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World of Ham Radio 1997
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From Unknown Mon Jan 01 01:07:35 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!peer-news.britain.eu.net!yama.mcc.ac.uk!io.salford.ac.uk!aber!bath.ac.uk!bell.ukonline.co.uk!morse.ukonline.co.uk!ukonline.co.uk!david.j2
From: David Johnson <david.j2@ukonline.co.uk>
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Help with Icom 720A on Amtor A.
Date: Fri, 29 Dec 1995 01:13:10 +0000
Organization: (NON)
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Message-ID: <7h4TpLAmC04wEw86@ukonline.co.uk>
References: <4bshcn$mvb@midland.co.nz>
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In article <4bshcn$mvb@midland.co.nz>, UGH <UGH@UGH.UGH> writes
>>ZL1ANY/TPK 1.82 Msg #:259 Date:19-11-95 Time:11:08Z
>>
>>
>> Trying to use icom 720a on amtor mode a.
The IC720a needs a few mods in order to work on amtor.
The following is from the ICOM newsletter 35 of June 83, article by Roy
Philpott DJ0OW, G3VCH.
Quote: All mods are to the main board, easily accessible on the top of
the set. The modification consists of replacing C42 and C43 with 1uF.
Also replacing C40 (1uF) with 0.47uF. This effectivly shortens the T-R
switching, also it is necessary to remove the AF amp mute by placing a
shorting link across C69 (there will be audio present on normal
operation, but it doesn't cause a problem).
I did this mod when I had an IC720a and it worked fine with an AMT-1
terminal on "SSB" mode.
--
David Johnson