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
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