[ICOM] re:IC761 and PSK

[Igor Sokolov]

Alan, I am using IC765. On PSK it is driven by SB16 output through the ACC
input of the radio. All I have in between the SB and IC765 is 1:1 isolating
transformer. Windows mixer is used to ajust the output level of the  SB16
card.  I do not know anything about Realtek AC97 but I think there should be
more then enough audio at the speaker output of the card. Why don't you try
to measure the output of the card across the 100 ohm resistor and see if it
can be set at around 100 mv using Windows mixer. It can be done with any
oscilloscope or high impeadance voltmeter. If for some reasons it is too low
(wich should not be the case if there is enough audio to drive loudspeakers)
you could use 1;3 or 1;4 audio transformer. But I would rather change the
card in that case. If there is enough voltage at the audio output I would
look for a problem in the radio. But first make sure you are using the
correct pin on the ACC socket of the radio.

73, Igor UA9CDC
----- Original Message -----
From: "zl3kr" <zl3kr at ihug.co.nz>
To: "Icom" <icom at mailman.qth.net>
Sent: Tuesday, December 27, 2005 9:59 AM
Subject: [ICOM] re:IC761 and PSK


> I have been working at finding a solution to my problem of not being
> able to drive my IC761 from the Audio card on PSK.
> The Maximum poer out I can get is approx 7 watts with RF power
> control at Max and audio output from the Realtek AC97 audio card
> also set at Max. I am driving a Rascal GLX with the gain set at Max on
> that as well.
> Although I am not happy doing it at present I have to switch in the
> Speech Compressor and adjust the Power control on the IC761 to about 30
> to 40 watts. I know it is not recommended but it is the only way I can
> get a useable output power and so far all reports suggest that
>   the signal is clean(which is a big relief).
> Looking at the ciruit diagram of the IC761 I am unabe to see where the
> audio line from the accessory Jack ACC1 enters the rigs audio cct
> but it does come in after the Mic gain control as that has no effect
> on the adjustments. I was looking to see if there possibly may have been
> a pad in the audio line.
> I have considered possibly trying  another audio card in the computer
> although I dont want to have to go thru all the necessary messing around
> to remove and install the cards if it is not nexessary.
> I would appreciate any suggestions or comments that anyone cares to make,
> although at this stage i would prefer to remain hooked into the
> accessory jack rather than mess around building something up to bring it
> in through the Mic jack.
> I am hoping that somone else may have run into a similar problem
> and with a lot more knowledge than me found a solution( I know its a
> little late for Santa but a guy can hope cant he )
> I have had quite a few good contacts both on 20mtrs and 10 mtrs since I
> got set up a couple of weeks ago.
> Alan ZL3KR
>
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