I bought a new IC9700 for my station.
Not going to use it for eme, so all good...I thought. But I want to use
a remote preamp with a transfer relay, so I built that (IC9700 provides
no separate Rx antenna input.
But then I realized that when I push PTT on the mic in FM the radio
immediately transmits RF. It has no Tx Inhibit function like my K3 has.
So "apparently" I can key external equipment via the ACC jack (which
"again apparently" requires an 8-pin DIN jack) pin-3. I have a
sequencer that the external "Send" line can control. And my sequencer
does four stage change-over from Rx to Tx: 1-powers off the preamp,
2-engages TR relay, 3-keys amplifier PTT, 4-turns off Inhibit (which is
a +5v level for my K3).
Only reference to ALC in the IC9700 Basic Manual is page 13-1 showing
the jack pin-out. ALC is shown -4v to 0v with 10K input impedance. How
do I generate -4v from my +5v inhibit voltage regulator? Can I just
reverse the connections or do I have to find a negative voltage
regulator? I'm hoping (no instructions from Icom on how to use ALC in
the manual, and googling reveals nothing) ALC = -4v means minimum RF
output (would -5v hurt the radio?).
Also one on-line reference mentioning adjusting the Tx keying delay
(How?). Not mentioned in Basic Manual, Advanced Manual, or Service
Manual. You don't know what I want to do to Icom's technical manual
dept. Worst (almost) manual I have ever read (I had a job as tech
manual writer once upon a time, so that is my expert opinion).
I figure these issues are not new to those using the IC9700 (BTW I have
the Bonar board and a 49.152 MHz PLL on its way to me to fix the
frequency stability issue).
Ed - KL7UW
Morning operation only over the weekend due to minimum Azimuth 190 deg min
elevation 24 deg due to trees. Totally blocked by a tree to VK, even at
perigee.
25W 1.1m offset
I can work a well set-up 1.8m dish on digimodes, and at a scrape, 1.5m at
perigee.
Happy to try with anyone, big or small, CW or digi
Still looking for my first CW 3cm EME QSO.
It could be you!
email me for skeds
73
John
DUBUS EME contest BEST!
30 июня 2021, 20:39:44, от moon-net-request(a)mailman.pe1itr.com:
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Today's Topics:
1. Re: Problems with sequencing preamps.... (Vladim?r Petr??lka)
2. Re: [Moon] DUBUS CW EME Contest (vlada)
3. Re: Problems with sequencing preamps.... (Ed Cole)
4. Re: Problems with sequencing preamps.... (cx2sc.base(a)gmail.com)
----------------------------------------------------------------------
Message: 1
Date: Wed, 30 Jun 2021 13:17:26 +0200
From: Vladim?r Petr??lka <ok1vpz(a)seznam.cz>
To: <moon-net(a)mailman.pe1itr.com>
Subject: Re: [Moon-Net] Problems with sequencing preamps....
Message-ID: <C7A18C9BC87D458B82695D60F77BC1FC@VPZ>
Content-Type: text/plain; charset="iso-8859-2"
Probably the best solution is simple use of separate RX cable from LNA to RX
http://www.ok2kkw.com/00003016/sequencer/sequencer_2en.htm
LNA is always terminated by relatively long thin cable with higher
attenuation on frequencies above the band.
73 de OK1VPZ
www.ok2kkw.com
-----Original Message-----
From: Moon-net [mailto:moon-net-bounces@mailman.pe1itr.com] On Behalf Of
moon-net-request(a)mailman.pe1itr.com
Sent: Wednesday, June 30, 2021 12:00 PM
To: moon-net(a)mailman.pe1itr.com
Subject: Moon-net Digest, Vol 528, Issue 4
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When replying, please edit your Subject line so it is more specific than
"Re: Contents of Moon-net digest..."
Today's Topics:
1. Re: Using ALC in the IC9700 to delay RF (Ken Arck)
2. Problems with sequencing preamps.... (Marshall-K5QE)
3. Re: Problems with sequencing preamps.... (John Kludt)
----------------------------------------------------------------------
Message: 1
Date: Tue, 29 Jun 2021 17:06:26 -0700
From: Ken Arck <ken(a)arcomcontrollers.com>
To: moon-net(a)mailman.pe1itr.com
Subject: Re: [Moon-Net] Using ALC in the IC9700 to delay RF
Message-ID: <202106300006.15U06SFJ012078(a)r300b.itr-datanet.com>
Content-Type: text/plain; charset="us-ascii"; Format="flowed"
At 04:30 PM 6/29/2021, you wrote:
>Content-Language: en-US
>Content-Type: multipart/alternative;
>
>boundary="_000_CH2PR07MB81077C01213E8D0ED1CCF281E7029CH2PR07MB8107namp_"
>
>My IC-7100 has a Tx delay function that can delay Tx by up to 30ms.
>It's in the SET -> Function menu under "Tx Delay". I'd have though the
>IC-9700 might have something similar.
>
>I<-----Either doesn't work in FM mode or 30 ms isn't long enough as I
>took out my masthead preamp the first time I keyed in FM mode
Ken
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