MTR-2000 Base Station (Simplex) & Pi-Star

Radio Equipment that can be used in Amateur Radio and where to get them. User support for those little problems that frequently occur and other little issues relation to Radio Equipment
Post Reply
VA3UV
Posts: 45
Joined: Tue Apr 09, 2019 5:02 pm

MTR-2000 Base Station (Simplex) & Pi-Star

Post by VA3UV »

Hi Guys:

Got an MTR-2000 VHF "beast" for a simplex module on my repeater stack - it's setup as a
base station with a TX/RX relay.

I have an issue that I haven't had much time to investigate... I have it
connected to a DVRPTR modem and Pi-Star. Pi-Star is set for simplex
mode. The issue is that when Pi-Star sends the ACK beep, the MTR gets
into a loop chasing itself, keying the TX on and off. This happens on a
dummy load as well!

I thought maybe it might be programmed as a repeater
/ full duplex - BUT - if I disable the ACK in Pi-Star (Set the Mode value in dstarrepeater to 2), the MTR is fine -
whether with local RF traffic or traffic off a reflector, the thing
behaves perfectly, no tail chasing.... I think this confirms that it is
programmed correctly for base station / simplex use?

I tried playing with the txdelay and ACK timing in dstarrepeater - but even with timing values > 500, the problem persists. I'm wondering if the Mode parameter is not being 'respected' when dstarrepeater sends the ACK?

I have the Motorola RSS s/w - just need a darn XP machine to load it on and check
this out.

Any ideas.... anyone have an MTR-2000 and Pi-Star to validate my observation?

Thanks!

Ramesh.
VA3UV / WA3UV / G4PNQ
VA3UV
Posts: 45
Joined: Tue Apr 09, 2019 5:02 pm

Re: MTR-2000 Base Station (Simplex) & Pi-Star

Post by VA3UV »

I think the application here is actually 'Half Duplex' and what I really need is an RXDELAY rather than a TXDELAY.

Does dstarrepeater support such an application?

Thx,

Ramesh.
VA3UV / WA3UV / G4PNQ
Post Reply