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Quantar Issue: Random Tx Cutout

This forum is for discussions regarding System Infrastructure and Related Equipment. This includes but is not limited to repeaters, base stations, consoles, voters, Voice over IP, system design and implementation, and other related topics.

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W1HVN
Posts: 417
Joined: Tue Dec 09, 2008 11:46 am
What radios do you own?: MX300 w/DVP

Quantar Issue: Random Tx Cutout

Postby W1HVN » Sat Nov 03, 2012 7:51 pm

Recently a new issue has arisen with a 25 watt VHF with v16 firmware silver Onan unit. This was a Dave in Colorado unit and is used in Amateur Service.

In repeater mode configured for mixed mode and 15 watts output she randomly drops the transmitter. Receiver is working fine however the tx just drops. No re-creatable circumstances which can be identified as a precipitant.

RSS shows no alarms or recordable PA/TX events when it occurs. The TX just drops.
All settings same as previous two years its been running without issue.

Understanding it may be an exciter or PA failure, anyone heard of this or know of any firmware history associated with this problem?

Thanks

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d119
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Joined: Tue Mar 19, 2002 4:00 pm

Re: Quantar Issue: Random Tx Cutout

Postby d119 » Sun Nov 04, 2012 11:52 am

Internal SCM-based controller, or external controller?

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W1HVN
Posts: 417
Joined: Tue Dec 09, 2008 11:46 am
What radios do you own?: MX300 w/DVP

Re: Quantar Issue: Random Tx Cutout

Postby W1HVN » Sun Nov 04, 2012 6:06 pm

All in cabinet internal.

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d119
Posts: 3494
Joined: Tue Mar 19, 2002 4:00 pm

Re: Quantar Issue: Random Tx Cutout

Postby d119 » Sun Nov 11, 2012 12:25 pm

Weird. Have you tried another SCM?

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radioactive69
Posts: 88
Joined: Fri Jul 23, 2004 2:38 pm

Re: Quantar Issue: Random Tx Cutout

Postby radioactive69 » Sat Nov 17, 2012 7:14 pm

Maybe the 25w PA set at 15w is under-driving the Final stage. Is the 15w out of the duplexer or out of the PA direct?
We are in the too much information age...

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chartofmaryland
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Joined: Sat Dec 28, 2002 11:25 pm
What radios do you own?: Alot

Re: Quantar Issue: Random Tx Cutout

Postby chartofmaryland » Fri Dec 07, 2012 9:47 am

Check the power supply voltage,

I had a quantar feeder for a Quantro which went "green" on Tx but was loosing voltage that didn't show as the point of drop was after the monitoring point for the station status. The Exciter would lock, PA Full came up and look happy but made no output.

Power supply failures are not often but do make themselves into a mess when it happens.

Something to check

CoM
If the lights are out when you leave the station and then come on the second you key up, you know you have enough power.


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