Lost Receive Periodically - ZUMspot

Help with DMR issues
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W0PC
Posts: 1
Joined: Wed May 09, 2018 12:58 pm

Lost Receive Periodically - ZUMspot

Post by W0PC »

Periodically, I loose the receive audio. I can see the red transmit light on the ZUMspot and hear the audio on Hoseline... by don't hear it on my TYT MD-380. The receive audio is ok most of the time... just drops out then pops back in. Any ideas? This issuer doesn't happen with my Openspot.
Rick
KB8AOB
Posts: 24
Joined: Tue May 08, 2018 3:42 am
Location: Buckhannon WV USA

Re: Lost Receive Periodically - ZUMspot

Post by KB8AOB »

I have the same equipment but no issues.
Two Questions:

What is the supporting CPU unit? Pi Model???
What is the Amp rating on the power supply used?
kj9b
Posts: 1
Joined: Sun Jul 22, 2018 4:52 pm

Re: Lost Receive Periodically - ZUMspot

Post by kj9b »

I notice similar issues with my ZumSpot. I have noticed this on both my CS750 and MD380. When both radios are side by side, listening to the ZumSpot at the same time, sometimes one will have audio, and one won't. Sometimes one, sometimes the other. Kind of frustrating.
Ken Bandy, KJ9B
K5OZ
Posts: 23
Joined: Wed Apr 11, 2018 1:50 pm
Location: Slidell, LA

Re: Lost Receive Periodically - ZUMspot

Post by K5OZ »

Have found that the MD-380 needs a bit more deviation than other DMR radios. If your DMR TXLevel in mmdvm Host is at 50, up it to about 53 or 54 and you will be fine.


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W6AAX
Posts: 6
Joined: Thu Aug 30, 2018 4:46 pm

Re: Lost Receive Periodically - ZUMspot

Post by W6AAX »

In speaking with Jim, KI6ZUM last weekend, he suggested I post the issue with one these forums. Hope this the right place.
The Motorola XPR7550e DMR HT looses audio/mutes through the ZUMspot after approximately 40 seconds to one minute of receiving a station. Once the station unkeys and the next station starts transmitting, the audio returns but after short while the radio mutes again. Short transmissions seem to be unaffected and no issue through repeaters. Adjusting RX offset in Pi-Star does not fix the issue. No problem when a MD380 side by side with the XPR. The MD380 never loses audio but XPR7550e does once the radio approaches a little less then one minute of receiving.

This is an issue now reported by many users of this radio / ZUMspot combination.
af0mm
Posts: 1
Joined: Sat Jul 21, 2018 3:03 pm

Re: Lost Receive Periodically - ZUMspot

Post by af0mm »

Same issue here, zumspot is on frequency per the service monitor and deviation is within specs.
Radio with problem is Motorola xpr 7550, Anytone receives 100%.
KC9BUH
Posts: 5
Joined: Thu Jun 21, 2018 1:02 pm

Re: Lost Receive Periodically - ZUMspot

Post by KC9BUH »

Has anyone found a solution to the zpr7550 loss of receive audio?

"In speaking with Jim, KI6ZUM last weekend, he suggested I post the issue with one these forums. Hope this the right place.
The Motorola XPR7550e DMR HT looses audio/mutes through the ZUMspot after approximately 40 seconds to one minute of receiving a station. Once the station unkeys and the next station starts transmitting, the audio returns but after short while the radio mutes again. Short transmissions seem to be unaffected and no issue through repeaters. Adjusting RX offset in Pi-Star does not fix the issue. No problem when a MD380 side by side with the XPR. The MD380 never loses audio but XPR7550e does once the radio approaches a little less then one minute of receiving."
Thanks
kc9buh
AF6VN
Posts: 574
Joined: Fri Jul 20, 2018 1:15 am

Re: Lost Receive Periodically - ZUMspot

Post by AF6VN »

Given three users with the same Motorola variant, and no problems with other makes in parallel, one has to conclude there is nothing wrong with the Pi-Star system. Detailed studying of the Motorola manual and programming software, or directing queries to Motorola itself, may be required.

For those with multiple radios -- what happens if you configure both in "talk around" (simplex mode) and just PTT from one radio to the other? Does the Motorola still time-out when receiving direct from, say, an Anytone radio, without using the hotspot? (Actually, given that hotspots normally run half-duplex using a single frequency, the radios might talk to each other if one turns off the hotspot).

--
AF6VN
Dennis L Bieber
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