[Repeater-Builder] Co-Phasing two Sinclair SRL-210C4 repeater antennas
I wondered if anyone could give me some ideas on co-phasing two Sinclair SRL-210C4 repeater antennas together. They both have 50ohm impeadence. I think you would just use odd 1/4 wave electrical harness between the two. I know how to calculate the lenght of the coax. I have one top mounted with 1/4 wave spacing from the mast on my 200' tower that enhances the gain the way the dipole face, north. I have another 1/2 wave spacing from the mast and want extra gain twards the east-west which I would mount on the side of the tower below the other. How far apart should the bottom element of the first antenna and the top element of the second antenna? Thanks, Scott VA3EXT 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/
Re: [Repeater-Builder] Re: Noisy PLL Exciter
If physical shock won't find it you can frequently use thermal shock - some need cooling to locate, others need heat. The simple way is to get a can of freeze spray and zap one component at a time. However this does get expensive in a hurry. Aerosol canned ethyl chloride is a specialty item and priced as such. You also need to wash the zapped parts with alcohol when you are done - cheap brands of freeze spray have other things than propellant and ethyl chloride in them, and the contaminants can corrode certain alloys on component leads. Or if you know someone who has a cylinder of CO2 you can hook one side of a oxy-acetylene cutting torch rig to it and use the CO2 to cool one component at a time. I spent several years doing component level repair as one member of a tech group of 26 we took care of over 1,000 items from over 75 manufacturers at NASA / JPL. We had a dozen full sized workbenches and someone was always working on something - from IBM mainframe tape drives to surveillance video cameras to 1443 line printers to NBS-based clocks. We abandoned the freeze spray a few months after we stared using it because of the corrosion on certain alloys of components. The CO2 worked great as a coolant, but the cutting torch handle assembly was unwieldy and got heavy after an hour or so. One of the guys whose brother worked in the welding shop set us up with a solenoid valve on the tank feeding a pinpoint nozzle. We mounted that on a old burned up soldering gun. The trigger switch controlled the solenoid valve. Heat can be provided by a hair dryer on high setting, and the hot air run through a metal funnel (wrapped in a towel to protect your hands) so that only the component of interest gets zapped. Mike WA6ILQ At 01:10 PM 11/25/04, you wrote: >Jeff, I have a Mastr II station. A NHRC 3+ as the controller and >your DAD board. In the audio chain I'm also using a GE channel guard >board. The 3+, DAD board and CG board are in the same enclosure with >feed thru caps. I have disconnected the receiver and left the Pll >exciter audio hooked up. When I ground the PTT line no audio comes >thru except crackling and static, and it comes and goes. The PA is >not in line, the exciter is running alone into a dummy load. I've >tapped and wiggled all components and I can not find a spot where I >can get it to stop or start. I hope I've covered everything. > >Happy Thanksgiving to you and the group alsoJim km0k > > > >--- In Repeater-Builder@yahoogroups.com, Jeff Otterson ><[EMAIL PROTECTED]> wrote: > > Yes, possibly a bad capacitor anywhere in the audio chain. > > > > What else do you have connected up? A receiver? > > > > Happy Thanksgiving! > > > > Jeff > > > > > > > > At 11:09 AM 11/25/2004, you wrote: > > > > >--- In Repeater-Builder@yahoogroups.com, Jeff Otterson > > ><[EMAIL PROTECTED]> wrote: > > >Jeff, I disconnected the audio line to the exciter. NO Noise, so > > >then I disconnected the audio from the Rx. The noise was still > > >there. The only thing left is the NRHC 3+ controller. What would > > >generate noise there, Bad Cap? What should I look for? Tnx...Jim > > > > > > > > > > Bad capacitor in the audio stage? > > > > > > > > Jeff > > > > > > > > At 09:39 AM 11/25/2004, you wrote: > > > > > > > > > > > > >Hi group! > > > > >I have a vhf pll exciter that is very noisy, by that I mean > > >scratchy > > > > >sounds on the carrier. When I unplug the PA and run the >exciter > > > > >alone with no audio into a dummy load I get this noise, so I >know > > >it > > > > >is coming from > > > > >the exciter. I cleaned all the contacts that the audio and > > >bandpass > > > > >boards plug into and also the edge connecter plug, ICOM etc. > > >Touched > > > > >all posts with a touch of new solder, but still have it. > > > > >I even swapped audio and bandpass boards to no avail. So I > > >replaced > > > > >it with another exciter, and this one is a > > > > >lot quieter. What would cause this exciter to generate noise? >I > > > > >modified the Band Pass Filter from G2 to a G1 and replaced the > > > > >aluminum slug with a ferrite one. I would like to fix this >one if > > >I > > > > >can as they are hard to come by. Is there any suggestions >where I > > > > >should start looking? Has anyone else had this problem? >Thanks in > > > > >advance. > > > > > > > > > >Jim KMØK 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/
Re: [Repeater-Builder] GE MASTR ER41 Receiver Low Audio Output
Did that once, was not a good thing, Lost a good FT-5100 that way. Ok, will apply 12 volts and see what the results are. Mathew Sure will cause problems,it will throw the bias off causing all kinds of trouble.Best to feed it proper voltage or none at all.Try starting your car on 10 volts - Original Message - From: Mathew Quaife To: Repeater-Builder@yahoogroups.com Sent: Thursday, November 25, 2004 1:43 PM Subject: Re: [Repeater-Builder] GE MASTR ER41 Receiver Low Audio Output Ok, brings up a good question, I fed the 12 volts section with the 10 volts supply, would this drop of 2 volts cause a major drop in the audio out section? Mathew 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 the Yahoo! Terms of Service.
Re: [Repeater-Builder] GE MASTR ER41 Receiver Low Audio Output
Sure will cause problems,it will throw the bias off causing all kinds of trouble.Best to feed it proper voltage or none at all.Try starting your car on 10 volts - Original Message - From: Mathew Quaife To: Repeater-Builder@yahoogroups.com Sent: Thursday, November 25, 2004 1:43 PM Subject: Re: [Repeater-Builder] GE MASTR ER41 Receiver Low Audio Output Ok, brings up a good question, I fed the 12 volts section with the 10 volts supply, would this drop of 2 volts cause a major drop in the audio out section? Mathew 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 the Yahoo! Terms of Service.
[Repeater-Builder] Re: Noisy PLL Exciter
Jeff, I have a Mastr II station. A NHRC 3+ as the controller and your DAD board. In the audio chain I'm also using a GE channel guard board. The 3+, DAD board and CG board are in the same enclosure with feed thru caps. I have disconnected the receiver and left the Pll exciter audio hooked up. When I ground the PTT line no audio comes thru except crackling and static, and it comes and goes. The PA is not in line, the exciter is running alone into a dummy load. I've tapped and wiggled all components and I can not find a spot where I can get it to stop or start. I hope I've covered everything. Happy Thanksgiving to you and the group alsoJim km0k --- In Repeater-Builder@yahoogroups.com, Jeff Otterson <[EMAIL PROTECTED]> wrote: > Yes, possibly a bad capacitor anywhere in the audio chain. > > What else do you have connected up? A receiver? > > Happy Thanksgiving! > > Jeff > > > > > > At 11:09 AM 11/25/2004, you wrote: > > > >--- In Repeater-Builder@yahoogroups.com, Jeff Otterson > ><[EMAIL PROTECTED]> wrote: > >Jeff, I disconnected the audio line to the exciter. NO Noise, so > >then I disconnected the audio from the Rx. The noise was still > >there. The only thing left is the NRHC 3+ controller. What would > >generate noise there, Bad Cap? What should I look for? Tnx...Jim > > > > > > > Bad capacitor in the audio stage? > > > > > > Jeff > > > > > > At 09:39 AM 11/25/2004, you wrote: > > > > > > > > > >Hi group! > > > >I have a vhf pll exciter that is very noisy, by that I mean > >scratchy > > > >sounds on the carrier. When I unplug the PA and run the exciter > > > >alone with no audio into a dummy load I get this noise, so I know > >it > > > >is coming from > > > >the exciter. I cleaned all the contacts that the audio and > >bandpass > > > >boards plug into and also the edge connecter plug, ICOM etc. > >Touched > > > >all posts with a touch of new solder, but still have it. > > > >I even swapped audio and bandpass boards to no avail. So I > >replaced > > > >it with another exciter, and this one is a > > > >lot quieter. What would cause this exciter to generate noise? I > > > >modified the Band Pass Filter from G2 to a G1 and replaced the > > > >aluminum slug with a ferrite one. I would like to fix this one if > >I > > > >can as they are hard to come by. Is there any suggestions where I > > > >should start looking? Has anyone else had this problem? Thanks in > > > >advance. > > > > > > > >Jim KMØK > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >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/
Re: [Repeater-Builder] Dual Band Antenna for repeater use
Thanks John, I'm going to give it a try and see how it works. Can't do no more than be a disaster and just have to reunhook everything. Mathew > > I had a situation where I needed to do that at a repeater site in Sioux City, > Iowa. We had about 35 watts on the UHF & about 25 watts on the 2 meter, using > a Comet tri-band GP-15 ant 4160 diplexer. > > It's been operational for about 4 years, working fine. > > Certainly, mono-band antennas are best. But this replaced a Moto Comm-prod > 8DB stick on the UHF & we notice very little difference before/after. > > -- Original Message -- > Received: Thu, 25 Nov 2004 09:58:51 AM CST > From: "w9mwq" <[EMAIL PROTECTED]> > To: Repeater-Builder@yahoogroups.com > Subject: [Repeater-Builder] Dual Band Antenna for repeater use > > > > > > > I know what this question can lead to, and I know dual band > > antenna's are not recommended for use on repeaters, but this is a > > short term use, (Winter), need. Is there anyone that is using a > > dual band atenna on their repeater system with a duplexer to split > > the two bands. What I am attempting to do for the winter is use > > this dual band antenna for both a 2 meter and a 440 repeater tied to > > the same controller. The 440 repeater will then be receiving some > > two meter remote bases. What will I expect to see with both > > transmitters running at the same time, as well as the receiver > > sensitivity. The 2 meter is running 78 watts from the duplexer and > > the 440 is running 20 watts from the duplexer. Any thoughts on this? > > > > Mathew > > > > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > > 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/
Re: [Repeater-Builder] Dual Band Antenna for repeater use
I had a situation where I needed to do that at a repeater site in Sioux City, Iowa. We had about 35 watts on the UHF & about 25 watts on the 2 meter, using a Comet tri-band GP-15 ant 4160 diplexer. It's been operational for about 4 years, working fine. Certainly, mono-band antennas are best. But this replaced a Moto Comm-prod 8DB stick on the UHF & we notice very little difference before/after. -- Original Message -- Received: Thu, 25 Nov 2004 09:58:51 AM CST From: "w9mwq" <[EMAIL PROTECTED]> To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Dual Band Antenna for repeater use > > > I know what this question can lead to, and I know dual band > antenna's are not recommended for use on repeaters, but this is a > short term use, (Winter), need. Is there anyone that is using a > dual band atenna on their repeater system with a duplexer to split > the two bands. What I am attempting to do for the winter is use > this dual band antenna for both a 2 meter and a 440 repeater tied to > the same controller. The 440 repeater will then be receiving some > two meter remote bases. What will I expect to see with both > transmitters running at the same time, as well as the receiver > sensitivity. The 2 meter is running 78 watts from the duplexer and > the 440 is running 20 watts from the duplexer. Any thoughts on this? > > Mathew > > > > > > > > > > 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/
Re: [Repeater-Builder] GE MASTR ER41 Receiver Low Audio Output
Ok, brings up a good question, I fed the 12 volts section with the 10 volts supply, would this drop of 2 volts cause a major drop in the audio out section? Mathew Matt, no it is not worth the trouble. Just feed only the 10 volt section. That will disable the audio. The 12 volts is only used for audio out. Dave Dave BaughnDirector of EngineeringThe University of AlabamaCenter for Public Television and RadioBox 870150Tuscaloosa, Alabama 35487205.348.8622 cell 205-310-8798NEW EMAIL [EMAIL PROTECTED]>>> [EMAIL PROTECTED] 11/23/04 01:13PM >>> Ok found all of that, this is the E version. I checked the voltage on the transitor, its about 1/2 of what it should be. I just wonder if this low audio will hamper the use of it any in the repeater situation. The sensitivity of the receiver is excellent, at .17 Uv at 12 DB. I am using the discriminator audio portion of it. What do you think. Is it worth the trouble to repair it, since I will never need to use the audio output of the receiver. Mathew Matt, it is likely the audio output transistor. ER41 comes in two versions. One has about 2 watts of audio from one transistor. The other has two transistors and about 10 watts out. In both cases the transistors are mounted underneath the receiver on a tab on the heatsink. If yours has tone, you will have to loosen the tone board to see the transistor(s). I have seen the one transistor version fail where it will still have some audio. The two transistor version sometimes has a small resistor in the bias circuit that changes value. In this case, the audio will usually also be quite distorted. I think it is 240 ohms or so. I don't have the diagram here now. Seems like the metering socket has a pin to check the bias on the output transistor. If it cannot be adjusted into specs, the transistor or the resistor are the most likely suspects from my experience, although I have seen other problems.nd where to look. I have not done any trouble shooting at this point, but thought by chance if is was a common problem someone could point me in the right direction. Thanks.MathewYahoo! 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/ Dave BaughnDirector of EngineeringThe University of AlabamaCenter for Public Television and RadioBox 870150Tuscaloosa, Alabama 35487205.348.8622 cell 205-310-8798NEW EMAIL [EMAIL PROTECTED] 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 the Yahoo! Terms of Service.
Re: [Repeater-Builder] Re: Noisy PLL Exciter
jimbob50613 wrote: >Jeff, I disconnected the audio line to the exciter. NO Noise, so >then I disconnected the audio from the Rx. The noise was still >there. The only thing left is the NRHC 3+ controller. What would >generate noise there, Bad Cap? What should I look for? Tnx...Jim > This particular problem surfaces with some NHRC controllers when the audio level to the controller is high. The particular FET NHRC has chosen for audio muting will let some audio peaks come through when the audio level is high, like when driven from the Vol/Sq. high from a GE Mastr type receiver. The problem with a discrete FET mute is that you need to keep the peak-to-peak audio levels much lower to avoid non-linear effects of the FET. Why? As the audio tends to move the source voltage around, it affects the conduction of the switch. I know you state you disconnected the audio from the receiver and the noise was still there, but I wonder if you were mistaken about actually disconnecting the audio, or if there was any other audio source still connected. If audio is actually still connected and the problem is the result of audio that is too high making the FET conduct, there are two solutions. One is reduce the audio coming into the controller by setting the level of the receiver control pot lower. This can result in not enough audio getting to the transmitter (even with the TX pot full) and audio balance can be difficult to achieve in some types of radio sets. The other solution is to replace the muting FET with something better like a PN4393. Kevin Custer 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/
Re: [Repeater-Builder] IC 2720
> From: "Mr. Edgar McKinney" <[EMAIL PROTECTED]> > Date: Thu, 25 Nov 2004 11:45:04 -0500 > Subject: Re: [Repeater-Builder] IC 2720 > > I now have 3 2720s and yes they are ham rigs. Also, They are tuned for local > comercial freq that we do church ops on as well commercial freq for Severe > Weather Research. > How did you manage to get them type accepted for transmission on Part 90 bands? de kg7yy 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: Repeater Interference (duplexer)
Depends on the length... 1/4 wave is high Z on one end, low Z on the other end. 1/2 wave "repeats the impedance found on the end. cheers, skipp > mch <[EMAIL PROTECTED]> wrote: > OK. I always get those mixed up. So, the shorted stub passes nothing > except the tuned frequency, right? > > Joe M. > > skipp025 wrote: > > > > > mch <[EMAIL PROTECTED]> wrote: > > > RG174 should still work, right? BTW, I came > > > up with 158' 1.3". > > > Joe M. > > > > > > > No, RG-174 is not good for this application. > > > > The shorted stub should be cut for the UHF > > Band, not the broadcast band frequency. > > > > skipp > > 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/
Re: [Repeater-Builder] Dual Band Antenna for repeater use
The antenna is indeed the Diamond X500, and at this point I have not had any noice that I have detected thus far. Just need to make this setup work until next spring when the tower will go up fo rthe repeater and the Decible Products antenna's are in place and the beams for the remote receiver sites. I was just not sure if the antenna can handle the transmit of both signals at the same time. Mathew > > I'll answer you honestly without flaming you :) If you use an antenna > such as the Diamond X700HNA (my preference in cheesy antennas), or the > Diamond X500HNA, they will both work well. You should take them apart > and SOLDER (I used silver solder) all the joints. I did this on my > X700HNA, and it works quite well. There is very little noise caused by > the antenna.. These two models seem to handle the power the best as > well. One of my UHF machines can put out 160 watts out of the duplexers > and it deals with it at high duty cycle. > > James > > w9mwq wrote: > > >I know what this question can lead to, and I know dual band > >antenna's are not recommended for use on repeaters, but this is a > >short term use, (Winter), need. Is there anyone that is using a > >dual band atenna on their repeater system with a duplexer to split > >the two bands. What I am attempting to do for the winter is use > >this dual band antenna for both a 2 meter and a 440 repeater tied to > >the same controller. The 440 repeater will then be receiving some > >two meter remote bases. What will I expect to see with both > >transmitters running at the same time, as well as the receiver > >sensitivity. The 2 meter is running 78 watts from the duplexer and > >the 440 is running 20 watts from the duplexer. Any thoughts on this? > > > >Mathew > > > > > > > > > > > > > > > > > > > >Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > > > > > 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/
Re: [Repeater-Builder] IC 2720
I now have 3 2720s and yes they are ham rigs. Also, They are tuned for local comercial freq that we do church ops on as well commercial freq for Severe Weather Research. Verry well built rig. kb8qeu Robert Grizzard wrote: > It is a ham rig. The problem I can see is if the 2 meter side is carrier > controlled the user will have to wait for the repeater to time out to use the > '2720. The repeater on the 2 meter side will need to transmit either DCS or > tone to make this work without making the user wait for carrier drop. > > Again, it isn't type accepted for commercial frequencies. I have this radio > and like it quite a bit; nevertheless, I flat missed the frequency ranges of > interest the first time I saw this question. > > de kg7yy > > -Original Message- > From: "Jim B." <[EMAIL PROTECTED]> > Sent: Nov 24, 2004 10:37 AM > To: Repeater-Builder@yahoogroups.com > Subject: Re: [Repeater-Builder] IC 2720 > > What is an IC-2720? If it's a ham rig, it's not type accepted for the > commercial freqs you mention (at least in the US), so it cannot be used > for this purpose. > And even if you use type-accepted gear, as someone else pointed out, > licensing that UHF freq for a link will be difficult, if not impossible. > Again, I'm assuming you're in the US. > -- > Jim Barbour > WD8CHL > > > Yahoo! Groups Links > > > > > 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/
Re: [Repeater-Builder] Re: Noisy PLL Exciter
Yes, possibly a bad capacitor anywhere in the audio chain. What else do you have connected up? A receiver? Happy Thanksgiving! Jeff At 11:09 AM 11/25/2004, you wrote: >--- In Repeater-Builder@yahoogroups.com, Jeff Otterson ><[EMAIL PROTECTED]> wrote: >Jeff, I disconnected the audio line to the exciter. NO Noise, so >then I disconnected the audio from the Rx. The noise was still >there. The only thing left is the NRHC 3+ controller. What would >generate noise there, Bad Cap? What should I look for? Tnx...Jim > > > > Bad capacitor in the audio stage? > > > > Jeff > > > > At 09:39 AM 11/25/2004, you wrote: > > > > > > >Hi group! > > >I have a vhf pll exciter that is very noisy, by that I mean >scratchy > > >sounds on the carrier. When I unplug the PA and run the exciter > > >alone with no audio into a dummy load I get this noise, so I know >it > > >is coming from > > >the exciter. I cleaned all the contacts that the audio and >bandpass > > >boards plug into and also the edge connecter plug, ICOM etc. >Touched > > >all posts with a touch of new solder, but still have it. > > >I even swapped audio and bandpass boards to no avail. So I >replaced > > >it with another exciter, and this one is a > > >lot quieter. What would cause this exciter to generate noise? I > > >modified the Band Pass Filter from G2 to a G1 and replaced the > > >aluminum slug with a ferrite one. I would like to fix this one if >I > > >can as they are hard to come by. Is there any suggestions where I > > >should start looking? Has anyone else had this problem? Thanks in > > >advance. > > > > > >Jim KMØK > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > >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/
Re: [Repeater-Builder] Dual Band Antenna for repeater use
I'll answer you honestly without flaming you :) If you use an antenna such as the Diamond X700HNA (my preference in cheesy antennas), or the Diamond X500HNA, they will both work well. You should take them apart and SOLDER (I used silver solder) all the joints. I did this on my X700HNA, and it works quite well. There is very little noise caused by the antenna.. These two models seem to handle the power the best as well. One of my UHF machines can put out 160 watts out of the duplexers and it deals with it at high duty cycle. James w9mwq wrote: >I know what this question can lead to, and I know dual band >antenna's are not recommended for use on repeaters, but this is a >short term use, (Winter), need. Is there anyone that is using a >dual band atenna on their repeater system with a duplexer to split >the two bands. What I am attempting to do for the winter is use >this dual band antenna for both a 2 meter and a 440 repeater tied to >the same controller. The 440 repeater will then be receiving some >two meter remote bases. What will I expect to see with both >transmitters running at the same time, as well as the receiver >sensitivity. The 2 meter is running 78 watts from the duplexer and >the 440 is running 20 watts from the duplexer. Any thoughts on this? > >Mathew > > > > > > > > > >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/
[Repeater-Builder] Re: Noisy PLL Exciter
--- In Repeater-Builder@yahoogroups.com, Jeff Otterson <[EMAIL PROTECTED]> wrote: Jeff, I disconnected the audio line to the exciter. NO Noise, so then I disconnected the audio from the Rx. The noise was still there. The only thing left is the NRHC 3+ controller. What would generate noise there, Bad Cap? What should I look for? Tnx...Jim > Bad capacitor in the audio stage? > > Jeff > > At 09:39 AM 11/25/2004, you wrote: > > > >Hi group! > >I have a vhf pll exciter that is very noisy, by that I mean scratchy > >sounds on the carrier. When I unplug the PA and run the exciter > >alone with no audio into a dummy load I get this noise, so I know it > >is coming from > >the exciter. I cleaned all the contacts that the audio and bandpass > >boards plug into and also the edge connecter plug, ICOM etc. Touched > >all posts with a touch of new solder, but still have it. > >I even swapped audio and bandpass boards to no avail. So I replaced > >it with another exciter, and this one is a > >lot quieter. What would cause this exciter to generate noise? I > >modified the Band Pass Filter from G2 to a G1 and replaced the > >aluminum slug with a ferrite one. I would like to fix this one if I > >can as they are hard to come by. Is there any suggestions where I > >should start looking? Has anyone else had this problem? Thanks in > >advance. > > > >Jim KMØK > > > > > > > > > > > > > > > > > > > >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/
[Repeater-Builder] Dual Band Antenna for repeater use
I know what this question can lead to, and I know dual band antenna's are not recommended for use on repeaters, but this is a short term use, (Winter), need. Is there anyone that is using a dual band atenna on their repeater system with a duplexer to split the two bands. What I am attempting to do for the winter is use this dual band antenna for both a 2 meter and a 440 repeater tied to the same controller. The 440 repeater will then be receiving some two meter remote bases. What will I expect to see with both transmitters running at the same time, as well as the receiver sensitivity. The 2 meter is running 78 watts from the duplexer and the 440 is running 20 watts from the duplexer. Any thoughts on this? Mathew 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/
Re: [Repeater-Builder] Noisy PLL Exciter
At 10:34 AM 11/25/2004 -0500, you wrote: > >Bad capacitor in the audio stage? <---I fixed a Repco repeater for a local ham that had this exact problem. An interstage coupling cap developed an internal intermittent connection and the xmt audio would crackle as temperature shifted. Physical movement would also cause crackling. Amazing what one bad .1 cap can do :-) Ken -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html We now offer complete Kenwood TKR repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net 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/
Re: [Repeater-Builder] Noisy PLL Exciter
Bad capacitor in the audio stage? Jeff At 09:39 AM 11/25/2004, you wrote: >Hi group! >I have a vhf pll exciter that is very noisy, by that I mean scratchy >sounds on the carrier. When I unplug the PA and run the exciter >alone with no audio into a dummy load I get this noise, so I know it >is coming from >the exciter. I cleaned all the contacts that the audio and bandpass >boards plug into and also the edge connecter plug, ICOM etc. Touched >all posts with a touch of new solder, but still have it. >I even swapped audio and bandpass boards to no avail. So I replaced >it with another exciter, and this one is a >lot quieter. What would cause this exciter to generate noise? I >modified the Band Pass Filter from G2 to a G1 and replaced the >aluminum slug with a ferrite one. I would like to fix this one if I >can as they are hard to come by. Is there any suggestions where I >should start looking? Has anyone else had this problem? Thanks in >advance. > >Jim KMØK > > > > > > > > > >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/
[Repeater-Builder] Noisy PLL Exciter
Hi group! I have a vhf pll exciter that is very noisy, by that I mean scratchy sounds on the carrier. When I unplug the PA and run the exciter alone with no audio into a dummy load I get this noise, so I know it is coming from the exciter. I cleaned all the contacts that the audio and bandpass boards plug into and also the edge connecter plug, ICOM etc. Touched all posts with a touch of new solder, but still have it. I even swapped audio and bandpass boards to no avail. So I replaced it with another exciter, and this one is a lot quieter. What would cause this exciter to generate noise? I modified the Band Pass Filter from G2 to a G1 and replaced the aluminum slug with a ferrite one. I would like to fix this one if I can as they are hard to come by. Is there any suggestions where I should start looking? Has anyone else had this problem? Thanks in advance. Jim KMØK 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] Need Help: Cushman CE6030 Monitor
Is there anyone on the list that is familiar and versitle with the Cushman CE-6030 series of service monitors that could help me. I need some assistance on how to read the sensitivity dial better than what I am. All help would be greatly appreciated. Mathew 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/
Re: [Repeater-Builder] mobile antenna question
Tony King - W4ZT wrote: > My question is, how much physical separation must I have between the > VHF/UHF antennas to prevent damaging either radio while transmitting on the > other? I've always used a rule of thumb of 1/4 wave plus a little at the lowest frequency. In other words, in this case, about 20 inched should work fine. > > Thanks for your opinions and Happy Thanksgiving! Just remember, these are just opinions. Your mileage may vary. 73 Mike 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/
Re: [Repeater-Builder] GE-Moto (antenna relay question)
On Tuesday 23 November 2004 01:40 pm, Mike WA6ILQ wrote: > Do you have a spare digital output and a spare digital > input? Can you trigger a timer on an input going > inactive? If so, add a 555 timer chip outside. Yes, Yes, and Aha! Thanks for the idea. If I do that I will have used up all my digital inputs but it certainly is another option worthy of serious consideration. Paul N1BUG 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: Help with circulator specs
--- In Repeater-Builder@yahoogroups.com, Joe Ciarcia <[EMAIL PROTECTED]> wrote: > Bob it may be the same one. It measures 9 X 9 1/4 inches and is fairly heavy. > The output to input port loss is 20 dB at the ends of it's coverage and 40 dB > at the tuned frequency. The 3 dB bandwidth is about 3 Mhz. > Do you have tuning instructions? > > Joe I don't remember it having any tuning adjustments, but I could be wrong-it's been a while since I've seen one. If all else fails I can ask my friend who still has one. Are you saying it's very lossy at 2 meters right now? Bob 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: Duplexor Specs DB-4050
--- In Repeater-Builder@yahoogroups.com, "S. Stepanek" <[EMAIL PROTECTED]> wrote: "... Does somebody have the catalog/specs page for DB-4050 duplexer..." __ _ "Model DB-4050 is designed for stations operating with close frequency spacing in the 148-174 MHz band." Frequency separation: 300 KHz or more Maximum power input: 400 Watts Insertion loss Tx to antenna: 2.2 dB Insertion loss Rx to antenna: 2.2 dB Tx noise suppression: 95 dB Rx isolation at Tx freq.: 95 dB Maximum VSWR: 1.5:1 Temperature range: -30C to +60C Number of cavity filters: 8 Connector terminations: UHF female 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/
Re: [Repeater-Builder] Help with circulator specs
Bob it may be the same one. It measures 9 X 9 1/4 inches and is fairly heavy. The output to input port loss is 20 dB at the ends of it's coverage and 40 dB at the tuned frequency. The 3 dB bandwidth is about 3 Mhz. Do you have tuning instructions? Joe At 03:17 PM 11/22/2004 -0800, you wrote: >At 11/21/2004 11:01 AM, you wrote: > > >Joe, > > > >I suspect that RJ Communications is no longer in business, so finding > >tech data on that circulator may be difficult. > >I know someone who has one of these & sold many more (if we're talking the >same model; is it rather large for a VHF circulator?). IIRC the >performance on 2 meters was excellent: 0.3 dB forward loss & ~30 dB reverse. > > > >The typical ferrite circulator doesn't dissipate much power itself; it's > >the load(s) attached to the reject port that determines its power > >rating. > >If you expect it to handle 100% reflected power, yes. Circulators do have >their own power ratings - you can't slap a 1 KW load on one & expect it to >handle that much power. The lesser of the two (circulator & load) >determines the power it can handle under any conditions, but in a pinch you >can put as much power in as the circulator can handle so long as the power >reflected back does not exceed the rating of the load. Of course if your >antenna unexpectedly goes bad you'll fry the circulator load. > > > >It's important that a circulator be correctly tuned to operate > >efficiently. The label 140-180 MHz refers to the range of that > >particular design, and should not be taken to mean that it will work at > >any frequency in that range. > >Again, if we're talking about the same circulator, it's rather broad. It >worked just fine all across the 2 meter band & then some, with no tuning. > > > Nearly all of the circulators I have taken > >out of service from the 152 MHz band would not tune more than 2 MHz > >either side of the frequency marked on the unit. I had to send them > >back to the manufacturer to be reworked for operation on the 2m band. > >This rework involved an exchange of magnets, pole pieces, and a new > >garnet ground to a specific tolerance. > > > >A network analyzer is a must for tuning a circulator, especially a dual > >circulator, since some measurements look for transmission peaks while > >others look for return-loss peaks. A spectrum analyzer will not suffice > >for this tuning task, unless it is used with a return-loss bridge. > >This is not true. I've tuned all my circulators using only transmission >measurements (forward & reverse). > >Bob NO6B > > > > > > > >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/
[Repeater-Builder] Duplexor Specs DB-4050
Searching the web has come up nada... Does somebody have the catalog/specs page for DB-4050 duplexers that they could send me? Thanks... Sean / NØPBA 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/
RE: [Repeater-Builder] Supplier of bi-directional RF amps.
Sorry - meant to inlcude frequency - senior brain fade - hi! 420/470MHz. Tks Jack (:>) -Original Message-From: Paul Guello [mailto:[EMAIL PROTECTED]Sent: 24 November 2004 00:20To: Repeater-Builder@yahoogroups.comSubject: Re: [Repeater-Builder] Supplier of bi-directional RF amps. What frequency or band does it need to operate on? Paul kb9wlcJack Hood <[EMAIL PROTECTED]> wrote: Hi Folks!I wonder if you can help? I am looking for suppliers of low power (around +20dBM) in building bi-directional amplfiers. It doesn't matter if the suppler is US or Europe based.Thanks in anticipation.Jack (:>)GM4COXYahoo! 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/ Do you Yahoo!?Discover all thats new in My Yahoo! 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 the Yahoo! Terms of Service.
Re: [Repeater-Builder] Repeater Interference
Hello list, I have a novel idea... Remove the new duplexer you bought and replace it with the 6-pack mobile duplexer without the problem:) Most repeater owners will agree if it's not broke "DON'T" fix it! Regards, Barry --- Neal Newman <[EMAIL PROTECTED]> wrote: > First off You changed the Duplexer? > how about the cables? > I have found that a bad connection or Oxidation acts > as a diode. and > will allow the AM stations Audio to be heard.. I > have this problem with > a telco Box the Phone company placed > Exactly 1/4 wavelength away From My 10 kw AM > trnamitter.. Everyone in > the Neighborhood hears my radio station on their > Phones.. But its Not my > problem... Its some Engineers problem at thePhone > Company. How stupid > can One Be.. I know the answer He has an > Engineering degree In theory > It should Be ok where it s... NOT... > > Mark Holman wrote: > > >I would get in touch with the station Engineer and > ask him or her if they > >may adjusted something, added or removed anything > within the past time frame > >that this interference started. If they say No > then you may have something > >on your end just went out. > > > >I would start with the Ground to see if the > continuity of Resistance is Zero > >Ohms. from Chasis, Cabinet, rack, etc.. especially > green crud from moisture > >will start a resistance path to ground. > > > >a good oscilloscope check will indicate > intermittent, as well a VOM check. > > > >Good Hunting ! > > > >Mark Holman, CRO > >AB8RU > >- Original Message - > >From: "Jeff Thomas" <[EMAIL PROTECTED]> > >To: > >Sent: Tuesday, November 23, 2004 6:25 PM > >Subject: Re: [Repeater-Builder] Repeater > Interference > > > > > > > > > >>Thanks Mike, > >> > >>The station is 1420 AM. > >> > >>Nothing else was changed besides the duplexer. > >> > >>The AM station audio is audible during the entire > time the repeater > >>transmitter is transmitting, even during the hang > time. > >> > >>It is a much lower level compared to the repeated > audio and it is > >>perfectly > >>clear. I could hear everything Rush Limbaugh was > saying. > >> > >>Thanks for your help. > >>Jeff - W2JRT > >> > >> > >>- Original Message - > >>From: "Mike WA6ILQ" <[EMAIL PROTECTED]> > >>To: > >>Sent: Tuesday, November 23, 2004 1:29 PM > >>Subject: Re: [Repeater-Builder] Repeater > Interference > >> > >> > >> > >> > >>>At 07:43 AM 11/23/04, you wrote: > >>> > >>> > >>> > I have a 70cm repeater that is located about .75 > mile from a commercial > radio station. > > I was using a Cellwave Notch type mobile > duplexer and experienced no > problems what so ever. Recently I purchased a > new Sinclair Bp/Br Q318GR, > 4 > cavity duplexer and replaced the Cellwave. This > morning I have noticed > that > the nearby radio station is now coming through > on the repeaters > transmitted > signal. > > Anyone have an idea what causes this and how to > get rid of it? > > Thanks, > Jeff > > > >>>Is the station AM or FM ??? > >>> > >>>What else was changed besides swapping out the > duplexer? > >>> > >>>Is the station audio audible during the received > signal only, or is it > >>>also there during the carrier delay ?? (the time > period that the TX is > >>>still up after the RX squelch closes and before > the repeater carrier > >>>drops). > >>> > >>>Can you hear it under the ID? > >>> > >>>How loud is it compared to user audio or ID > audio? > >>> > >>>Mike WA6ILQ > >>> > >>> > >>> > >>> > >>> > >>> > >>>Yahoo! Groups Links > >>> > >>> > >>> > >>> > >>> > >>> > >>> > >>> > >>> > >>> > >>> > >> > >> > >> > >> > >> > >> > >>Yahoo! Groups Links > >> > >> > >> > >> > >> > >> > >> > >> > >> > > > > > > > > > > > > > >Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > __ Do you Yahoo!? Yahoo! Mail - Helps protect you from nasty viruses. http://promotions.yahoo.com/new_mail 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] mobile antenna question
Slightly off topic but here goes: Just got a new FT-897D at the hamfest and want to run it along with the Alinco DR-600 in the truck. My question is, how much physical separation must I have between the VHF/UHF antennas to prevent damaging either radio while transmitting on the other? Thanks for your opinions and Happy Thanksgiving! 73, Tony W4ZT 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/
Re: [Repeater-Builder] Re: Repeater Interference (duplexer)
OK. I always get those mixed up. So, the shorted stub passes nothing except the tuned frequency, right? Joe M. skipp025 wrote: > > > mch <[EMAIL PROTECTED]> wrote: > > RG174 should still work, right? BTW, I came > > up with 158' 1.3". > > Joe M. > > > > No, RG-174 is not good for this application. > > The shorted stub should be cut for the UHF > Band, not the broadcast band frequency. > > skipp > > > 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/
