@ghg.net
>> > Cc: tentec@contesting.com
>> > Subject: [TenTec] Omni 6+ Low Power Troubles
>> >
>> >
>> > Hi Gang,
>> >
>> > I just called TT about this Thursday as my 6+ is limiting
>> > power on all
>> > bands to 15W. (It is amazing I even notices as I run the rig
>> > at 1-5W about
>> > 99.95% of the time.)
>> >
>> > The service guy said that I should be looking at the
>> > BAT-41diodes on the LP
>> > Filter board as they are likely damaged by ESD. The other
>> > option is the
>> > Motorola power modules. To check these, disconnect the coax
>> > from the power
>> > amp module at the LP filter board. Using a dummy load and
>> > power meter,
>> > start low and raise power. If you get good power, the LP board is the
>> > problem, if not the PA is the likely the problem. Bear in
>> > mind that the PA
>> > will make 150w this way as it is not ALC limited.
>> >
>> > Lastly, TT is having a hard time getting PA's and right now
>> > they are ~$80
>> > for a matched pair at TT.  RF Parts has them listed for
>> > $18/ea but TT says
>> > they are going to be out of stock.
>> >
>> > GL es 73,
>> > Mark K2QO
>> >
>> > Mark S. Adams, P.E.
>> > University at Buffalo
>> > Occupational and Environmental Safety
>> > 220 Winspear Avenue
>> > Buffalo, NY 14215-1034
>> > Tel: 716.829.3707 ext. 25  Fax: 716.829.2704
>> > Cell: 716.863.7229
>> > _______________________________________________
>> > TenTec mailing list
>> > TenTec@contesting.com
>> > http://lists.contesting.com/mailman/listinfo/tentec
>> >
>> _______________________________________________
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>>
>
>
>



Mark S. Adams, P.E.
University at Buffalo
Occupational and Environmental Safety
220 Winspear Avenue
Buffalo, NY 14215-1034
Tel: 716.829.3707 ext. 25  Fax: 716.829.2704
Cell: 716.863.7229