[ICOM] ICOM_746PRO_ALC_PROBLEM
Alan Zack
k7acz at cox.net
Thu Apr 12 22:34:43 EDT 2007
I had the same problem using a 746PRO and an Ameritron AL80B amp. Seems
there must have been a mismatch between the 746PRO and the amps input
circuits causing the internal tuner to do a quick (or maybe false) load into
the amp, even with the 746's TUNE button turned off. The cure was to read
the manual on how to tune the input circuits for each band. In the case of
the AL-80B there are holes in the rear panel marked for each band, insert
the tuning tool and tweak for minimum SWR shown on the 746's meter with the
internal tuner turned off.
______________________________________
Alan Zack
Amateur Radio Station K7ACZ
Official USCG Auxiliary Comm Station
Las Vegas, Nevada, USA
Delta Rocket Quality Engineer, The Boeing Company, Retired
Aviation Chief Warrant Officer, U.S. Coast Guard, Retired
----- Original Message -----
From: "George" <goofyham at highstream.net>
To: "Icom Mailman" <icom at mailman.qth.net>
Sent: Thursday, April 12, 2007 4:25 PM
Subject: [ICOM] ICOM_746PRO_ALC_PROBLEM
A friend asked me to help him try to find out why his 746PRO ALC cuts off
his SSB transmission for the first second or two while the ALC drops down
from 100%???
This only happens when we have it running into his Ameritron AL811 amp???
This does not happen when we hook up his backup 746-non pro rig???
The ALC on the pro seems to have a very slow decay time as compared to the
non pro 746. Why does the pro ALC jump to 100% intermittently when used with
the amp. It's very annoying to say the least and rendered it useless.
Has anyone else experienced this?
thanks.
George W2YJ
----
More information about the Icom
mailing list