Re: [Repeater-Builder] UHF Micor (mobile) spur - conclusion

2005-07-04 Thread Paul Kelley
BTW: Which sticks are you in? I'm in EC Indiana, with an SA that I could loan. A kind offer, thanks. Different sticks though... I'm in central Maine, geographically speaking (that's northern Maine to most of the world :-) Paul Yahoo! Groups Links * To visit your group on the web, go

RE: [Repeater-Builder] UHF Micor (mobile) spur

2005-07-04 Thread goldberg . neil . h . 2
Title: RE: [Repeater-Builder] UHF Micor (mobile) spur Paul, A spur is ususally produced by multiplier circuitry in the transmitter. I would retune the exciter and pay special attention to the position of the slugs prior to retuning. Second you might just have a defective exciter board. Most

[Repeater-Builder] UHF Micor (mobile) spur - conclusion

2005-07-03 Thread Paul Kelley
Joe was right. I feel like an idiot! But this experience served as a very effective reminder... I doubt I'll be making this mistake again any time soon. :-) Service monitors and spectrum analyzers don't live out here in the sticks. So when I had reports of a spur I dragged out my

Re: [Repeater-Builder] UHF Micor (mobile) spur - conclusion

2005-07-03 Thread Dave VanHorn
So it turns out to be the best kind of problem: someone else's. I'm not sure what we're going to do now... at least one person will be adversely affected unless I change repeater frequencies (AGAIN - long story) or he gets a different radio. At least now I can get these Micors off my test

Re: [Repeater-Builder] UHF Micor (mobile) spur - conclusion

2005-07-03 Thread Dave VanHorn
Service monitors and spectrum analyzers don't live out here in the sticks. BTW: Which sticks are you in? I'm in EC Indiana, with an SA that I could loan. Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe

Re: [Repeater-Builder] UHF Micor (mobile) spur

2005-07-02 Thread Paul Kelley
So, no one here has ever run into this before? Really??! I found and tested a third radio... same problem. To restate what the problem is: Micor mobile UHF T34... when running in the ham band transmit low / receive high they are spurring 910 kHz above the transmit freq. I don't know what

Re: [Repeater-Builder] UHF Micor (mobile) spur

2005-07-02 Thread Eric Lemmon
Paul, Have you tried using a different instrument to view this spur? Some spectrum analyzers and service monitors create an artifact of the viewed signal, due to some unintentional internal mixing. When three different radios exhibit the same oddball symptom, I'd suspect my test equipment or

Re: [Repeater-Builder] UHF Micor (mobile) spur

2005-07-02 Thread Glenn Little WB4UIV
Paul 910 Kc is twice the 455 Kc IF. Possibly there is a clue here. Motorola had problems with spurs in the Metrum VHF ham transceiver. It also used one crystal for both transmit and receive. I guess that this is a good data point as to why mobiles should not be used as repeaters. The repeater

Re: [Repeater-Builder] UHF Micor (mobile) spur

2005-07-02 Thread Ken Arck
At 10:39 AM 7/2/2005 -0400, you wrote: So, no one here has ever run into this before? Really??! To restate what the problem is: Micor mobile UHF T34... when running in the ham band transmit low / receive high they are spurring 910 kHz above the transmit freq. I don't know what would happen

Re: [Repeater-Builder] UHF Micor (mobile) spur

2005-07-02 Thread Paul Kelley
Eric, Thanks for the reminder never to trust a single instrument too much. This spur is verifiable though. It can be heard on the air when the Micors are running into an antenna, up to at least 5 miles away if it is a true line of sight path and there is some antenna gain at both ends. And

Re: [Repeater-Builder] UHF Micor (mobile) spur

2005-07-02 Thread Paul Kelley
Thanks Glenn. When I first noticed the 910 kHz relationship, 455 IF was the first thing that popped into my mind... until I realized the Micor doesn't have a 455 kHz IF. Darn, another good theory ruined... Since I have 3 similar radios exhibiting exactly the same problem I am thinking this

Re: [Repeater-Builder] UHF Micor (mobile) spur

2005-07-02 Thread Paul Kelley
On Saturday 02 July 2005 11:57 am, Ken Arck wrote: ---My first reaction is to ask..how are you driving the xmtr, audio wise? Did you bypass the limiter/filtering? Thanks Ken. The spur is there even without audio. But no, I'm not bypassing anything... controller audio is fed to the

RE: [Repeater-Builder] UHF Micor (mobile) spur

2005-07-02 Thread Richard
, July 02, 2005 7:39 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] UHF Micor (mobile) spur So, no one here has ever run into this before? Really??! I found and tested a third radio... same problem. To restate what the problem is: Micor mobile UHF T34... when running

Re: [Repeater-Builder] UHF Micor (mobile) spur

2005-07-02 Thread Dave VanHorn
At 11:33 AM 7/2/2005, Paul Kelley wrote: Thanks Glenn. When I first noticed the 910 kHz relationship, 455 IF was the first thing that popped into my mind... until I realized the Micor doesn't have a 455 kHz IF. Darn, another good theory ruined... Since I have 3 similar radios exhibiting exactly

Re: [Repeater-Builder] UHF Micor (mobile) spur

2005-07-02 Thread Joe Montierth
--- Glenn Little WB4UIV [EMAIL PROTECTED] wrote: Paul 910 Kc is twice the 455 Kc IF. Possibly there is a clue here. Motorola had problems with spurs in the Metrum VHF ham transceiver. It also used one crystal for both transmit and receive. I guess that this is a good data point as

Re: [Repeater-Builder] UHF Micor (mobile) spur

2005-07-02 Thread Paul Kelley
Comments threaded in... On Saturday 02 July 2005 01:19 pm, Joe Montierth wrote: I have used lots of Micor mobiles as repeaters and never seen this problem. Thanks Joe. How far down is the spur from the TX carrier? About 80 dB give or take a bit. My thought is that the 910KHz is too

Re: [Repeater-Builder] UHF Micor (mobile) spur

2005-07-02 Thread Dave VanHorn
I just checked all the radios I've been using to monitor this spur in-house and all *do* have a 455 kHz IF. I will have to check the others which may take a day or two. Let me also see if I can find a receiver which does *not* use a 455 kHz IF to check it with. The second best kind of problem

Re: [Repeater-Builder] UHF Micor (mobile) spur (more test results)

2005-07-02 Thread JOHN MACKEY
was a solid state PA deck!!) Obviously, this has noting to do with the subject but is a fun story. -- Original Message -- Received: Fri, 01 Jul 2005 06:54:32 AM CDT From: Paul Kelley [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] UHF Micor (mobile) spur

Re: [Repeater-Builder] UHF Micor (mobile) spur (more test results)

2005-07-02 Thread Dave VanHorn
Obviously, this has noting to do with the subject but is a fun story. I've got one that I'm trying to track down.. A local 2M machine, on 146.730, is having a problem we call the horrible noise. I've never heard anything like it, and I've had no success at recording it. It sounds like some

Re: [Repeater-Builder] UHF Micor (mobile) spur

2005-07-01 Thread Mike Morris WA6ILQ
At 12:07 PM 6/30/05, you wrote: Aarggh! I've pulled out most of my hair on this one! To revisit something I asked about several months ago... I'm still having a problem with my UHF Micor mobile converted to repeater. It is a T34RTA3000AA with power set at 20 watts. It is on 444.000 (T),

Re: [Repeater-Builder] UHF Micor (mobile) spur

2005-07-01 Thread Neil McKie
See below ... Mike Morris WA6ILQ wrote: At 12:07 PM 6/30/05, you wrote: Aarggh! I've pulled out most of my hair on this one! To revisit something I asked about several months ago... I'm still having a problem with my UHF Micor mobile converted to repeater. It is a T34RTA3000AA

Re: [Repeater-Builder] UHF Micor (mobile) spur

2005-07-01 Thread Paul Kelley
On Friday 01 July 2005 04:56 am, Mike Morris WA6ILQ wrote: One trick that I have used... the far end of the preselector tune broader than the near end. I've found that I get better performance if I do the tuning then turn it around and tune it again. This lets the old far end adjustments

Re: [Repeater-Builder] UHF Micor (mobile) spur (more test results)

2005-07-01 Thread Paul Kelley
I just spent another night poking around in this thing. Sniffing around the transmitter with a receiver and very small probe antenna I am reasonably certain the spur is present at Q305 (exciter mixer) and all subsequent stages. Using a general coverage receiver the fundamental output of the

Re: [Repeater-Builder] UHF Micor (mobile) spur (more test results)

2005-07-01 Thread Paul Kelley
On Friday 01 July 2005 08:43 am, Dave VanHorn wrote: Any possibility that it's coming from the power supply, and not actually the amplifier at all? Do you get it when running from a battery? Good thought. I tried 3 different power supplies and finally a battery. There is definitely

Re: [Repeater-Builder] UHF Micor (mobile) spur (more test results)

2005-07-01 Thread Dave VanHorn
At 08:03 AM 7/1/2005, Paul Kelley wrote: On Friday 01 July 2005 08:43 am, Dave VanHorn wrote: Any possibility that it's coming from the power supply, and not actually the amplifier at all? Do you get it when running from a battery? Good thought. I tried 3 different power supplies and

[Repeater-Builder] UHF Micor (mobile) spur

2005-06-30 Thread Paul Kelley
Aarggh! I've pulled out most of my hair on this one! To revisit something I asked about several months ago... I'm still having a problem with my UHF Micor mobile converted to repeater. It is a T34RTA3000AA with power set at 20 watts. It is on 444.000 (T), 449.000 (R) and is producing a