[TenTec] Omni 6+ Low Power Troubles

[al_lorona@agilent.com]

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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