Batboard

I've got a GR1225 repeater and have the hang-time set to 3 seconds. When I key a portable radio I hear the repeater TX for the 3 second hang-time. Was curious, I TX on another system and the repeater also has a hang-time but only opens the recieving radio's squelch when another radio is keyed. How do I set my GR1225 to hang open but only open squelch while the TX radio PTT switch is pressed?

My two bits worth:
Short answer: you can't.
Long answer: You would need to install an external controller (community repeater, or Multi Coded Squelch) That supports this sort of operation.

I am not familiar with the GR1225, but the basic phenomenon you've encountered is the difference between sending tone with tail and not sending tone with tail.

Your 1225 sounds like it is sending tone with tail, and from the prior response, it appears that this is not a programmable parameter. The other machine you refer to does not send tone with tail.

The trouble with sending tone with tail is that if the participants of a conversation are quick on the draw, the repeater xmitter will not get a chance to shut down and you risk invoking the TOT.

Tone on the tail is normal on the R1225 and on the GR series repeaters. Even the R100. All single user repeaters made by Motorola have been this way.

The R1225 has it built into the firmware and the only way is to add a outboard circuit to 'kill' the tone on the tail. (yes it can be done and does NOT require an external controller)

Also, during the tail the TOT has allready reset, it resets on loss of valid receive, ie;. correct PL or DPL plus carrier.

RKG wrote: The trouble with sending tone with tail is that if the participants of a conversation are quick on the draw, the repeater xmitter will not get a chance to shut down and you risk invoking the TOT.

Funny that you should say that, but the R1225 does reset the timeout timer on loss of RX carrier as indicated in the help section.
I would say that having the tone on the tail has the advantage because it readies the receiver in the radio that just finished transmitting. This would cut down the time needed for decoding the PL from a subsequent transmission provided that the tail isn’t dropped and help in not missing the first syllable in these transmissions.

I never tried this, but it may be possible to use the “strip PL” function on the accessory jack together with the “PL+csq” detect of the correct polarity to actually create a hang time without PL.

Nand.

First, I'm wrong about the TOT, which is usually a function of the power-up signal to the PA and has nothing to do with tail.

(It dawned on my about 0500 this morning that the presence or absence of tone on tail has nothing to do with the length of the tail, and nothing to do with whether the users reply before the tail shuts down. I don't know what was going through my head. I was hoping to edit out my error before someone picked up on it, but I only just now got home.)

Second, the only radios or controllers that I am that into deeply enough to know, all reset their TOT on the shut-down of the PA (or shutdown of the PTT signal), not the loss of COR on the input. However, "hog timers" do work off the input signal. (Whether the hog timer resets or not depends on the circumstances, but what it looks at is the drop of the input.)