[1000mp] 1000MP and PSK31 HOW ????

Sun, 20 Jan 2002 20:02:08 -0000

I was just pointing out the need to deal with the microphone in the
suggested configuration, which was not clear from K3GV'sm response. I use a
RigBlaster to achieve that isolation.

Particularly on RTTY, I also combine the Main and Sub audio from the MP's AF
Out jack before driving my RTTY modem, in order to copy both the DX and the
pileup in split (dual) mode, as one would do in SSB or CW by ear. When not
in a split pileup, since the AF outs are full on, independent of the MP
fader control, I exit dual receive mode.

t first, I merely tied the two audio signals together with a wye, but that
creates distortion and crosstalk--the MP AF Outs are emitter followers with
no series resistors. So it is necessary to combine through resistors at a
cost of 6 dB. At present, I get around that by combining the second pair of
soundcard speaker outputs my card (SB Live! Value) provides, which then
drive the RTTY modem, but then that enhancement is not available for PSK.

Garry

> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of Morris Wideman
> Sent: Sunday, January 20, 2002 15:23
> To: [email protected]
> Subject: RE: [1000mp] 1000MP and PSK31 HOW ????
>
>
>  Hi Garry
> No dont turn the mic gain off, you need to disconnect your
> microphone if it shorts out the mic input when not in use
> (receive) most do. Then with your psk in transmit your mic gain
> and sound card output (also leave the power control at full
> out)levels will control the power out of your radio.
> This is where a lot of people go wrong, it only takes a small
> signal from the soundcard (millivolts) to drive the radio, so
> keep the soundcard level low, I use a 10,000 to one attenuator in
> line from the soundcard to radio and still have the soundcard
> levels pretty low. Its very easy to overdrive the mic preamp is
> any radio and once that occurs you have distortion and will be
> transmitting a poor broad signal no matter what power level your running.
> My mic level is about the same as it would be using my mic for
> ssb and that way I know Im not (hopefully) overdriving the radio.
> And with someone where each of your have a good stronge signal
> get a IMD report.
> Good Luck and 73 Morris WA4MIT
> --
>
> On Sun, 20 Jan 2002 05:22:33
>  Garry Shapiro wrote:
> >...and you turn off your mic gain, right?
> >
> >> -----Original Message-----
> >> From: [email protected]
> >> [mailto:[email protected]]On Behalf Of [email protected]
> >> Sent: Thursday, January 17, 2002 20:59
> >> To: [email protected]
> >> Subject: Re: [1000mp] 1000MP and PSK31 HOW ????
> >>
> >>
> >> I connect my "AF" on the back of the 1000MP to the "Line in" of
> >> my sound card
> >> and "speaker" out on my sound card to "Patch" on the back of my
> >> 1000MP. It
> >> works flawlessly.
> >>
> >> 73,
> >> George K3GV
> >>
> >> DX: Long may it live !
> >> If it isn't LOGic it isn't LOGging !
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> >>
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