[ICOM] Problem with IC-781 and rising power

[GGLL]

Thank you Adam. Membership is pending.

Regards
Guillermo - LU8EYW.

Adam Farson escribió:
> Hi Guillermo,
> 
> The IC-781 group may also be able to assist you.
> 
> http://groups.yahoo.com/group/IcomIC781/
> 
> Cheers for now, 73,
> Adam VA7OJ/AB4OJ
>  
> 
> -----Original Message-----
> From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
> Behalf Of GGLL
> Sent: 6-Sep-09 11:08
> To: Icom
> Subject: [ICOM] Problem with IC-781 and rising power
> 
> 	Hello, I'm trying to fix a nice 781 with a strange problem. In any
> mode, at any band, after I push PTT for transmit it tooks three to four
> seconds to reach full power (150 watts and whatever power output I set with
> R49). Just the 781 alone, no linear amplifier.
> 	I've traced that at soon I press PTT, the bias for the RF TX
> amplifiers
> (Q32 and Q39) raise from -1.6V upto 3.5V in the above stated time instead of
> being instantaneous at 3.5V. Q30 seems to switch properly also.
> 	I've replaced Q35 which had a small leak, and the ALC system has
> already K1VF ALC mods for the power spike.
> 
> Any hint, advice, is indeed welcome.
> 
> Regards
> Guillermo - LU8EYW.
> 
> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
> To support QSL/QTH.net: http://www.qsl.net/donate.html
> 
> 
> ------------------------------------------------------------------------
> 
> 
> No virus found in this incoming message.
> Checked by AVG - www.avg.com 
> Version: 8.5.409 / Virus Database: 270.13.80/2349 - Release Date: 09/06/09 05:51:00
>