[TenTec] Corsair dying on TX- help, hints, please

[Jerry M Judy]

could be the small diodes on the SWR noard.....
----- Original Message ----- 
From: "j_r_abercrombie" <j_r_abercrombie at yahoo.ca>
To: <tentec at contesting.com>
Sent: Monday, March 27, 2006 12:21 PM
Subject: [TenTec] Corsair dying on TX- help, hints, please


> An eBay buy, it worked OK for a day or so, and I made
> a few QSOs on 20m SSB with it. 
> Then it started showing 'funny' behaviour on TX. (All
> symptoms below are with radio in the "lock"/tuneup
> position, into a Cantenna-type 1kw dummy load. All the
> cabling, dummy, power supply etc work fine with a
> TenTec Omni here, so I'm quite sure it is the radio-
> not a PS, or cabling problem).
> First, intermittent, pulsing-type draw on the power
> supply 15-20A range when putting out full power in the
> 'lock' position. Drive control advanced till ALC lit.
> This evolved into output power dropping down to a few
> watts after 30 sec or so of TX. 
> 
> Now, whenever the drive control is advanced to give
> more than a few watts of output power (Ic of 3 amps or
> so), the radio shuts down completely. Power off-power
> on and RX is fine again, but TX still shows the same
> symptoms.
> 
> I don't know if this is something in the SWR sensing
> board, or in the RF PA or what. Should I be looking
> for a blown cap? My expertise is generally limited to
> simpler repairs.
> 
> I'd appreciate any ideas/advice on this. The rig is
> probably not worth shipping (from Canada) to TN for
> repairs, but it seems too nice to become a 'parts rig'
> just yet.
> Thanks.
> 73
> John
> VE7JAV
> 
> 
> 
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