Re: [Repeater-Builder] Re: Weird Kerchuking Problem
I had a similar problem on my 900 MHz repeater. The site is about 1/4 mile from a much busier site that has a lot of paging, cellphone, and other stuff on it. All it takes is two systems to be off frequency by a hundred Hz or so, and when they cause intermod, the receiver sees that frequency difference as PL, and tickles the squelch. The repeater was being keyed up dozens of times per day. My solution was to use DPL on the repeater input. The repeater is now completely quiet unless it's being used or sending out its beacon every 30 minutes. Not much you can do if you need to maintain a PL tone. Intermod will happen. The frequency tolerance for commercial equipment is going to be a few hundred Hz, so differences in the PL tone range are highly possible. Good luck with your new technical committee duties. Bob M. == --- Scott [EMAIL PROTECTED] wrote: Well, I thought I would bring this saga to a close...it is a paging TX falsing the 141.3 CTCSS tone just enough to kerchuck the repeater. Try any other tone and it is quiet as a mouse! Tried moving it across the room, still to no avail. FYI, the CAT is set up for COR Tone. Since this thing is being tested at a different tower than where it will be, I am going to opt to leave it off for now and when it gets in it's permanent home, hope the tone will work right there. All our other machines, including the privately owned ones, have the same 141.3 tone. It's permanent home is about 15 miles away, and there are no paging TX's there... Thanks for all the suggestions! I sure hate I got into working on repeaters because of the death of one of our club members, but I am enjoying it! (Got 4 of these puppies to keep up, plus 2 APRS digis!) Scott NA4IT __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] Re: Weird Kerchuking Problem
Well, I thought I would bring this saga to a close...it is a paging TX falsing the 141.3 CTCSS tone just enough to kerchuck the repeater. Try any other tone and it is quiet as a mouse! Tried moving it across the room, still to no avail. FYI, the CAT is set up for COR Tone. Since this thing is being tested at a different tower than where it will be, I am going to opt to leave it off for now and when it gets in it's permanent home, hope the tone will work right there. All our other machines, including the privately owned ones, have the same 141.3 tone. It's permanent home is about 15 miles away, and there are no paging TX's there... Thanks for all the suggestions! I sure hate I got into working on repeaters because of the death of one of our club members, but I am enjoying it! (Got 4 of these puppies to keep up, plus 2 APRS digis!) Scott NA4IT --- In Repeater-Builder@yahoogroups.com, Jim B. [EMAIL PROTECTED] wrote: Jay Urish wrote: Change your PL for a few days.. See what happens. Scott wrote: Here's the problem... Every so often (several times in 10 minutes) we are getting a key up of our repeater. Here is what we know... There is no signal coming in on the input frequency. No even a small spike. It is almost like something in the set up is timing and keying, but it is not an exact interval. Doesn't matter is RX tone is enabled in the CAT or not. Here is the setup... Motorola Mitrek trunk mount on 443.275, CAT 250 controller, Com-Spec TS64DS tone board. It has a good 300W 3 can duplexer that is tuned correctly and working well. 75Amp power supply. The cabinet also has an APRS rig in it, as well as a remote receiver for another repeater, and a link radio, but NONE of that is even turned on (and doesn't make a difference when it is). Suggestions as to what to look for...? Make sure you are using COS *AND* PL. The decoder may be falsing on random noise. -- Jim Barbour WD8CHL Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] Re: Weird Kerchuking Problem
Thanks for the suggestions! I will try switching the tone, and as for the COR sense, it takes COR tone. I do hear the courtesy tone when the CAT tone sense is on. Additonal replies welcome! Don't you just LOVE repeaters! I worked on one of our other repeaters yesterday that was throwing a spur. After looking at it on the service monitor, it loked like an upside down comb! It is a low power exciter feeding an amp. What we found was we could sweep the exciter power control and the spurs would go and come. It had two sweet spots the amp liked so we choose the lower one. Now it is happy (and so are the ones who were hearing the spurs!). Everything but the actual TX frequency is down -90db. Maybe that will help someone! Scott NA4IT --- In Repeater-Builder@yahoogroups.com, wn1b8 [EMAIL PROTECTED] wrote: Scott, Are you hearing the courtesy tone when this happens? The absence or presence of the tone could help narrow the possibilities. Also, what provides the PTT signaling for the repeater; tone, cor, or both? Have you tried disconnecting the receiver and checking to see if the problem still exists? Scott Madison, WN1B --- In Repeater-Builder@yahoogroups.com, Scott na4it@ wrote: Here's the problem... Every so often (several times in 10 minutes) we are getting a key up of our repeater. Here is what we know... There is no signal coming in on the input frequency. No even a small spike. It is almost like something in the set up is timing and keying, but it is not an exact interval. Doesn't matter is RX tone is enabled in the CAT or not. Here is the setup... Motorola Mitrek trunk mount on 443.275, CAT 250 controller, Com- Spec TS64DS tone board. It has a good 300W 3 can duplexer that is tuned correctly and working well. 75Amp power supply. The cabinet also has an APRS rig in it, as well as a remote receiver for another repeater, and a link radio, but NONE of that is even turned on (and doesn't make a difference when it is). Suggestions as to what to look for...? Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] Re: Weird Kerchuking Problem
Scott, Are you hearing the courtesy tone when this happens? The absence or presence of the tone could help narrow the possibilities. Also, what provides the PTT signaling for the repeater; tone, cor, or both? Have you tried disconnecting the receiver and checking to see if the problem still exists? Scott Madison, WN1B --- In Repeater-Builder@yahoogroups.com, Scott [EMAIL PROTECTED] wrote: Here's the problem... Every so often (several times in 10 minutes) we are getting a key up of our repeater. Here is what we know... There is no signal coming in on the input frequency. No even a small spike. It is almost like something in the set up is timing and keying, but it is not an exact interval. Doesn't matter is RX tone is enabled in the CAT or not. Here is the setup... Motorola Mitrek trunk mount on 443.275, CAT 250 controller, Com- Spec TS64DS tone board. It has a good 300W 3 can duplexer that is tuned correctly and working well. 75Amp power supply. The cabinet also has an APRS rig in it, as well as a remote receiver for another repeater, and a link radio, but NONE of that is even turned on (and doesn't make a difference when it is). Suggestions as to what to look for...? Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
