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Federal Q causes XTL5000 to transmit

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ve3nsv
Posts: 277
Joined: Sat May 27, 2006 8:43 am

Federal Q causes XTL5000 to transmit

Postby ve3nsv » Thu Jan 12, 2017 11:31 am

I have a customer that has an issue were the XTL5000 (Remote Mount) PTT's when the Federal Q is used. I have narrowed it down to the radio itself as it does have a Firecom attached. I fixed it a few years ago with an inline power filter on the radio but it seem to be acting up again. One of the local Fire truck builders recommended a "switch back solenoid" on the Federal Q. Has anybody heard of this before or experienced this issue?

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jackhackett
Posts: 1402
Joined: Tue Jun 10, 2003 8:52 am

Re: Federal Q causes XTL5000 to transmit

Postby jackhackett » Thu Jan 12, 2017 11:47 am

Could be the vehicle batteries are getting weak, those Qs draw a lot of current.. rated at 100A.

jry
Posts: 320
Joined: Fri Feb 06, 2004 3:14 pm

Re: Federal Q causes XTL5000 to transmit

Postby jry » Thu Jan 12, 2017 11:56 am

I have seen noise triggering through the Firecom as well.

Batteries are a good thought though

ve3nsv
Posts: 277
Joined: Sat May 27, 2006 8:43 am

Re: Federal Q causes XTL5000 to transmit

Postby ve3nsv » Thu Jan 12, 2017 12:11 pm

Unhooking the Firecom radio interface / intercom yielded the same results.

Jim202
Posts: 3483
Joined: Sun Sep 09, 2001 4:00 pm

Re: Federal Q causes XTL5000 to transmit

Postby Jim202 » Thu Jan 12, 2017 12:49 pm

Have you measured the 12 volt line feeding the XTL when the siren is lit off?

Low voltage can cause wired problems.

When you said you unhooked the Fire Com / intercom, are you saying the accessory connector was pulled from the XTL? Trying to see just what is left connected to the radio to help with ideas on your problem of the radio going into a keyed (TX) condition if I am understanding your post correctly.

Jim

ve3nsv
Posts: 277
Joined: Sat May 27, 2006 8:43 am

Re: Federal Q causes XTL5000 to transmit

Postby ve3nsv » Thu Jan 12, 2017 1:11 pm

Hi Jim,

I unhooked the radio interface at the Firecom intercom gateway. I haven't gotten into any deep troubleshooting as of yet. I was just looking to see if anybody else had seen this issue as it's a fairly common setup.

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d119
Posts: 3436
Joined: Tue Mar 19, 2002 4:00 pm

Re: Federal Q causes XTL5000 to transmit

Postby d119 » Thu Jan 12, 2017 6:50 pm

Ive seen a real deal airhorn do this in a fire engine. No solution I've found.

ard099
Posts: 83
Joined: Sun Nov 26, 2006 1:00 pm

Re: Federal Q causes XTL5000 to transmit

Postby ard099 » Mon Jan 23, 2017 11:41 am

Ran into the exact problem with an XTL2500 remote mount. We had the firecom unit wired to the acc port on the control head. Moving the firecom interface to the db25 on the transceiver fixed the problem. I believe Firecom has a special cable to resolve the issue now.

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jackhackett
Posts: 1402
Joined: Tue Jun 10, 2003 8:52 am

Re: Federal Q causes XTL5000 to transmit

Postby jackhackett » Tue Jan 24, 2017 12:03 pm

I would try disconnecting the Firecom cable from the radio end. I don't see how having the cable on there but disconnected would still cause the problem unless the siren was emitting RF, but if you take the cable off completely that should rule out the Firecom. You might also try disabling the PTT input that the Firecom is using in the radio programming if that's possible.

I'm still suggesting to check the vehicle batteries. If a power line filter solved the problem before then it's probably noise on the power feed causing it. Batteries act like a giant capacitor, filtering the DC voltage from the alternator. As they age their internal resistance go up and they don't filter as well, much like a capacitor with a high ESR.

One other thing to consider might be a power line conditioner that filters and adjusts for voltage surges and drops.


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