[ACARS] Re: ACARS - No Luck Here

[roger preston]

Mike L wrote:
> 
> Hi Roger, & All
> Was interested in your reply to Subin Jacob, especially :-
> "It's a direct output on the HF225 radio so the signal can go into the
> Mic socket on the sound card"
> Didn't you mean the Line In socket???
I was wondering about that.... I have plugged the microphone in to the
red socket (sockets go black, red, green black) and I swapped it for the
lead from the radio. Hmmmm.
> The Record Out on the HF225 is a 350mV p-p signal while the Mic In on a
> soundcard is designed for approx 1mV input. Many shortwave RX's have a
> "Record Out" level of 1000mV p-p.
> I'm just beginning to wonder if part of this "No Luck" problem with HFDL
> is being caused by applying this level of signal into the Mic Sockets of
> soundcards, must be a lot of fried input trannies about!!!, as the
> circuits I have indicate that the input level control for the Mic comes
> AFTER the first tranny - so does not protect it, and it certainly won't
> like 350 - 1000 times its rated input stuffed up its backside.
Yes - I fully appreciate what has occurred.
> Anybody got the input circuit diags for the AWE cards I can have a look
> at?, or the chip numbers.
I'll have to find the box the sound card came in and have a look. 
Roger