Russ -- going to leave your note to me at the top, and post this to a
couple of discussion lists to see if others have seen this behavior. My
reply is below your note.
Russ Crisp wrote:
> Sup Nate.
>
>
>
> Russ here in Cullowhee, NC. Node 4397.
>
>
>
> I’m looking at the readinput utility, and it appears to me that my COS
> state seems to ‘bounce’, for lack of a better description. I’ve got my
> node wired to my GE Mastr II repeater, and RUS is coming over to the
> IRLP board’s COS input. When I key up, COS goes active, immediately
> back to inactive, then just as fast, back to active. Like a switch that
> bounces once.
>
>
>
> Assuming readinput is not at fault, there must be something a little
> funky with the signal the M2 receiver is putting out on the RUS line.
> I’m playing with the CTONE script, and it’s faking it out..
>
>
>
> In all your tinkering, have you ever heard of such?
>
>
>
> What do you say?
>
>
>
> 73’s
>
> Russ Crisp
>
> K4RCC
>
Russ, I'm going to send a copy of my reply to you separately to a few
people who have worked on many MASTR II's, as I've seen EXACTLY the same
thing both with a GE decoder board and also with our modification to use
a TS-64 in the GE station. I've also seen it in a mobile that was
modified to use a TS-64 for transmit and receive tone.
In fact, I installed a GE relay card in a station (well, it actually
came with it installed - I just left it there to listen to it) and can
much more easily listen to it for the "double-hit" on about 1 out of 5
un-keys by the remote repeater on the RUS line, so it's not just the
IRLP board that sees it. It's enough to trigger that relay card too.
That station is set up half-duplex to a full-duplex MASTR II repeater,
on an in-band UHF repeater to house link for IRLP node 3291.
(Both ends are MASTR II's with all stock GE tone boards in them.)
There have also been on and off complaints to another local group that
has a MASTR II VHF in-band link using MASTR II's at both ends that they
sometimes "pulse" Reflectors.
Are you using a tone board in your MASTR II's? That would be useful
information.
I'm starting to think we need to dig into this further -- perhaps
there's something in the RUS circuit that causes this?
I've also seen this when directly connected to a repeater controller, by
watching the COS and CTCSS LED's during un-keys, but just like on my
IRLP link, it's very inconsistent. It doesn't happen on every unkey.
I never see CAS bounce (squelch), and I'm very seriously thinking that I
need to logic AND the two together to get a valid "signal being
received" signal for IRLP. I also wonder if this is the cause of some
other things I've seen.
I think more engineering work needs to be done to find the culprit of
the double-bounce, though. Back when I had the TS-64 installed -- I
suspected that the CTCSS tone was staying on too long from the mountain
after STE (phase-shift) and re-opening the tone board. That still may
be the culprit, but I haven't measured it.
None of the GE user radios (mainly the GE MP/A hand-helds) I use ever
"re-open" when listening to the repeater, so this seems to be a
phenomenon in the MASTR II itself. Once the user radios see the
phase-shift of STE, they stay closed.
Defining it and finding it will be interesting, if I can find the time.
Nate WY0X
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