I should have two in two weeks. ----- Original Message ----- From: <[email protected]> To: <[email protected]> Sent: Tuesday, April 27, 2004 4:41 PM Subject: [Repeater-Builder] Digest Number 2489
> There are 25 messages in this issue. > > Topics in this digest: > > 1. Re: IFR Monitor Repair Charges > From: "kk2ed" <[EMAIL PROTECTED]> > 2. Re: Help on Interference > From: "Jim B." <[EMAIL PROTECTED]> > 3. Re: Re: IFR Monitor Repair Charges > From: "Steve Grantham" <[EMAIL PROTECTED]> > 4. Apcor? > From: "acbross" <[EMAIL PROTECTED]> > 5. Convertacom > From: "acbross" <[EMAIL PROTECTED]> > 6. RE: Apcor? > From: "Steve Bosshard" <[EMAIL PROTECTED]> > 7. Re: Help on Interference > From: Mathew Quaife <[EMAIL PROTECTED]> > 8. Re: Help on Interference > From: Virden Clark Beckman <[EMAIL PROTECTED]> > 9. Re: Apcor > From: [EMAIL PROTECTED] > 10. RE: Apcor > From: "Kevin Bednar" <[EMAIL PROTECTED]> > 11. Duplexer Alignment > From: "w9mwq" <[EMAIL PROTECTED]> > 12. Re: Apcor > From: "Jim B." <[EMAIL PROTECTED]> > 13. Re: Help on Interference > From: Mathew Quaife <[EMAIL PROTECTED]> > 14. Re: Duplexer Alignment > From: Ken Arck <[EMAIL PROTECTED]> > 15. Re: Help on Interference > From: "Jim B." <[EMAIL PROTECTED]> > 16. RE: Help on Interference > From: "Rogers, Ron" <[EMAIL PROTECTED]> > 17. Re: Duplexer Alignment > From: Mathew Quaife <[EMAIL PROTECTED]> > 18. Re: Help on Interference > From: Mathew Quaife <[EMAIL PROTECTED]> > 19. Re: Help on Interference > From: Virden Clark Beckman <[EMAIL PROTECTED]> > 20. Re: Duplexer Alignment > From: Ken Arck <[EMAIL PROTECTED]> > 21. Re: Help on Interference > From: Mathew Quaife <[EMAIL PROTECTED]> > 22. RE: Duplexer Alignment > From: "Gregg Lengling" <[EMAIL PROTECTED]> > 23. Re: Duplexer Alignment > From: Mathew Quaife <[EMAIL PROTECTED]> > 24. Re: Help on Interference > From: "Jim B." <[EMAIL PROTECTED]> > 25. RE: Help on Interference > From: "Steve Bosshard" <[EMAIL PROTECTED]> > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 1 > Date: Tue, 27 Apr 2004 15:57:04 -0000 > From: "kk2ed" <[EMAIL PROTECTED]> > Subject: Re: IFR Monitor Repair Charges > > --- In [email protected], "Steve S. Bosshard \(NU5D\)" > <[EMAIL PROTECTED]> wrote: > > Same deal with large LMR factory depot - flat rate for one problem - > more > > problems MORE $$$s. > > > > Steve > > I just repaired my COM120B - the 10MHz ref osc died. I called them > and almost fell out of the chair when I heard those numbers. And > over $350 for a service manual! > > I decided to calm down and dove into it to try and repair it myself. > I found that the 10MHz ref osc assembly was not putting out a signal. > I tested the rest of the monitor by injecting an external 10MHz > reference. I then pulled the osc module out and opened it up. I found > a shorted surface mount 10uF electrolytic cap, and a burned up > surface mount inductor (due the current draw of the shorted cap). > > I then called IFR (Aeroflex) to order the cap and inductor. Well, I > was told of a $50 min. order, and the two surface mount 10 cent parts > were $3 or so each. I was so turned off by them that I just told > them "send me $50 of whatever you need to, as long as I get the cap > and inductor I need". $60 later I had the cap and inductor, and > repaired the monitor. > > I guess I can't cry too much - $60 is a hell of a lot better than > $1200 flat rate! > > Moral of the story - fix it yourself if possible!!!! > > > Eric > KE2D > > > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 2 > Date: Tue, 27 Apr 2004 13:05:52 -0400 > From: "Jim B." <[EMAIL PROTECTED]> > Subject: Re: Help on Interference > > w9mwq wrote: > > I have a repeater with an antenna up about 60 feet in the air, > > Frequency of 146.925/146.325 minus offset. Receiever sensitity > > is .25 micorovolt at 12DB, seems to be purring along just fine. IFR > > show the receive to be on frequency. Here's the problem, there is a > > repeater about 50 air miles away, on the pair of 146.910/146.31o > > minus offset. There repeater is getting into my receiver, causing > > the repeater to key up. There is no pl on my repeater at this > > time. They sound like they are on sideband when they come in. I > > can goto the 91 machine, hear them talking, when they quit, the > > interference quits. I took my IFR and inserted a tone on 146.310 > > into my receiver, it took 15 microvolts to open the squelch of my > > receiver. Is it my receiver, which is a Regency receiver, or is it > > the person transmitting on the other machine. I could see if it was > > the 91 machine if all it was doing was killing my receive, but it's > > actually keying up the repeater. SO my guess would be it would have > > to be the person talking on the 91 repeater. I hope I explained > > this right. Any suggestions. Thanks. > > > > Mathew > > > > As others have said, the problem is users of the other system getting > into your receiver. You should notice that the problem goes away as soon > as the user unkeys. > Yes, the Regency receiver is a big problem. They are notorious for being > broad as a barn. A UHF repeater here used to be a Regency. I could bring > it up reliably from 30-35 miles away 10 Khz either side of frequency > with a 1W handheld! Find yourself a Micor or Mastr II receiver and that > should cut it down considerably. You'll never get rid of it altogether, > but you should be able to cut it down to where it's rare. > Our rptr on 146.625 has a 146.61 and a 146.64 rptr abt 50 miles away or > so. Our system is all Micor. Unless someone is right underneath one of > our receivers running a base station-type setup, we never hear anything > from them. Now the Michigan rptr 5 Khz away... > > -- > Jim Barbour > WD8CHL > > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 3 > Date: Tue, 27 Apr 2004 12:40:45 -0500 > From: "Steve Grantham" <[EMAIL PROTECTED]> > Subject: Re: Re: IFR Monitor Repair Charges > > Yeah.. I'd have been upset too! Upset enough to have been blinded by the > fiery rage! > > Always try to remember to order some knobs, spare pico fuses, or whatever > else might be cracked or broken if it will get you closer to the minimum > charge. > > 73, > Steve, AA5SG > > ----- Original Message ----- > From: "kk2ed" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Tuesday, April 27, 2004 10:57 AM > Subject: [Repeater-Builder] Re: IFR Monitor Repair Charges > > > > --- In [email protected], "Steve S. Bosshard \(NU5D\)" > > <[EMAIL PROTECTED]> wrote: > > > Same deal with large LMR factory depot - flat rate for one problem - > > more > > > problems MORE $$$s. > > > > > > Steve > > > > I just repaired my COM120B - the 10MHz ref osc died. I called them > > and almost fell out of the chair when I heard those numbers. And > > over $350 for a service manual! > > > > I decided to calm down and dove into it to try and repair it myself. > > I found that the 10MHz ref osc assembly was not putting out a signal. > > I tested the rest of the monitor by injecting an external 10MHz > > reference. I then pulled the osc module out and opened it up. I found > > a shorted surface mount 10uF electrolytic cap, and a burned up > > surface mount inductor (due the current draw of the shorted cap). > > > > I then called IFR (Aeroflex) to order the cap and inductor. Well, I > > was told of a $50 min. order, and the two surface mount 10 cent parts > > were $3 or so each. I was so turned off by them that I just told > > them "send me $50 of whatever you need to, as long as I get the cap > > and inductor I need". $60 later I had the cap and inductor, and > > repaired the monitor. > > > > I guess I can't cry too much - $60 is a hell of a lot better than > > $1200 flat rate! > > > > Moral of the story - fix it yourself if possible!!!! > > > > > > Eric > > KE2D > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 4 > Date: Tue, 27 Apr 2004 17:47:52 -0000 > From: "acbross" <[EMAIL PROTECTED]> > Subject: Apcor? > > Anyone ever heard of a Motorola Apcor radio? A friend has described > it as a packset with 10 channels UHF. Can anyone tell me more about > it? > > Art - KC7GF > > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 5 > Date: Tue, 27 Apr 2004 17:50:47 -0000 > From: "acbross" <[EMAIL PROTECTED]> > Subject: Convertacom > > Anyone have the pinout of the 25 pin connector on the bottom of a > convertacom (NTN5612A)? > > Art - KC7GF > > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 6 > Date: Tue, 27 Apr 2004 13:00:10 -0500 > From: "Steve Bosshard" <[EMAIL PROTECTED]> > Subject: RE: Apcor? > > Back in the olden days when Adam 12 and Emergency were on TV, the guys > would call Rampart and send a strip back to the ER using a Coronary > Observation Radio. The Apcor would use the truck as a vehicular > repeater back to the ER. The truck was equipped with a full duplex > radio using MED 1 thru MED 10 with MED 9 and 10 reserved for dispatch, > and 1 thru 8 for working channels. Med 1 Base was 463.000 and went in > 25kc steps except MED 9 and 10, 462.950 and 462.975 respectively. > > The truck listened on several 458 Mhz. channels and retran on standard > med channels. > > The Apcor worked in tandem with the truck and usually not solo, although > some areas it could. > > Best I recall the 2 headed duplex monster in the truck ran about $21,000 > plus the cost of the apcor. > > Books are probably long gone, > > Steve > > > > > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 7 > Date: Tue, 27 Apr 2004 13:10:29 -0500 > From: Mathew Quaife <[EMAIL PROTECTED]> > Subject: Re: Help on Interference > > Yes you are right, I found the user that was causing the interference, not > much I can do about it. I am waiting on a new receiver, so hopefully that > will help cure some of the problems. Thanks for the input. > > Mathew > > ----- Original Message ----- > From: "Jim B." <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Tuesday, April 27, 2004 12:05 PM > Subject: Re: [Repeater-Builder] Help on Interference > > > > w9mwq wrote: > > > I have a repeater with an antenna up about 60 feet in the air, > > > Frequency of 146.925/146.325 minus offset. Receiever sensitity > > > is .25 micorovolt at 12DB, seems to be purring along just fine. IFR > > > show the receive to be on frequency. Here's the problem, there is a > > > repeater about 50 air miles away, on the pair of 146.910/146.31o > > > minus offset. There repeater is getting into my receiver, causing > > > the repeater to key up. There is no pl on my repeater at this > > > time. They sound like they are on sideband when they come in. I > > > can goto the 91 machine, hear them talking, when they quit, the > > > interference quits. I took my IFR and inserted a tone on 146.310 > > > into my receiver, it took 15 microvolts to open the squelch of my > > > receiver. Is it my receiver, which is a Regency receiver, or is it > > > the person transmitting on the other machine. I could see if it was > > > the 91 machine if all it was doing was killing my receive, but it's > > > actually keying up the repeater. SO my guess would be it would have > > > to be the person talking on the 91 repeater. I hope I explained > > > this right. Any suggestions. Thanks. > > > > > > Mathew > > > > > > > As others have said, the problem is users of the other system getting > > into your receiver. You should notice that the problem goes away as soon > > as the user unkeys. > > Yes, the Regency receiver is a big problem. They are notorious for being > > broad as a barn. A UHF repeater here used to be a Regency. I could bring > > it up reliably from 30-35 miles away 10 Khz either side of frequency > > with a 1W handheld! Find yourself a Micor or Mastr II receiver and that > > should cut it down considerably. You'll never get rid of it altogether, > > but you should be able to cut it down to where it's rare. > > Our rptr on 146.625 has a 146.61 and a 146.64 rptr abt 50 miles away or > > so. Our system is all Micor. Unless someone is right underneath one of > > our receivers running a base station-type setup, we never hear anything > > from them. Now the Michigan rptr 5 Khz away... > > > > -- > > Jim Barbour > > WD8CHL > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 8 > Date: Tue, 27 Apr 2004 15:26:35 -0400 > From: Virden Clark Beckman <[EMAIL PROTECTED]> > Subject: Re: Help on Interference > > Try using the math on the IF of your rx to see what is making them mix > on your freq, how long have the 2 machines been co-existing on-the-air? > If it were one or 2 users you would know it rather than the entire time > the machine is active, can you see how clean the signal is from that > machine, I doubt if 50 miles is gonna make trouble unless the have some > really wide spurs and then every open rx is gonna see some falsing. > > w9mwq wrote: > > > > I have a repeater with an antenna up about 60 feet in the air, > > Frequency of 146.925/146.325 minus offset. Receiever sensitity > > is .25 micorovolt at 12DB, seems to be purring along just fine. IFR > > show the receive to be on frequency. Here's the problem, there is a > > repeater about 50 air miles away, on the pair of 146.910/146.31o > > minus offset. There repeater is getting into my receiver, causing > > the repeater to key up. There is no pl on my repeater at this > > time. They sound like they are on sideband when they come in. I > > can goto the 91 machine, hear them talking, when they quit, the > > interference quits. I took my IFR and inserted a tone on 146.310 > > into my receiver, it took 15 microvolts to open the squelch of my > > receiver. Is it my receiver, which is a Regency receiver, or is it > > the person transmitting on the other machine. I could see if it was > > the 91 machine if all it was doing was killing my receive, but it's > > actually keying up the repeater. SO my guess would be it would have > > to be the person talking on the 91 repeater. I hope I explained > > this right. Any suggestions. Thanks. > > > > Mathew > > -- > 73...Clark Beckman N8PZD > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 9 > Date: Tue, 27 Apr 2004 15:28:51 -0400 > From: [EMAIL PROTECTED] > Subject: Re: Apcor > > > Additional to Steve's -- > > "Squad 51" had the huge orange cargo-case... > 80's era APCOR were more like a "double-sized lunch-box" - about 1/3 > battery; believe the RF decks were built around the MX series.. > > > On Tue, 27 Apr 2004 13:00:10 -0500 "Steve Bosshard" <[EMAIL PROTECTED]> > writes: > > Back in the olden days when Adam 12 and Emergency were on TV, the guys > would call Rampart ... > > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 10 > Date: Tue, 27 Apr 2004 15:35:56 -0400 > From: "Kevin Bednar" <[EMAIL PROTECTED]> > Subject: RE: Apcor > > The box on Emergency! was actually a GE telemetry radio I believe. The APCOR > consisted of 2 parts. The APCOR itself was MX based and ran relatively low > power, I think around 2 watts. The mobile unit was Micor based and they were > strange beasts. The Micor/APCOR system was an in-band UHF repeater system. > The Micor would TX and rcv on the med channels 1-10 on 460.xxx and > rebroadcast out to the APCOR on 450.xxx. A neat system for its time. > > Kevin > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > Sent: Tuesday, April 27, 2004 3:29 PM > To: [email protected] > Subject: Re: [Repeater-Builder] Apcor > > > Additional to Steve's -- > > "Squad 51" had the huge orange cargo-case... > 80's era APCOR were more like a "double-sized lunch-box" - about 1/3 > battery; believe the RF decks were built around the MX series.. > > > On Tue, 27 Apr 2004 13:00:10 -0500 "Steve Bosshard" <[EMAIL PROTECTED]> > writes: > > Back in the olden days when Adam 12 and Emergency were on TV, the guys > would call Rampart ... > > > > > > > Yahoo! Groups Links > > > > > > > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 11 > Date: Tue, 27 Apr 2004 19:40:26 -0000 > From: "w9mwq" <[EMAIL PROTECTED]> > Subject: Duplexer Alignment > > Is there any methods of tuning a set of duplexer without having a > Spectrum analyzer. I am in the learning stages again. I have an > IFR-500a, so I can generate a signal into them. I know this would > work somewhat for the receive, but what does one do for the > transmit. > > Mathew > > > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 12 > Date: Tue, 27 Apr 2004 15:42:55 -0400 > From: "Jim B." <[EMAIL PROTECTED]> > Subject: Re: Apcor > > [EMAIL PROTECTED] wrote: > > > Additional to Steve's -- > > > > "Squad 51" had the huge orange cargo-case... > > Yeah-they were called 'Biocoms'. Basic RF components were those > Repco/Comco/whatever modular handhelds. Pretty junky by todays standards. > > > 80's era APCOR were more like a "double-sized lunch-box" - about 1/3 > > battery; believe the RF decks were built around the MX series.. > > > > Yup. Not much better than the Biocoms... > > -- > Jim Barbour > WD8CHL > > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 13 > Date: Tue, 27 Apr 2004 14:46:12 -0500 > From: Mathew Quaife <[EMAIL PROTECTED]> > Subject: Re: Help on Interference > > Well I narrowed down parts of the problem, the first being the wide as a 2x4 > Regency receiver, which is going to be changed out, and the other is a local > ham using 100 watts to talk to this machine, when in it really only needs > about 7 watts to hit it full quieting with minimal antenna height. My > repeater actually is just gettting underway, new coordination. So each day > is a new adventure for me. Having not played with FM and etc....for about > 15 years, still trying to remember, kinda hard to get all the cobwebs out of > the brain. Thanks. > > Mathew > > ----- Original Message ----- > From: "Virden Clark Beckman" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Tuesday, April 27, 2004 2:26 PM > Subject: Re: [Repeater-Builder] Help on Interference > > > > Try using the math on the IF of your rx to see what is making them mix > > on your freq, how long have the 2 machines been co-existing on-the-air? > > If it were one or 2 users you would know it rather than the entire time > > the machine is active, can you see how clean the signal is from that > > machine, I doubt if 50 miles is gonna make trouble unless the have some > > really wide spurs and then every open rx is gonna see some falsing. > > > > w9mwq wrote: > > > > > > I have a repeater with an antenna up about 60 feet in the air, > > > Frequency of 146.925/146.325 minus offset. Receiever sensitity > > > is .25 micorovolt at 12DB, seems to be purring along just fine. IFR > > > show the receive to be on frequency. Here's the problem, there is a > > > repeater about 50 air miles away, on the pair of 146.910/146.31o > > > minus offset. There repeater is getting into my receiver, causing > > > the repeater to key up. There is no pl on my repeater at this > > > time. They sound like they are on sideband when they come in. I > > > can goto the 91 machine, hear them talking, when they quit, the > > > interference quits. I took my IFR and inserted a tone on 146.310 > > > into my receiver, it took 15 microvolts to open the squelch of my > > > receiver. Is it my receiver, which is a Regency receiver, or is it > > > the person transmitting on the other machine. I could see if it was > > > the 91 machine if all it was doing was killing my receive, but it's > > > actually keying up the repeater. SO my guess would be it would have > > > to be the person talking on the 91 repeater. I hope I explained > > > this right. Any suggestions. Thanks. > > > > > > Mathew > > > > -- > > 73...Clark Beckman N8PZD > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 14 > Date: Tue, 27 Apr 2004 12:49:30 -0700 > From: Ken Arck <[EMAIL PROTECTED]> > Subject: Re: Duplexer Alignment > > At 07:40 PM 4/27/2004 -0000, you wrote: > >Is there any methods of tuning a set of duplexer without having a > >Spectrum analyzer. I am in the learning stages again. I have an > >IFR-500a, so I can generate a signal into them. I know this would > >work somewhat for the receive, but what does one do for the > >transmit. > > <---Why wouldn't it work for transmit? As a matter of fact, it would work > just fine by both the receive AND transmit sides of the duplexer. RF is RF, > regardless if its -100 Dbm or +10 Dbm, right? > > Depending on what kind of duplexer is it (BP/BR or just BR) determines the > tuning procedure. You might want to check the website to see if yours is > listed. One thing though - It's a good idea to use a 3 db pad on the > receiver you're using for tuning, since you have no guarantee it will > present a 50 ohm load to the duplexer. > > Oh, and don't forget to make sure a 50 ohm load is on the duplexer port > not currently being tuned as well (a 3 db pad would work here as well). > > Ken > -------------------------------------------------------------------------- ---- > President and CTO - Arcom Communications > Makers of state-of-the-art repeater controllers and accessories. > http://www.ah6le.net/arcom/index.html > Be sure to see our products at this year's Dayton Hamvention! > Repeater Builders spaces 707 through 710 > AH6LE/R - IRLP Node 3000 > http://www.irlp.net > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 15 > Date: Tue, 27 Apr 2004 15:54:38 -0400 > From: "Jim B." <[EMAIL PROTECTED]> > Subject: Re: Help on Interference > > Mathew Quaife wrote: > > > Well I narrowed down parts of the problem, the first being the wide as a 2x4 > > Regency receiver, which is going to be changed out, > > yeah. guess ya gotta start somewhere...;c) > > > and the other is a local > > ham using 100 watts to talk to this machine, when in it really only needs > > about 7 watts to hit it full quieting with minimal antenna height. > > As long as your repeater is coordinated, that's malicious interference. > He needs to stop. > > > My repeater actually is just gettting underway, new coordination. So each day > > is a new adventure for me. Having not played with FM and etc....for about > > 15 years, still trying to remember, kinda hard to get all the cobwebs out of > > the brain. Thanks. > > > > Mathew > > > > heh-roger that... > -- > Jim Barbour > WD8CHL > > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 16 > Date: Tue, 27 Apr 2004 15:53:47 -0400 > From: "Rogers, Ron" <[EMAIL PROTECTED]> > Subject: RE: Help on Interference > > Remind the fellow using 100 watts to talk to a repeater that he could be in > violation of Part 97 rules on using minimal power. > We had a similar situation and interference to our one 2 meter repeater on > the mountain and we had to remind the guy of the "Laws of Radio Physics", > power, distance, and Part 97 !! > > Ron > WW8RR > > -----Original Message----- > From: Mathew Quaife [mailto:[EMAIL PROTECTED] > Sent: Tuesday, April 27, 2004 3:46 PM > To: [email protected] > Subject: Re: [Repeater-Builder] Help on Interference > > > Well I narrowed down parts of the problem, the first being the wide as a 2x4 > Regency receiver, which is going to be changed out, and the other is a local > ham using 100 watts to talk to this machine, when in it really only needs > about 7 watts to hit it full quieting with minimal antenna height. My > repeater actually is just gettting underway, new coordination. So each day > is a new adventure for me. Having not played with FM and etc....for about > 15 years, still trying to remember, kinda hard to get all the cobwebs out of > the brain. Thanks. > > Mathew > > ----- Original Message ----- > From: "Virden Clark Beckman" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Tuesday, April 27, 2004 2:26 PM > Subject: Re: [Repeater-Builder] Help on Interference > > > > Try using the math on the IF of your rx to see what is making them mix > > on your freq, how long have the 2 machines been co-existing on-the-air? > > If it were one or 2 users you would know it rather than the entire time > > the machine is active, can you see how clean the signal is from that > > machine, I doubt if 50 miles is gonna make trouble unless the have some > > really wide spurs and then every open rx is gonna see some falsing. > > > > w9mwq wrote: > > > > > > I have a repeater with an antenna up about 60 feet in the air, > > > Frequency of 146.925/146.325 minus offset. Receiever sensitity > > > is .25 micorovolt at 12DB, seems to be purring along just fine. IFR > > > show the receive to be on frequency. Here's the problem, there is a > > > repeater about 50 air miles away, on the pair of 146.910/146.31o > > > minus offset. There repeater is getting into my receiver, causing > > > the repeater to key up. There is no pl on my repeater at this > > > time. They sound like they are on sideband when they come in. I > > > can goto the 91 machine, hear them talking, when they quit, the > > > interference quits. I took my IFR and inserted a tone on 146.310 > > > into my receiver, it took 15 microvolts to open the squelch of my > > > receiver. Is it my receiver, which is a Regency receiver, or is it > > > the person transmitting on the other machine. I could see if it was > > > the 91 machine if all it was doing was killing my receive, but it's > > > actually keying up the repeater. SO my guess would be it would have > > > to be the person talking on the 91 repeater. I hope I explained > > > this right. Any suggestions. Thanks. > > > > > > Mathew > > > > -- > > 73...Clark Beckman N8PZD > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 17 > Date: Tue, 27 Apr 2004 14:54:29 -0500 > From: Mathew Quaife <[EMAIL PROTECTED]> > Subject: Re: Duplexer Alignment > > The duplexers are a set of TX/RX duplexers, six of them. When you say a 3db > pad, that is something that I am not sure of, is this basically the same > thing as a db pad used in CATV systems? All I know is that the duplexers > were set up as a Varinotch filter system. > > Mathew > > ----- Original Message ----- > From: "Ken Arck" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Tuesday, April 27, 2004 2:49 PM > Subject: Re: [Repeater-Builder] Duplexer Alignment > > > > At 07:40 PM 4/27/2004 -0000, you wrote: > > >Is there any methods of tuning a set of duplexer without having a > > >Spectrum analyzer. I am in the learning stages again. I have an > > >IFR-500a, so I can generate a signal into them. I know this would > > >work somewhat for the receive, but what does one do for the > > >transmit. > > > > <---Why wouldn't it work for transmit? As a matter of fact, it would work > > just fine by both the receive AND transmit sides of the duplexer. RF is > RF, > > regardless if its -100 Dbm or +10 Dbm, right? > > > > Depending on what kind of duplexer is it (BP/BR or just BR) determines the > > tuning procedure. You might want to check the website to see if yours is > > listed. One thing though - It's a good idea to use a 3 db pad on the > > receiver you're using for tuning, since you have no guarantee it will > > present a 50 ohm load to the duplexer. > > > > Oh, and don't forget to make sure a 50 ohm load is on the duplexer port > > not currently being tuned as well (a 3 db pad would work here as well). > > > > Ken > > -------------------------------------------------------------------------- > ---- > > President and CTO - Arcom Communications > > Makers of state-of-the-art repeater controllers and accessories. > > http://www.ah6le.net/arcom/index.html > > Be sure to see our products at this year's Dayton Hamvention! > > Repeater Builders spaces 707 through 710 > > AH6LE/R - IRLP Node 3000 > > http://www.irlp.net > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 18 > Date: Tue, 27 Apr 2004 14:56:58 -0500 > From: Mathew Quaife <[EMAIL PROTECTED]> > Subject: Re: Help on Interference > > I could not agree with you more, however, I would tend to think I would have > better luck talking to my 4 yr old and getting him to listen. Somehow, Part > 97 never enters his mind. I'm changing the receiver to a GE Century > receiver, so that should help narrow things down somewhat I hope. > > ----- Original Message ----- > From: "Rogers, Ron" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Tuesday, April 27, 2004 2:53 PM > Subject: RE: [Repeater-Builder] Help on Interference > > > > Remind the fellow using 100 watts to talk to a repeater that he could be > in > > violation of Part 97 rules on using minimal power. > > We had a similar situation and interference to our one 2 meter repeater on > > the mountain and we had to remind the guy of the "Laws of Radio Physics", > > power, distance, and Part 97 !! > > > > Ron > > WW8RR > > > > -----Original Message----- > > From: Mathew Quaife [mailto:[EMAIL PROTECTED] > > Sent: Tuesday, April 27, 2004 3:46 PM > > To: [email protected] > > Subject: Re: [Repeater-Builder] Help on Interference > > > > > > Well I narrowed down parts of the problem, the first being the wide as a > 2x4 > > Regency receiver, which is going to be changed out, and the other is a > local > > ham using 100 watts to talk to this machine, when in it really only needs > > about 7 watts to hit it full quieting with minimal antenna height. My > > repeater actually is just gettting underway, new coordination. So each > day > > is a new adventure for me. Having not played with FM and etc....for about > > 15 years, still trying to remember, kinda hard to get all the cobwebs out > of > > the brain. Thanks. > > > > Mathew > > > > ----- Original Message ----- > > From: "Virden Clark Beckman" <[EMAIL PROTECTED]> > > To: <[email protected]> > > Sent: Tuesday, April 27, 2004 2:26 PM > > Subject: Re: [Repeater-Builder] Help on Interference > > > > > > > Try using the math on the IF of your rx to see what is making them mix > > > on your freq, how long have the 2 machines been co-existing on-the-air? > > > If it were one or 2 users you would know it rather than the entire time > > > the machine is active, can you see how clean the signal is from that > > > machine, I doubt if 50 miles is gonna make trouble unless the have some > > > really wide spurs and then every open rx is gonna see some falsing. > > > > > > w9mwq wrote: > > > > > > > > I have a repeater with an antenna up about 60 feet in the air, > > > > Frequency of 146.925/146.325 minus offset. Receiever sensitity > > > > is .25 micorovolt at 12DB, seems to be purring along just fine. IFR > > > > show the receive to be on frequency. Here's the problem, there is a > > > > repeater about 50 air miles away, on the pair of 146.910/146.31o > > > > minus offset. There repeater is getting into my receiver, causing > > > > the repeater to key up. There is no pl on my repeater at this > > > > time. They sound like they are on sideband when they come in. I > > > > can goto the 91 machine, hear them talking, when they quit, the > > > > interference quits. I took my IFR and inserted a tone on 146.310 > > > > into my receiver, it took 15 microvolts to open the squelch of my > > > > receiver. Is it my receiver, which is a Regency receiver, or is it > > > > the person transmitting on the other machine. I could see if it was > > > > the 91 machine if all it was doing was killing my receive, but it's > > > > actually keying up the repeater. SO my guess would be it would have > > > > to be the person talking on the 91 repeater. I hope I explained > > > > this right. Any suggestions. Thanks. > > > > > > > > Mathew > > > > > > -- > > > 73...Clark Beckman N8PZD > > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 19 > Date: Tue, 27 Apr 2004 16:02:34 -0400 > From: Virden Clark Beckman <[EMAIL PROTECTED]> > Subject: Re: Help on Interference > > Rather than re-invent the wheel why not try carving the helical from a > dead old high band rx tray and add to the front of yours to make it a > bit narrower than it is barefoot, if you can find a mastr2 with 5 > helicals you could ad a pre-amp and convert the near hits to misses. > > Mathew Quaife wrote: > > > > Well I narrowed down parts of the problem, the first being the wide as a 2x4 > > Regency receiver, which is going to be changed out, and the other is a local > > ham using 100 watts to talk to this machine, when in it really only needs > > about 7 watts to hit it full quieting with minimal antenna height. My > > repeater actually is just gettting underway, new coordination. So each day > > is a new adventure for me. Having not played with FM and etc....for about > > 15 years, still trying to remember, kinda hard to get all the cobwebs out of > > the brain. Thanks. > > > > Mathew > > > > ----- Original Message ----- > > From: "Virden Clark Beckman" <[EMAIL PROTECTED]> > > To: <[email protected]> > > Sent: Tuesday, April 27, 2004 2:26 PM > > Subject: Re: [Repeater-Builder] Help on Interference > > > > > Try using the math on the IF of your rx to see what is making them mix > > > on your freq, how long have the 2 machines been co-existing on-the-air? > > > If it were one or 2 users you would know it rather than the entire time > > > the machine is active, can you see how clean the signal is from that > > > machine, I doubt if 50 miles is gonna make trouble unless the have some > > > really wide spurs and then every open rx is gonna see some falsing. > > -- > 73...Clark Beckman N8PZD > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 20 > Date: Tue, 27 Apr 2004 13:06:19 -0700 > From: Ken Arck <[EMAIL PROTECTED]> > Subject: Re: Duplexer Alignment > > > At 02:54 PM 4/27/2004 -0500, you wrote: > >The duplexers are a set of TX/RX duplexers, six of them. When you say a 3db > >pad, that is something that I am not sure of, is this basically the same > >thing as a db pad used in CATV systems? > > <---Yes they are the same CONCEPT, but CATV ones would be 72 (75?) ohm. > You, of course, need 50 ohm ones. The idea behind using them is to present > an accurate 50 ohm load on the duplexer ports, because a change of load > affects the tuning. If you don't have any, I'd suggest begging or borrowing > some from a buddy :-) > > > All I know is that the duplexers were set up as a Varinotch filter system. > > <---If I'm not mistaken, that's a notch type duplexer. Aside from visiting > TX/RX's website (to see if you can locate tuning instructions), you might > want to check out this link as well: > > http://www.repeater-builder.com/rbtip/notchduptuning.html > > Ken > -------------------------------------------------------------------------- ---- > President and CTO - Arcom Communications > Makers of state-of-the-art repeater controllers and accessories. > http://www.ah6le.net/arcom/index.html > Be sure to see our products at this year's Dayton Hamvention! > Repeater Builders spaces 707 through 710 > AH6LE/R - IRLP Node 3000 > http://www.irlp.net > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 21 > Date: Tue, 27 Apr 2004 15:12:51 -0500 > From: Mathew Quaife <[EMAIL PROTECTED]> > Subject: Re: Help on Interference > > Objective to changing the reciever is to sperate it from the transmitter, > when I first started this project, the regency repeaters were at hand, but > as I play with more and more, find that they need a little help. I'm just > waiting on the new receivers to get here. I'm sure the GE century has got > to be somewhat better than the Regency. A preamp would be nice, but > hopefully I can get by without it. Plans are to later on put in two voters > to cover a few parts of the county that will be troublesome. > > Mathew > > ----- Original Message ----- > From: "Virden Clark Beckman" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Tuesday, April 27, 2004 3:02 PM > Subject: Re: [Repeater-Builder] Help on Interference > > > > Rather than re-invent the wheel why not try carving the helical from a > > dead old high band rx tray and add to the front of yours to make it a > > bit narrower than it is barefoot, if you can find a mastr2 with 5 > > helicals you could ad a pre-amp and convert the near hits to misses. > > > > Mathew Quaife wrote: > > > > > > Well I narrowed down parts of the problem, the first being the wide as a > 2x4 > > > Regency receiver, which is going to be changed out, and the other is a > local > > > ham using 100 watts to talk to this machine, when in it really only > needs > > > about 7 watts to hit it full quieting with minimal antenna height. My > > > repeater actually is just gettting underway, new coordination. So each > day > > > is a new adventure for me. Having not played with FM and etc....for > about > > > 15 years, still trying to remember, kinda hard to get all the cobwebs > out of > > > the brain. Thanks. > > > > > > Mathew > > > > > > ----- Original Message ----- > > > From: "Virden Clark Beckman" <[EMAIL PROTECTED]> > > > To: <[email protected]> > > > Sent: Tuesday, April 27, 2004 2:26 PM > > > Subject: Re: [Repeater-Builder] Help on Interference > > > > > > > Try using the math on the IF of your rx to see what is making them mix > > > > on your freq, how long have the 2 machines been co-existing > on-the-air? > > > > If it were one or 2 users you would know it rather than the entire > time > > > > the machine is active, can you see how clean the signal is from that > > > > machine, I doubt if 50 miles is gonna make trouble unless the have > some > > > > really wide spurs and then every open rx is gonna see some falsing. > > > > -- > > 73...Clark Beckman N8PZD > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 22 > Date: Tue, 27 Apr 2004 15:14:22 -0500 > From: "Gregg Lengling" <[EMAIL PROTECTED]> > Subject: RE: Duplexer Alignment > > You should really be using a return loss bridge and a spectrum analyzer and > tracking generator....but yes I know we can't all afford that equipment. > You can fudge by using a signal generator and a receiver, also never never > never tune the duplexers under transmitter power. > > The first thing you need as previously stated is a 3dB pad on the input to > your receiver you are going to use as signal strength indicator. You will > also need a 50 ohm termination for the unused port of the duplexer during > tuning. The pad is similar to those used in cable tv > systems...HOWEVER..those pads are 75ohms and you have a 50 ohm system. > > Step one, Hook your generator to the antenna port and your receiver (with > 3dB pad) to either the transmit or receiver port. Terminate the other port > (ie: if you are tuning the transmit port, terminate the receiver port). > > Before you start on the duplexor..hook your signal generator up to your > receiver with the 3db pad in line and measure the receiver sensitivity of > you receiver (ie: .022uV for 12dB Sinad)....this is your reference. > > In this case we'll say your on the transmit port. The first thing to do is > to tune the pass frequency..this is the plunger on each cavity in the > transmitter side of the duplexer. Generate just enough signal to start > movement of your receiver strength indicator using your transmit frequency. > Now tune all the TX cans one at a time for max throughput...max signal > strength...you will probably have to continually reduce your output from the > generator as you get the unit tuned. Now look at the output level from the > generator....how many dB of insertion loss do you have compared to your > receiver performance with the cavities in line. (Assume anywhere from .6 to > 1.0 dB per cavity loss)...is this the expected value...if yes the pass is > tuned..if not something is wrong. Next you will tune the notches.....with > everything still connected, now set the generator and receiver to your Notch > Frequency (the receiver freq in this case). You can now tune the notches > (usually in the little box on top of the coupling loop with a small access > hole on the side...use an insulated non-metallic tool). Tune these to > attenuate the signal reaching the receiver, one at a time. Now measure the > difference between the generator output and the receiver known sensitivity. > You should have anywhere between 85 and 100 dB of attenuation. In other > words you'll have a huge amount of signal being generated by your signal > generator. > > Now you're done with the transmit side. Now using the same set of > instructions but with the frequencies reversed....do the same to the receive > side. > > When both sides are done...go back and check all your measurements again and > make sure you didn't screw up. > > Yes this will not be perfect using this procedure, but I've found you can be > within a couple of dB of rejection specs, or as they say good enough for > government work until you can beg/borrow/or steal the proper test equipment. > > Good luck. > > > Gregg R. Lengling, W9DHI, Retired > Administrator http://www.milwaukeehdtv.org > K2/100 S#3075 KX1 S# 57 > Politics is the art of appearing candid and completely open, while > concealing as much as possible. -States: The Bene Gesserit View > > > > -----Original Message----- > From: Mathew Quaife [mailto:[EMAIL PROTECTED] > Sent: Tuesday, April 27, 2004 2:54 PM > To: [email protected] > Subject: Re: [Repeater-Builder] Duplexer Alignment > > The duplexers are a set of TX/RX duplexers, six of them. When you say a 3db > pad, that is something that I am not sure of, is this basically the same > thing as a db pad used in CATV systems? All I know is that the duplexers > were set up as a Varinotch filter system. > > Mathew > > ----- Original Message ----- > From: "Ken Arck" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Tuesday, April 27, 2004 2:49 PM > Subject: Re: [Repeater-Builder] Duplexer Alignment > > > > At 07:40 PM 4/27/2004 -0000, you wrote: > > >Is there any methods of tuning a set of duplexer without having a > > >Spectrum analyzer. I am in the learning stages again. I have an > > >IFR-500a, so I can generate a signal into them. I know this would > > >work somewhat for the receive, but what does one do for the > > >transmit. > > > > <---Why wouldn't it work for transmit? As a matter of fact, it would work > > just fine by both the receive AND transmit sides of the duplexer. RF is > RF, > > regardless if its -100 Dbm or +10 Dbm, right? > > > > Depending on what kind of duplexer is it (BP/BR or just BR) determines the > > tuning procedure. You might want to check the website to see if yours is > > listed. One thing though - It's a good idea to use a 3 db pad on the > > receiver you're using for tuning, since you have no guarantee it will > > present a 50 ohm load to the duplexer. > > > > Oh, and don't forget to make sure a 50 ohm load is on the duplexer port > > not currently being tuned as well (a 3 db pad would work here as well). > > > > Ken > > -------------------------------------------------------------------------- > ---- > > President and CTO - Arcom Communications > > Makers of state-of-the-art repeater controllers and accessories. > > http://www.ah6le.net/arcom/index.html > > Be sure to see our products at this year's Dayton Hamvention! > > Repeater Builders spaces 707 through 710 > > AH6LE/R - IRLP Node 3000 > > http://www.irlp.net > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 23 > Date: Tue, 27 Apr 2004 15:26:17 -0500 > From: Mathew Quaife <[EMAIL PROTECTED]> > Subject: Re: Duplexer Alignment > > Ok, most of that I understand, and I know there is the main tuning rod, then > there is the reject high and reject low tuning pots, but there is a third > tuning rod on these duplexers, what would be thier function. > > Mathew > > ----- Original Message ----- > From: "Gregg Lengling" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Tuesday, April 27, 2004 3:14 PM > Subject: RE: [Repeater-Builder] Duplexer Alignment > > > > You should really be using a return loss bridge and a spectrum analyzer > and > > tracking generator....but yes I know we can't all afford that equipment. > > You can fudge by using a signal generator and a receiver, also never never > > never tune the duplexers under transmitter power. > > > > The first thing you need as previously stated is a 3dB pad on the input to > > your receiver you are going to use as signal strength indicator. You will > > also need a 50 ohm termination for the unused port of the duplexer during > > tuning. The pad is similar to those used in cable tv > > systems...HOWEVER..those pads are 75ohms and you have a 50 ohm system. > > > > Step one, Hook your generator to the antenna port and your receiver (with > > 3dB pad) to either the transmit or receiver port. Terminate the other > port > > (ie: if you are tuning the transmit port, terminate the receiver port). > > > > Before you start on the duplexor..hook your signal generator up to your > > receiver with the 3db pad in line and measure the receiver sensitivity of > > you receiver (ie: .022uV for 12dB Sinad)....this is your reference. > > > > In this case we'll say your on the transmit port. The first thing to do > is > > to tune the pass frequency..this is the plunger on each cavity in the > > transmitter side of the duplexer. Generate just enough signal to start > > movement of your receiver strength indicator using your transmit > frequency. > > Now tune all the TX cans one at a time for max throughput...max signal > > strength...you will probably have to continually reduce your output from > the > > generator as you get the unit tuned. Now look at the output level from > the > > generator....how many dB of insertion loss do you have compared to your > > receiver performance with the cavities in line. (Assume anywhere from .6 > to > > 1.0 dB per cavity loss)...is this the expected value...if yes the pass is > > tuned..if not something is wrong. Next you will tune the notches.....with > > everything still connected, now set the generator and receiver to your > Notch > > Frequency (the receiver freq in this case). You can now tune the notches > > (usually in the little box on top of the coupling loop with a small access > > hole on the side...use an insulated non-metallic tool). Tune these to > > attenuate the signal reaching the receiver, one at a time. Now measure > the > > difference between the generator output and the receiver known > sensitivity. > > You should have anywhere between 85 and 100 dB of attenuation. In other > > words you'll have a huge amount of signal being generated by your signal > > generator. > > > > Now you're done with the transmit side. Now using the same set of > > instructions but with the frequencies reversed....do the same to the > receive > > side. > > > > When both sides are done...go back and check all your measurements again > and > > make sure you didn't screw up. > > > > Yes this will not be perfect using this procedure, but I've found you can > be > > within a couple of dB of rejection specs, or as they say good enough for > > government work until you can beg/borrow/or steal the proper test > equipment. > > > > Good luck. > > > > > > Gregg R. Lengling, W9DHI, Retired > > Administrator http://www.milwaukeehdtv.org > > K2/100 S#3075 KX1 S# 57 > > Politics is the art of appearing candid and completely open, while > > concealing as much as possible. -States: The Bene Gesserit View > > > > > > > > -----Original Message----- > > From: Mathew Quaife [mailto:[EMAIL PROTECTED] > > Sent: Tuesday, April 27, 2004 2:54 PM > > To: [email protected] > > Subject: Re: [Repeater-Builder] Duplexer Alignment > > > > The duplexers are a set of TX/RX duplexers, six of them. When you say a > 3db > > pad, that is something that I am not sure of, is this basically the same > > thing as a db pad used in CATV systems? All I know is that the duplexers > > were set up as a Varinotch filter system. > > > > Mathew > > > > ----- Original Message ----- > > From: "Ken Arck" <[EMAIL PROTECTED]> > > To: <[email protected]> > > Sent: Tuesday, April 27, 2004 2:49 PM > > Subject: Re: [Repeater-Builder] Duplexer Alignment > > > > > > > At 07:40 PM 4/27/2004 -0000, you wrote: > > > >Is there any methods of tuning a set of duplexer without having a > > > >Spectrum analyzer. I am in the learning stages again. I have an > > > >IFR-500a, so I can generate a signal into them. I know this would > > > >work somewhat for the receive, but what does one do for the > > > >transmit. > > > > > > <---Why wouldn't it work for transmit? As a matter of fact, it would > work > > > just fine by both the receive AND transmit sides of the duplexer. RF is > > RF, > > > regardless if its -100 Dbm or +10 Dbm, right? > > > > > > Depending on what kind of duplexer is it (BP/BR or just BR) determines > the > > > tuning procedure. You might want to check the website to see if yours is > > > listed. One thing though - It's a good idea to use a 3 db pad on the > > > receiver you're using for tuning, since you have no guarantee it will > > > present a 50 ohm load to the duplexer. > > > > > > Oh, and don't forget to make sure a 50 ohm load is on the duplexer port > > > not currently being tuned as well (a 3 db pad would work here as well). > > > > > > Ken > > > > -------------------------------------------------------------------------- > > ---- > > > President and CTO - Arcom Communications > > > Makers of state-of-the-art repeater controllers and accessories. > > > http://www.ah6le.net/arcom/index.html > > > Be sure to see our products at this year's Dayton Hamvention! > > > Repeater Builders spaces 707 through 710 > > > AH6LE/R - IRLP Node 3000 > > > http://www.irlp.net > > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 24 > Date: Tue, 27 Apr 2004 16:40:03 -0400 > From: "Jim B." <[EMAIL PROTECTED]> > Subject: Re: Help on Interference > > Virden Clark Beckman wrote: > > > Rather than re-invent the wheel why not try carving the helical from a > > dead old high band rx tray and add to the front of yours to make it a > > bit narrower than it is barefoot, if you can find a mastr2 with 5 > > helicals you could ad a pre-amp and convert the near hits to misses. > > > > The problem isn't the front end-it's the low IF. Regency's just accept > more than they should. Sorta like the old Heathkit 2036. > > The Century will be somewhat of an improvement, but not near as much as > a MII or Micor would be. > -- > Jim Barbour > WD8CHL > > > > ________________________________________________________________________ > ________________________________________________________________________ > > Message: 25 > Date: Tue, 27 Apr 2004 15:37:23 -0500 > From: "Steve Bosshard" <[EMAIL PROTECTED]> > Subject: RE: Help on Interference > > No amount of filtering will resolve 2 signals occupying the same > overlapping spectrum. > > Steve > > > > > > > ________________________________________________________________________ > ________________________________________________________________________ > > > > > > ------------------------------------------------------------------------ > Yahoo! Groups Links > > > > > ------------------------------------------------------------------------ > > > 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/
