FYI I tried the amp and rig on a large deep cycle battery last night and got
the same results as on the power supply. Also tried some .01ufd caps in the
power leads of the amps and still had same result to try to rule out
RFI....Rusty NE4ME
Today's Topics:
1. Mirage Amp problems (Rusty Boling)
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Message: 1
Date: Sun, 7 Nov 2004 09:01:37 -0800 (PST)
From: Rusty Boling
Subject: [VHFcontesting] Mirage Amp problems
To: VHF CONTESTING
Message-ID: <20041107170137.92603.qmail@web50302.mail.yahoo.com>
Content-Type: text/plain; charset=us-ascii
Having problems with an older Mirage B1016 2M 160W amp for a while now. Getting
reports of distorted audio at all power levels on SSB. Output power is still
good. Distortion still there even with low drive power and low mic gain. Does
not have the problem on FM and I don't know about CW (havent checked that yet).
Driving the amp with a IC-271A usually and occasionally with an IC-706MKII. I
am guessing the amp is 15-20 years old now and the reports of it beginning to
become distorted have happened over the last year or so. I have eliminated low
voltage, RFI (for the mostpart), and poor connection to power supply. I spoke
to K4TO last night and he thinks it could be a bias problem within the amp. The
only thing that I could do to check that was compare readings between the 2
high power transistors. All voltages on the transistors were consistant with
eachother per given power input and output according to my DVM, not that I like
160W on 2M at an armlength away. Anyon
e have
this same problem before and was able to resolve it? I'd hate to resort to
making it FM use only. Any ideas??? Rusty NE4ME
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End of VHFcontesting Digest, Vol 23, Issue 5
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