Dick,
> I am wondering if that close lightening strike killed
> my sound card or what ever ?
The soundcard has nothing to do with PTT. Since you indicated that you
could operate successfully by switching the transceiver into transmit
using the Auto/VOX switch on the RB+, I seriously doubt that you have a
problem with the soundcard.
> I think I did this correctly. I unplugged the Foster plug from the
> Mark-5 and tested as you described.
The first thing to check is the PTT signal from the computer serial
port. MMTTY indicates PTT by pulling the RTS line (pin 7) and DTR
line (pin 4) high (> +5V). N1MM Logger generally passes both DTR
and RTS through when you have configured the MMTTY port as "digital."
Some of the other software you list (MixW, etc.) only raises the
RTS line.
You need to determine why the RB+ no longer operates PTT is Auto
mode ... Start with the computer serial port. Once you know that
DTR and RTS are changing from low (Off ... less than -5V) to high
(On ... greater than +5V) when MMTTY switches from receive to
transmit, you can move into RB+.
In RB+ you have the jumpers ... make sure they are set correctly
(since RB+ was working before the lightning, they should not have
changed). Then watch the DTR and RTS LEDS when you transmit with
MMTTY ... do they light up when MMTTY goes into transmit? Next
measure the voltage at pin 1 of U1 ... is it at least 5 Volts when
MMTTY is transmitting?
If pin 1 goes to +5V or so when MMTTY is transmitting, look at D3
and D10 in the RB+. Is D10 on all the time? That shows power to
the RB+. Does D3 turn on when MMTTY is transmitting? that shows
that the output of U1 is "closed" and RY-1 should activate (PTT to
the radio). If D3 does not light, check pin 5 of U1 to see if +12V
is present when MMTTY is in receive and that pin 1 goes to 0V
(ground) when MMTTY goes into transmit.
73,
... Joe, W4TV
On 8/25/2010 8:54 PM, Dick White wrote:
> Joe,
>
> I think I did this correctly. I unplugged the Foster plug from the Mark-5
> and tested as you described.
> Checking pins 5/6 - 5/4 - 5/7 I do not get any response on the volt meter.
> Plugging the Foster plug back into the Mark-5 and testing the same pins on
> the RB+ I get the readings you described. I tried every combination 3 or 4
> times and no response. I am wondering if that close lightening strike killed
> my sound card or what ever ?
>
> Thanks for helping me Joe... Dick KS0M
>
> -----Original Message-----
> From: Joe Subich, W4TV [mailto:lists@subich.com]
> Sent: Wednesday, August 25, 2010 2:30 PM
> To: rtty@contesting.com; whiter26@sbcglobal.net
> Subject: Re: [RTTY] need help
>
> Dick,
>
> RB pins 5/6 are defined by your jumpers. I'm referring to
> the "Foster" (round) mic plug that connects to your Mark V
> Field. On that connector pin 5 should be ground (chassis)
> and pin 6 should be the PTT line.
>
> To start with, you should determine if the serial port that
> provides PTT to the RB+ is providing voltage less than -5V
> in receive and more than +5V in transmit on pins 4 (DTR)&
> 7 (RTS) - the reference point is pin 5 (ground). That is
> the way MMTTY/N1MM Logger communicate T/R switching to the
> RB+.
>
> The first step is to determine if you have the correct signals
> coming from your computer. If those are correct, then you
> need to determine why the RB+ is not working correctly in
> "Auto" mode.
>
> 73, ... Joe, W4TV
>
>
>
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