[SignalOne] Milspec 1030 Vox operation

Thu, 31 Jan 2002 15:36:19 -0800

Hi, Graf

I've been looking for documentation for the two 1030C's we have, so far no
luck except to get the ICOM manual.  Perhaps that is the best way anyway.

Have you had problem with hum from the microphone?  I traced it (from the
outside of the transceiver) to the mic plug.  Looks like the PTT line
induces hum into the mic audio in one of the sets we have.

Also have trouble with something in the power supply, the lights keep
blinking on and off.  Looks like a crowbar activating, then the power supply
resetting.  It appears to be a mechanical problem, slapping the top of the
set has settled for a while.  Of course there must be a better remedy.

Any hints would be most welcome, would like to discuss the set with someone
who also has one.

73 de Bill, AB6MT
[email protected]

----- Original Message -----
From: "Graf Ulrich Ulm" <[email protected]>
To: "'SignalOne, Mail'" <[email protected]>
Sent: Thursday, January 31, 2002 5:54 AM
Subject: [SignalOne] Milspec 1030 Vox operation

> Hi Paul and others,
>
> now I finally detected why I got the impression that vox operation of the
> Milspec 1030 gives lower signal output. When I first tested vox mode I
> obviously used my linear amp. Output was much lower when vox was activated
> than in ptt mode. When I tested again some weeks ago everything was fine -
> this tests were run w/o linear. Yesterday I tested again for some other
> reasons and found output to be lower again. After some investigation I
> detected the deficiency. In vox operation the linear relay will not be
> activated! So every time I tested vox w/o linear, operation was perfect
but
> with linear only the 100 W drive level was measuerd - much lower than
> average power with linear.
>
> Now I started to study the circuit diagrams another time but could not
find
> my way through from vox amp to relay. I get the impression that some link
is
> missing. Or that definitions of lines or interconnections change from
board
> to board. Could you - or anybody else - give me a hint on which diagram
I'll
> find the connection from vox amp to the PTT line? And from PTT to (linear
> amp control) relay?
>
> BTW does there exist a diagram for the 1030 with complete power supply
> schematic? I'm missing the diagram showing the power transformer and the
big
> regulator electrolytics. Also I don`t find my way through from the 12 v
> regulator via driver to the big pass transistors. Any hints?
>
> Thanks for your help!
>
> 73 Uli, DK4SX
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