Re: [Repeater-Builder] Wacom WP-639 Duplexer question
I'm afraid your wasting your time. According to the document for the Wacom 639 duplexer, this is what it says: MIN. FREQ. SPACING: 600 KHz POWER: TO 200 WATTS Notice that it says TO 200 watts. That would be if you were at 2MHz of spacing or more. You are only at 600KHz spacing, so you power level will be much less. I know it's not what you want to hear, but I believe you have the wrong duplexer for a 100 watt solid state repeater. 73, Joe, K1ike On 9/8/2010 9:18 PM, Richard Kelly wrote: Good evening Eric, Maybe this is why when the trasmit power is dropped to the 20-50 watt range, the receive opens way up like it should. However, according to the spec sheets regarding the Wacom SP-639 Duplexer, it is rated for 200 watts. So, again, not sure what's going on. We will be trying other things such as adding a second ground rod outside the shack instead of the single one we use now. We will also try isolating the amp some more and replacing the coax feed line with hard line. Thank you very much. We will be contacting Wacom directly tomorrow. Rich Kelly, W2RRK
Re: [Repeater-Builder] no power out of duplexer
What make and model is the duplexer? I know of one instance that the loop inside the duplexer can come disconnected due to a bad solder joint, but can't remember what one it was. A search on this list should find it, as it was discussed recently. The first thing would be to check all connections for tightness. Do not over-tighten the connections! Just make sure that they are snug. If your knuckles are turning white, your tightening too much. N connectors need to be snug, UHF connectors need to be a little tighter, but not cranked down tight, but not until they break. What you can do is take the connecting cables off the transmit side cans and test the first one for power out. Then connect the next can in series and see if there is output from that can. This process should isolate the bad can(s). Disconnect the receiver while doing this just to be safe. MARK all the cables as to where they came from. Do not mix them up. It may be a bad cable, so if you find a problem make sure that it is not the interconnecting cable. If all the cans and cables test OK, their may be a problem on the receive side of the duplexer. Keep it simple, don't fool with the cans unless you prove that one is bad. This process is to eliminate the obvious before you go tinkering with the duplexer. Check the tightness of connections first, cables second, and lastly the cans. The process above will help you isolate the bad can so you hopefully only have to tinker with one can. The real fix would involve some test equipment. What do you have available? Service monitor, tracking generator? Others will probably have some good suggestions, these ideas are just off the top of my head. On 9/6/2010 9:37 AM, W3ML wrote: Hi, First, let me say that we are still new to the repeater business and learning as we go. This the first time in 30 ham years that I have been involved with a VHF repeater system. Our repeater was working okay at 80 watts out of GE Mastr II and 60 watts out of Duplexer. When I turn the power up to 100 out of radio and 80 out of duplexer it seemed to be working okay. But, now a few hours later there is no power coming out of duplexer at all. Radio still shows power coming out. Nothing was touch on the duplexer. Any ideas? 73 John, W3ML
Re: [Repeater-Builder] Re: no power out of duplexer SOLVED with more questions
I agree with Mike. 100 watts in, 70 watts out is about 1.5dB loss. That looks very good for a Wacom. What is the model of your duplexer? The WP-643 had a single bandpass can on each side that might change the estimated loss. Did you happen to look at the reflected power when you took the forward power readings? If you had reflected power, it could throw the forward reading off. What kind of a watt meter did you use? As long as you have no desense, I'd leave it alone. 73, Joe, K1ike On 9/6/2010 11:28 AM, Mike Besemer (WM4B) wrote: WACOM specs their 6 cavity pass-reject cans at 2.2dB insertion loss. 2.0 dB down from 100 watts is 63 watts, so you’re doing good. Remember, 3dB is going to take your power down 50%. 73, Mike WM4B *From:* Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] *On Behalf Of *W3ML *Sent:* Monday, September 06, 2010 10:55 AM *To:* Repeater-Builder@yahoogroups.com *Subject:* [Repeater-Builder] Re: no power out of duplexer SOLVED with more questions Thanks Joe. We did most of those and then found the problem. The T-connector center pin had broken off when we apparently hooked up some test equipment and did not notice it. I still have one question though. Is it normal to have 100 watts coming out of radio and only 70 watts coming out of duplexer? Wacom 6 can type duplexer. That seems to be quite a loss. Again I appreciate all the help. 73 John, W3ML Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) * To change settings via email: repeater-builder-dig...@yahoogroups.com repeater-builder-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: repeater-builder-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: no power out of duplexer SOLVED with more questions
I agree. Put it back to the original output. I always like to turn my stuff back at least 10%. Turn the beep tone up in volume, tell them you increased the power. see what they say. 73, Joe, K1ike On 9/6/2010 5:04 PM, Paul Plack wrote: John, here's a more subtle lesson on repeaters, and it has nothing to do with hardware... If you dial the power back 1 dB, your PA may be much happier. If you simultaneously change the courtesy beep to be 10% faster, users will ask you what's changed on the repeater. Tell them you've increased the transmitter output 3 dB, and they'll claim to have noticed the improved coverage. Tell him guys...am I wrong? ;^) 73, Paul, AE4KR - Original Message - *From:* Tim Sawyer mailto:tisaw...@gmail.com *To:* Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com *Sent:* Monday, September 06, 2010 2:43 PM *Subject:* Re: [Repeater-Builder] Re: no power out of duplexer SOLVED with more questions
Re: [Repeater-Builder] (unknown)
After retiring from cellular/paging tech work after 20 years I had a box of about 100 or more keys that I kept in my truck. These were not equipment keys, but were site lock keys from shelters, buildings, etc. Locks were changed so many times at some of the sites and I always kept the old keys just in case. Some were marked, most were not. I spent a few early morning call-outs going thru the key box trying to get into a site, sometimes I was successful. This was probably one of the more frustrating parts of my job, getting to an abandoned warehouse in the wrong part of the city and spending lots of time trying to open a lock while I looked over my shoulder. I loved my job, but this is the part that I don't miss. 73, Joe, K1ike On 8/30/2010 11:26 AM, John wrote: Including all the different site keys John
Re: [Repeater-Builder] ariels
Hi Steve, Yup, Ariel was the mermaid in The Little Mermaid. Anyone who had a little girl in the house has this movie imprinted on their brain after seeing it replayed millions of times. If you waited long enough, the VHS tape finally broke Joe On 8/30/2010 12:03 PM, Steve wrote: How true Kev, Iam from the UK and it is spelt AERIAL. But I do know that others use ant, Ae, but it is common sense really 73 Steve
Re: [Repeater-Builder] Re: Wouxun Radio
Well, some will be appliance operators, but a few will take an interest and become the future of ham radio. We need the head count to keep our hobby alive and well. I've seen many new hams that had no background in electronics get their ticket by memorizing the test. They then dove into the hobby and became true assets to the hobby. Others just like to talk, and that's OK too. I guess I'm and optimist. Oh, I've been doing this ham radio since 1958, so I think I can say the above with some creditability. Welcome to all the new hams, no matter how you got your ticket. 73, Joe, K1ike On 8/31/2010 1:21 AM, Barry wrote: Much the same on the base permit here in Au but what do I know after 30+ years of yabering To: Repeater-Builder@yahoogroups.com From: glennmaill...@bellsouth.net Date: Mon, 30 Aug 2010 23:09:42 -0400 Subject: RE: [Repeater-Builder] Re: Wouxun Radio Welcome to the new hams that are taught the test and have no idea what the questions mean. 73 Glenn WB4UIV Ham of the old school. Had to draw schematics and understand what they were about to get my license.
Re: [Repeater-Builder] Duplexers
I've never had a problem. I would say that if the duplexers are out of tune on the transmit side there is a possibility that they might get hot, then cool off. This may cause them to take in moist air and cause condensation. I've never seen it happen, but I can see how it could. 73, Jow, K1ike On 8/31/2010 2:05 PM, ka9qjg wrote: OK Great , Thanks to Everyone who answered , I will sleep better now one less thing to worry about
Re: [Repeater-Builder] Legacy Radios Still in Service
I worked on one of these this past year. It's still in service as a backup radio for a dispatch center. Still keeps on ticking except for the $^#*^% buttons that get dirty and cause problems. 73, Joe, k1ike On 8/25/2010 2:09 PM, skipp025 wrote: How much time has passed since RCA sold their last Land Mobile Radio? Check out Ebay Auction Listing: 370424289376 for a bit of history. It's an RCA Tac-200 radio
[Repeater-Builder] Spectrum Comms SCR200A 220 receiver question
I've been working on a clubs 223.96Mhz repeater that the receiver lost sensitivity. It went deaf, so much that the squelch would not even work. It appears that the plastic variable capacitors in the front end have gone bad. It was in a very damp water tank environment and this summer was just too much for it. Anyway, has anyone found a good ceramic replacement for the plastic caps that are a drop-in replacement for the plastic caps in a Spectrum receiver? I think I'm just going to change them all and be done with it. The caps in the 220 version of the receiver are 20 picofarads. The club has 5 more Spectrum receivers that will probably need cap replacement too, some on 2 meters, 440 and 220. I only want to do this once and make it an easy repair. If I found a good replacement part I'll buy a load of them in various sizes. It seems that there is a very low interest in repeater repair over the years. I get many requests for fixing repeaters, and I'm surprised that it is so hard get someone to even hold the flashlight. It's discouraging.I would like to see some interest for the future of repeaters and ham radio. Others experiencing this? The younger hams just don't seem to have the curiosity that I had years ago. 73, Joe, k1ike
Re: [Repeater-Builder] Spectrum Comms SCR200A 220 receiver question
Hello Ross, I'm glad to hear that you are interested in repeaters! I hope that someone in your area elmers you so that the tradition can continue. Repeaters are a difficult thing to just jump into and the test equipment that is nice to have can get expensive. 73, Joe, K1ike On 8/24/2010 5:20 PM, Ross Johnson wrote: Others experiencing this? The younger hams just don't seem to have the curiosity that I had years ago. 73, Joe, k1ike Except for me!!! And I thank this whole group for making it possible. Ross www.kc7rjk.net http://www.kc7rjk.net
Re: [Repeater-Builder] Intermod Calculation
I've had luck finding these kinds of problems by bringing a spectrum analyzer to the site and connecting it to an antenna. I look at 10-20Mhz sections of the spectrum and try to find a spike that comes up at the same time as the interference. It is time consuming and dependent upon the interference happening frequently, but it works quite well. It beats sitting around trying to analyze the problem to death and you feel like you're at least doing something. Sometimes you need to prove where the trouble is not happening help you focus on where it really is. 73, Joe, K1ike On 8/20/2010 6:35 PM, Tim Sawyer wrote: I have paging intermod from 157.740 Mhz.
Re: [Repeater-Builder] Polyphaser Question
I don't think that you have necessarily wasted your time, but you have severely limited your chances of decreasing lightning damage. It's like replacing 3 tires on your car that has 4 bad tires, you've bettered your odds but it is not the best fix. I have a site that the owner would throw me off if I started installing single;e point grounding and all kinds of wiring. I use a grounded Polyphasor in hopes that it will decrease my odds of lightning damage. Yes, the purist will say that this is wrong, but it's not my site and I'm a guest. That's the deal and I accept it. It's a case of something is better than nothing. 73, Joe, K1ike On 8/17/2010 10:42 PM, Chuck Kelsey wrote: Leave one unprotected path available and you've wasted your time. Chuck WB2EDV
Re: [Repeater-Builder] Polyphaser Question
Better than a fraction of a percent protection. I've lost a couple of polyphasors in the years, but never had lightning damage. I'm a realist, everything isn't perfect all of the time. 73, Joe, K1ike On 8/18/2010 9:04 AM, Chuck Kelsey wrote: OK, yes, you have severely limited your chances of being protected. I'd hazard a guess that it would be a fraction of a percent better than having no protection at all. Your condom has a hole in it ;-) Chuck WB2EDV - Original Message - From: Joek1ike_m...@snet.net To:Repeater-Builder@yahoogroups.com Sent: Wednesday, August 18, 2010 8:34 AM Subject: Re: [Repeater-Builder] Polyphaser Question I don't think that you have necessarily wasted your time, but you have severely limited your chances of decreasing lightning damage. It's like replacing 3 tires on your car that has 4 bad tires, you've bettered your odds but it is not the best fix. I have a site that the owner would throw me off if I started installing single;e point grounding and all kinds of wiring. I use a grounded Polyphasor in hopes that it will decrease my odds of lightning damage. Yes, the purist will say that this is wrong, but it's not my site and I'm a guest. That's the deal and I accept it. It's a case of something is better than nothing. 73, Joe, K1ike On 8/17/2010 10:42 PM, Chuck Kelsey wrote: Leave one unprotected path available and you've wasted your time. Chuck WB2EDV Yahoo! Groups Links
Re: [Repeater-Builder] Coax length, etc.
I don't know about that. Anritsu SiteMaster and CellMaster test sets are fairly common test equipment available to cell techs here in Connecticut. Whether they use them (or know how) is another thing. Joe On 8/15/2010 2:59 AM, Nate Duehr wrote: What's up with the RF industry not buying these things by the truckload? Too spendy?
Re: [Repeater-Builder] Coax length, etc.
On 8/14/2010 8:44 AM, Jeff DePolo wrote: But if the duplexer is tuned to 50 ohms, and the cable is 50 ohms, varying the cable length isn't going to change the Z seen by the transmitter. Or are you suggesting the duplexer is purposely de-tuned from 50 ohms? I use a Network Analyzer to tune duplexers. Although I can usually get an impedance of 50 ohms, many times the L or C reactance is not perfect. Maybe the transmitter is responding more to the reactance mismatch rather than the impedance mismatch. This area of RF black magic very quickly gets me lost in the ether. 73, Joe, k1ike
Re: [Repeater-Builder] Pager interference
Hello Dwayne, I wonder if the paging company has made a change. Did they used to have two separate transmitters, now only have one that switches frequencies? This has been happening at sites since the pager population is dwindling. Paging companies are taking advantage of the multi-frequency capabilities of their transmitters and, for example, putting all their frequencies in one transmitter. They then eliminate the other transmitters to save rent. This is a cost effective thing for them to do. They need to page on all their frequencies because they have pagers out there on different channels and they don't want to replace individual pagers. If this is the case at your site, here is the downside for you. Because one transmitter is doing many frequencies, they have to eliminate any filter cavities they may have had on each individual transmitter. A site can change from no paging interference to tremendous interference overnight. If the original contract for the paging company required filters (some did) or had a non-interfering clause you may have some recourse. If you are a ham freebee like some of my repeaters are, you may just have to live with it. The real fix is probably going to be on the paging transmitter. 73, Joe, K1ike - Original Message - *From:* Dwayne mailto:ldgya...@ldgelectronics.com *To:* Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com *Sent:* Saturday, August 07, 2010 1:38 PM *Subject:* [Repeater-Builder] Pager interference Hi, I've got a new pager issue that has come up on a tower where we have a VHF repeater. It's about 400 watts erp and 15 feet horizontal distance and 4.3 and 4.7 MHz away (it switches). Your email settings: Individual Email|Traditional Change settings via the Web http://groups.yahoo.com/group/Repeater-Builder/join;_ylc=X3oDMTJlNHFkbjJqBF9TAzk3NDc2NTkwBGdycElkAzEwNDE2OARncnBzcElkAzE3MDUwNjMxMDgEc2VjA2Z0cgRzbGsDc3RuZ3MEc3RpbWUDMTI4MTIxNTI0NA-- (Yahoo! ID required) Change settings via email: Switch delivery to Daily Digest mailto:repeater-builder-dig...@yahoogroups.com?subject=email%20delivery:%20Digest | Switch to Fully Featured mailto:repeater-builder-fullfeatu...@yahoogroups.com?subject=change%20delivery%20format:%20Fully%20Featured Visit Your Group http://groups.yahoo.com/group/Repeater-Builder;_ylc=X3oDMTJjcDd1azJhBF9TAzk3NDc2NTkwBGdycElkAzEwNDE2OARncnBzcElkAzE3MDUwNjMxMDgEc2VjA2Z0cgRzbGsDaHBmBHN0aW1lAzEyODEyMTUyNDQ- | Yahoo! Groups Terms of Use http://docs.yahoo.com/info/terms/ | Unsubscribe mailto:repeater-builder-unsubscr...@yahoogroups.com?subject=unsubscribe
Re: [Repeater-Builder] Re: Mastr II drift problem
Sometimes troubles like this are hard to find because you can't be there when it is happening. I have found that a Radio Shack Digital Voltmeter that I have and an old laptop have been handy for such times. I bought an RS DVM with the RS-232 interface on sale a few years ago. I connected it to an old laptop that I have via the RS-232 port and run the simple program that came with the DVM. It records readings over time and stores them to a file. You can then look at the file and see if things have changed over a period of time. I've used it to record AC voltage at sites where I suspected drops in voltage levels and it was helpful to get things fixed. Definitely not lab quality equipment, but very helpful in troubleshooting. This setup could easily watch the 10 volt line or the compensation voltage line. Just thought I'd pass this idea along. 73, Joe, K1ike On 8/4/2010 8:11 AM, steve wrote: I am using a PLL exciter with a 5C Icom. I am going to check the 10 volt supply. I have a couple of 10 volt cards that I will swap out if needed. Thank you Steve
Re: [Repeater-Builder] Re: Mastr II drift problem
Radio Shack Cat No 22-812, I don't know if they even sell them anymore. Joe On 8/4/2010 9:50 AM, wd8chl wrote: Really??? What's the model of that DMM? We could use that here! Jim
[Repeater-Builder] Re: Simrex - GLB Pre-Selector Pre-Amplifier
It looks like Skipp and I have found that the GLB preselector has been successful at helping less then ideal repeaters work better. I can think of two examples that I have had. I had a Midland 13-509 repeater back in the late 80's on 223.72MHz. It used a set of homebrew copper pipe duplexers. The duplexers would drift with temperature swings, but by adding a GLB preselector I was able to add enough additional rejection to make the repeater play quite nicely. I also had a UHF Maggiore repeater that used an antenna at 450 feet on the top of a tower. I was being plagued by occasional desense that I was never able to track down. It never seemed to happen when I was at the site. By adding the GLB preselector I was able to reject whatever it was that was getting past the duplexers and solve the problem. My point is that the GLB is not just something to add to a repeater to make it have a hotter receiver. The BIG advantage is that you can get a bandpass characteristic with very tight skirts that will help a receiver that is passing too much crap through it's front end. You can also get this in a very small package that will fit in an area where you don't have room to hang a big cavity filter on the wall. The GLB is not the answer for everybody, but it has it's place. 73, Joe, K1ike
Re: [Repeater-Builder] Re: Simrex - GLB Pre-Selector Pre-Amplifier
Hello Bob, I agree that the GLB is a space saving device, but don't you think that the multistage helical coil stages in the preselector with beat a single cavity in skirts and out-of-band rejection? Joe On 7/31/2010 9:30 AM, n...@no6b.com wrote: A 1/4 wave bottle will provide much more rejection ahead of that first amp, and with less loss hence lower NF. IMO the Simrex amplified preselector is a space-saving compromise, nothing more. Bob NO6B
[Repeater-Builder] Intermod study for a site with spread spectrum equipment located on it
Does anyone know who would do an Intermod study for a site that has 900MHZ spread spectrum on it? I have done some very basic intermod runs, but don't quite know how to handle spread spectrum nor who to refer to for this service. Any ideas? Thanks, Joe, K1ike
[Repeater-Builder] Adjusting low power on an R1225 repeater
Hello to All, I want to turn the power down on my Motorola R1225 repeater to about 5 watts. It is the high power UHF version (25-45 watts). The reason for the low power is to drive a power amp at the output I want to achieve. Any drawbacks to running the R1225 this low? 73, Joe, K1ike
Re: [Repeater-Builder] Adjusting low power on an R1225 repeater
Thanks Eric, I though there was a caveat to turning it down, but couldn't remember why. I want to experiment with an EchoLink repeater, but I'm not sure that the R1225 UHF hi power could hold up at 25 watts continuous duty. I think I'll do some shopping as you suggest. 73 and Thanks, Joe On 7/29/2010 10:01 PM, Eric Lemmon wrote: Joe, Yes, indeed! The UHF high-power version will likely either go spurious or burn up if set that low. The only way to go with the radio you have is to add a 6 or 10 dB power attenuator rated at no less than 25 watts, and set your TX power at the low end. Admittedly, this is a kluge of the first degree, but hey- you asked! Otherwise, try to get your hands on one of the 1-to-10 watt R1225 units, and you can have a ball. I suppose you could modify your high-power R1225 into the low-power version, but that is a lot of work, and the opportunities for permanently damaging the mainboard are legion. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Joe Sent: Thursday, July 29, 2010 6:45 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Adjusting low power on an R1225 repeater Hello to All, I want to turn the power down on my Motorola R1225 repeater to about 5 watts. It is the high power UHF version (25-45 watts). The reason for the low power is to drive a power amp at the output I want to achieve. Any drawbacks to running the R1225 this low? 73, Joe, K1ike
Re: [Repeater-Builder] Re: Base station coax connector weatherproofing recommendations?
On 7/28/2010 1:11 PM, skipp025 wrote: I lay down a base wrap of decent quality tape before applying the Scotch 130c because I do work for (other) people who very often change their mind. Ah, the famous courtesy wrap as it's known out here in the East! 73, Joe, K1ike
Re: [Repeater-Builder] Re: Service monitor newbie questions, Determining RX sensitivity with HP 8924C at 12db sinad
I'm not aware of any training for the IFR products, but I did just download an Application Notes for the IFR1500 to: http://groups.yahoo.com/group/Repeater-Builder/files/IFR1500%20Application%20Notes/ Many of the applications for the IFR1500 will be similar to the IFR1200S 73, Joe, K1ike On 7/27/2010 12:25 PM, Tommy Dow wrote: Hi, I recently aquired an IFR 1200S and was wondering if similiar training info exists for this machine like the HP? Tom
Re: [Repeater-Builder] Re: Duplxer, tuned cavity question.
My really rough guess is that you will need around 85dB of isolation between the two stations. Using two antennas 25 feet apart is only going to give you about 30dB of isolation. A bandpass filter at .64Mhz off the center frequency will only give you around 10-20 dB more of isolation. I think you will need either a bandpass/bandreject filter, or possibly a notch filter on each station. My math is all best-guess, so please verify it before you go buying equipment. I use a TX/RX Vari Notch 10 cavity for a similar application, but they are expensive. I don't think you sare going to find a cheap fix. Someone with more math skills can possibly verify my guess. 73, Joe, K1ike On 7/22/2010 7:10 AM, Kc7hgn wrote: I am not going to be able to stack the antennas. They Would be about 25-40 feet apart horizantal. I guess what I need is 2 bandpass filters. I think thats what I am looking for. Now the big question. Can I build them? And where would I find the information? If I can't build them, where would be an inexspensive place to buy them? I don't know of any Elmers in my area that know about bandpass filters, or one that would take the time to help. Thats why I am here. Thanks, Kevin Kc7hgn
Re: [Repeater-Builder] Re: Duplxer, tuned cavity question.
If you are going to have two separate antennas you will not need a duplexer. Will the antennas be side-by-side or stacked one above the other? Stacking them will give you vertical separation that will help to eliminate interference. You will probably still need some bandpass/bandreject filters, basically a duplexer split in half. Joe On 7/20/2010 5:59 AM, Kc7hgn wrote: Well they don't have to be on the same antenna. But each one would be about 25 feet from each other. Both Copper J-Pole antennas. I guess I would still need to buy a duplexer. Could I build one? Will be 50w on 1 antenna and 25 on the other. I don't know much about this stuff. Thanks, Kevin Kc7hgn --- In Repeater-Builder@yahoogroups.com, Joek1ike_m...@... wrote: .
Re: [Repeater-Builder] Duplxer, tuned cavity question.
Good advice. The only thing that I would add is that you need to use good quality equipment for the antenna system. This includes the duplexer, jumpers, connectors, cable and antenna. When you have a situation where two transmitters can be on the air at the same time on the same antenna system, you always stand the chance of creating intermod. 73, Joe, K1ike On 7/19/2010 6:55 AM, Milt wrote: Assuming from reading between the lines that you want to use both stations on the same antenna, get a 2 meter duplexer. The seperation between the 2 frequencies is 0.64 MHz. At bare minimum you need a notch (reject) duplexer but a bandpass-band reject type would probably be the better choice. Tune each leg to the respective frequency and connect to the respective radio. Milt N3LTQ - Original Message - From: Kc7hgnkc7...@yahoo.com To:Repeater-Builder@yahoogroups.com Sent: Monday, July 19, 2010 5:48 AM Subject: [Repeater-Builder] Duplxer, tuned cavity question. I have an APRS station on 144.39. I would also like to run my Packet station on 145.03. So I need someway to run both stations. What would I need to do? Can I build what I would need? If so where would I find that info? Thanks, Kevin Kc7hgn Yahoo! Groups Links
Re: [Repeater-Builder] Controller recommendations
S-Com can be a love/hate relationship. The older models did not have an RS-232 interface, so you needed to keep track of everything religiously on paper. BUT, they seemed to last forever. I have a few of them and they have never glitched..never. The newer S-Com controller has all the bells and whistles, including the computer interface. 73, Joe, K1ike On 7/19/2010 9:32 AM, wd8chl wrote: Didn't see anybody mention S-Com! http://www.scomcontrollers.com/ It'll do what you want, and they just run...and run...and run...
Re: [Repeater-Builder] Re: Controller recommendations
But does it allow you to read what is programmed in the controller? Joe On 7/19/2010 1:16 PM, skipp025 wrote: There is/was Windows Programming Software for all the early S-Comm Controllers. Yes it used DTMF Control over the and/or over a phone line. Once you wrote the simple text scripts to program the controller the upload was fairly painless.
Re: [Repeater-Builder] Controller recommendations
The ability to program over-the-air, via phone line, or through the optional RS-232 port was one of the big advantages of the ACC controllers in the 1980's. This was a controller that was way in front of the curve, but the cost was prohibitive for the average ham. 73, Joe, K1ike On 7/19/2010 12:30 PM, wd8chl wrote: heh-RS-232 on a ham controller was a pretty rare bird no matter what...only a few had it...til abt 7-8 years ago or so...
Re: [Repeater-Builder] Re: Controller recommendations
But that is specific to the 7K controller. I have the 6K and 5K versions. To my knowledge, they cannot be downloaded. Joe On 7/19/2010 2:01 PM, skipp025 wrote: Joek1ike_m...@... wrote: But does it allow you to read what is programmed in the controller? Joe Sure, I can download an entire image of the controller programming and save it. Then reprogram those contents back to the same or a different controller. Handy since I easily have 10 plus 7K Controllers (with DAB Boards) in service. S. On 7/19/2010 1:16 PM, skipp025 wrote: There is/was Windows Programming Software for all the early S-Comm Controllers. Yes it used DTMF Control over the and/or over a phone line. Once you wrote the simple text scripts to program the controller the upload was fairly painless. Yahoo! Groups Links
Re: [Repeater-Builder] question for commercial radio shops
I had a similar experience with a low power FM transmitter that a church put on the air. I started to get interference on my 6 meter repeater. It turned out that the local church moved their FM station to the tower that I am on and put their antenna on the top of the 300 foot tower 5 feet away from my 6 meter antenna. They never modified their license for the new location and were way over the height on the tower that they were licensed for. The problem was that I was running an ARR preamp that worked fine until the FM station caused overload. They ignored all that I warned them about and I ended up taking the preamp off. (I'm a guest on the tower and I'm not about to complain to the owner). Anyway, they are running more power then they are licensed for, too high on the tower for a low power lFM license, and never got licensed for the new location. All this for spreading the word of the Lord. They mean well, but seems ironic to me. 73, Joe, K1ike On 7/14/2010 10:46 PM, n5sx...@charter.net wrote: I would not do it. Explain that it is illegal, and could get him into serious trouble. And when he tries to hang the BUt its for a CHURCH CAMP guilt trip on you, remind him that Jesus told us to render to Cesar that which is Cesar's and unto the Lord that which is the Lord's.
Re: [Repeater-Builder] Alternative To Hamtronics PCBs?
Ramsey used to make some kits, but the quality was not that good. Even the Hamtronics parts are of questionable quality. The only advantage to Hamtronics (I've had a couple) is that you get the satisfaction of building a kit and seeing it (hopefully) work. There is so much surplus quality commercial equipment out there that is far superior to any of the kits in performance and reliability. When narrow banding finally is a requirement after the January 1, 2013 deadline there should be a glut of quality wide band FM radio equipment available. In the most recent issue of MissionCritical magazine Midland has an advertisement for trade-ins that says the following: All radios received for trade-in will be donated to Amateur Radio Organizations across the US helping to build the world's largest emergency response network. We'll see what happens. 73, Joe, K1ike On 7/9/2010 8:11 AM, vk4jrc wrote: I have ordered some Hamtronics UHF Tx Rx PCBs to use for building a repeater. Are there any other suppliers who make a similar product that I could buy and make a comparison for performance? Or, should I just stick with the Hamtronics boards, alone? Cheers, Jack. VK4JRC
Re: [Repeater-Builder] MASTR II LOW BAND TUNING
I was just quoting the sales flyer. I agree that the bandpass curve has the typical knee shaped bandpass curve instead of the bell shaped curve for what I would call a bandpass duplexer. The only real application that I can see for these duplexers would be a mobile installation that is operating in the full-duplex mode. It's interesting that they picked 52 and 53MHz on the plot, maybe they were targeting the ham market? 73, Joe, K1ike On 7/5/2010 8:02 PM, Eric Lemmon wrote: I see what the sales flyer says, but the response plots show no real bandpass action.
Re: [Repeater-Builder] MASTR II LOW BAND TUNING
The spec sheet shows them to be bandpass/band reject. From the document: These duplexers utilize six high Q (helical) resonant cavities, interconnected in a band pass-band reject configuration which allows close spaced transmit-to-receive frequency operation. Joe On 7/5/2010 6:33 PM, Chris Curtis wrote: They are notch only devices and I've used similar devices using that helical design for years.
Re: [Repeater-Builder] Inline coax connector style impedance matcher
Maybe you were thinking of a Coaxial Line Stretcher? Look at: http://www.hirose.co.jp/cataloge_hp/e35500029.pdf These keep a constant impedance of 50 ohms, but allow you to adjust the length of the cable. 73, Joe, K1ike
Re: [Repeater-Builder] Inline coax connector style impedance matcher
(I'm resending this message. Somehow the wayback machine took my computer back to June 3rd.) Maybe you were thinking of a Coaxial Line Stretcher? Look at: http://www.hirose.co.jp/cataloge_hp/e35500029.pdf These keep a constant impedance of 50 ohms, but allow you to adjust the length of the cable. 73, Joe, K1ike
[Repeater-Builder] Death of a Service Monitor
Worth watching if a service monitor ever caused you frustration. http://www.youtube.com/watch?v=3nXbBS3lVXU 73, Joe, k1ike
Re: [Repeater-Builder] Recording of mysterious noise
It sounds like the squelch closes on your receiver when the signal drops, is that correct? If so, that would eliminate the possibility of the noise being the output of a repeater that has a tail timer. Can you detect any tail timer at all? If I were to make a guess, it sounds like a transmitter that is keying up with noise, such as an RF link for something, and noise on the link input is keying up the transmitter. Are you able to detect any PL tone in the noise that you hear? PL may give you a clue as to the source of the signal. Can you DF the signal? Is this in the ham band, or commercial freq? Does it happen more at certain times of the day? Is it weather related? A trick that I used was to set up a spectrum analyzer and watch 10-20Mhz at a time. I would listen to the noise and look for another signal that keys up at the same time. Very time consuming, but can be very effective. It's a crap shoot, but it beats just sitting and listening to the noise. Some ham rigs even offer a crude spectrum analyzer mode, such as my Yaesu VX7-R HT. I've used the VX7-R to look for signals with some success. (I had to read the manual to get the darn think out of the SA mode!) I used to do a lot of tracking down of interference. It helps to analyze what is not causing the noise and don't always focus on what you think it is. Eliminating what is not causing the interference many times helps you focus in on what is really causing it. Good luck and 73, Joe, K1ike On 6/29/2010 4:15 AM, gm7svk wrote: Hello, Loaded sample to files section. Has anyone encountered this sort of noise on a system or have a suggestion as to what might be generating it? Proving difficult to determine source. Thank you, Doug - GM7SVK
Re: [Repeater-Builder] Aerotron Power Supply
Hi Larry, According to the book, the 1093 provides the following DC outputs: Unregulated 18 VDC at 1.5Amps Regulated 12.5 VDC at 25 Amps (28 Amps intermittent)* Regulated 12.5 VDC at 1.5 amps* Regulated 9.5 VDC at 1.5 Amps Regulated 9.5 VDC at .05 Amps* *These outputs are activated by grounding the PTT input Duty cycle is listed as continuous 12.5 VDC is adjustable from 11VDC to 14 VDC 9.5 VDC is adjustable from 8 to 11 VDC 73, Joe, K1ike On 6/20/2010 9:48 PM, Larry Watkinson wrote: Can anyone tell me how many amps this power supply is: Model Number 1093 It had powered a UHF repeater that was in a cabinet, I do think at one time there may have been a AMP in the rack, but do not know that for a fact. Larry KC7CKO Olympia, WA
Re: [Repeater-Builder] Re: Vertical squalo as 6m repeater antenna?
I prefer the ground plane for my 6 meter repeater. Look at these two links: http://www.repeater-builder.com/db/pdfs/db-201.pdf and http://www.repeater-builder.com/db/pdfs/db-201.pdf They are rather simple antennas, very durable and last a long time. I have one at 30+ feet now for several years and never had a problem so far. It's at the top of the tower and the folded vertical element makes it a grounded element antenna, important for lightning damage avoidance. I also believe it is a little quieter relative to wind noise. A single antenna mounted out on the far edge of the platform should work. If it is a monopole tower, you would probably want to mount the antenna so that the less favored direction is towards the mass of the tower. Joe On 6/9/2010 9:28 AM, cruizzer77 wrote: Hi Joe We have access to 3 platforms of that tower and the total height of all our antennas on all platforms must not exceed 5 meters. As far as I could find out if 2 or 4 coupled antennas would be mounted on the same level around the tower they would probably count as one system with the height of one of them. On the level where the 6m antenna(s) should be mounted there's almost nothing yet and afaik there's no problem with the distance from other antennas above, that should be more than enough. This tower has a lot of potential and to not restrict other club projects I can not claim more than about one meter out of the 5 for the 6m repeater antenna(s)... Martin Yahoo! Groups Links
Re: [Repeater-Builder] Vertical squalo as 6m repeater antenna?
It would be if you wanted a horizontally polarized repeater system. The Squalo is an SSB/CW antenna made for horizontal polarization. Joe On 6/9/2010 9:33 AM, Lee Pennington wrote: I agree with Joe, but I believe if mounted as designed, the performance, while not earth shaking, will be much better than a mobile antenna with radials. de Lee K4LJP
Re: [Repeater-Builder] Icom rp1510
Henry, I have an RP-3010 that someone reprogrammed the callsign for me. That was back in 1999, he may still be around and willing to program your EPROM possibly for a small fee. Email me direct and I'll see if he is interested, if his email address is still good. The original ICOM controller is very, very simplistic and does some annoying things. I would not waste my time reprogramming it. There are some inexpensive controllers out there that would run circles around the stock ICOM controller. 73, Joe, K1ike On 6/9/2010 12:43 PM, k4...@charter.net wrote: A friend brought over an Icom rp-1510 that he had bought and wanted to change the cwid call. It looks like the call may be contained in the 27256 EPROM. Since the EPROM was in a socket, so I unplugged it and read the data. I could see nothing that looked like a callsign, so I suspect it is probably binary. Does anyone have any info on re-programming the callsign? I can burn the EPROM but need to know how the data is arranged. Thanks Henry
Re: [Repeater-Builder] Icom rp1510
I just tried to email the gentleman, but the address turned up to be bad. All I remember is that his name was Pete. (Pete, are you on this list?) I'll try to find the envelope that he sent me the EPROM in, if I still have it. 73, Joe, K1ike On 6/10/2010 11:27 AM, larryjspamme...@teleport.com wrote: Please post it here on the list, too, if you find a source for programming the ICOM ID'er. LJ -Original Message- From: Joe Sent: Jun 10, 2010 10:56 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Icom rp1510 Henry, I have an RP-3010 that someone reprogrammed the callsign for me. That was back in 1999, he may still be around and willing to program your EPROM possibly for a small fee. Email me direct and I'll see if he is interested, if his email address is still good. The original ICOM controller is very, very simplistic and does some annoying things. I would not waste my time reprogramming it. There are some inexpensive controllers out there that would run circles around the stock ICOM controller. 73, Joe, K1ike On 6/9/2010 12:43 PM, k4...@charter.net mailto:k4hal%40charter.net wrote: A friend brought over an Icom rp-1510 that he had bought and wanted to change the cwid call. It looks like the call may be contained in the 27256 EPROM. Since the EPROM was in a socket, so I unplugged it and read the data. I could see nothing that looked like a callsign, so I suspect it is probably binary. Does anyone have any info on re-programming the callsign? I can burn the EPROM but need to know how the data is arranged. Thanks Henry
Re: [Repeater-Builder] Vertical squalo as 6m repeater antenna?
Mounting the Squalo vertically will probably give you some sort of wierd directional pattern, not good for a repeater. I would opt for a ground plane or base loaded mobile whip mounted over a set of 3 or 4 1/4 wave ground radials. What is your height restriction? How for are you from metal above and below the place you want to mount the antenna? For example, if your going to be very close to an antenna just above your 6 meter antenna there may be a lot of interaction. 73, Joe, K1ike On 6/9/2010 6:50 AM, cruizzer77 wrote: Can anybody tell me something about squalos for repeater usage?
Re: [Repeater-Builder] active low COR
I prefer active high for just the reason that you described. I usually fuse my equipment individually, so a blown fuse in the receiver can cause an active low to be sent to the controller, thereby keying the transmitter. If I do use active low, I put a pull-up resistor in the controller and test it see if it keeps the COR high on a receiver power failure. Joe On 6/3/2010 4:55 AM, scott w wrote: Hello to group, What is the advantage of an active low COR. Most I have talked to say they have their controllers set that way, so I set mine that way,plus the Maxtrac I am using as a receiver default is active low. I simulated a power failure to the reciever and the line went low and the transmitter thought it was time to transmit. I also accidently pulled the cord from the controller off the back of the receiver and again a low status and the transmitter thought it was time to transmit. Im not seeing a benefit of a active low COR in those repects. Should I go to active high or since those things dont usually happen often leave it LOW.. Any advice or ideas appreciated.. 73s
Re: [Repeater-Builder] Commercial VHF antenna on 2m
Hello Dave, You may be able to improve the VSWR match, but the antenna may still not perform well. What kind of an antenna is it? If it is the typical fiberglass collinear antenna, the internal elements will be too short. Using a 154MHz antenna on 146.745MHz will mean that the elements will be about 5% too short. It is my understanding that when you shorten the elements on a collinear array by 2% you will get about a 3% down-tilt off the horizon of the antenna angle of radiation. Your antenna (if it is a collinear) will have quite a serious down-tilt with the 5% shorter elements. This may not be bad on a very high site covering very low terrain around it, or if you are trying to keep the signal from propagating much farther from the horizon. If the terrain that you are trying to cover is not much lower than the repeater site elevation you may have a coverage issue. Look At: www.ad4c.us/Antennas/collinearantenna.doc and look at his comments about down-tilt. 73, Joe, K1ike = On 5/9/2010 12:13 AM, WA3GIN wrote: Hi folks, Several weeks ago I posed the question of using a Commercial VHF antenna that was resonant on 154Mhz on 146.745Mhz. We tried it today. The SWR was a bit over 2:1 on the repeater freq. We installed a T connector after the cans and used an open stub to try to match the line...got it down to 1.5:1, wouldn't go any lower. We think the height of the antenna makes up for what we suspect is a lot of loss in the antenna. The previous location of the repeater antenna was 100ft ASL and this location is 525ft ASL. Maybe one day we'll get a chance to retune the four dipole antenna. Thanks to all that provided ideas for this project. 73, dave wa3gin
Re: [Repeater-Builder] Re: Strange Signal on 158.275(ish)
I think the illegal porn was giving them headaches. They just banned storing them on their web site. Joe On 5/3/2010 12:13 PM, La Rue Communications wrote: Its all about the storage capacity. People have, in the past, abused the site for GB of storage. Its probably why Yahoo disallowed that option. (Also makes it dial-up friendly)
[Repeater-Builder] Another neat kit for repeaters
I found this interesting device while browsing over the http://www.electronickits.com web site: http://www.electronickits.com/kit/complete/ligh/vemk160.htm I was looking for a way to turn a portable repeater on/off remotely when I was out of the RF coverage area. This scheme uses a cellphone with a simple photo cell to detect when the screen lights up during ringing. For about 20 bucks and a cheap prepay phone I can control the repeater from anywhere I have cell phone coverage. Interesting 73, Joe, K1ike
Re: [Repeater-Builder] Re: Another neat kit for repeaters
On 5/2/2010 12:57 PM, skipp025 wrote: I'm almost laughing out loud while thinking about all the wrong numbers and undesired telemarketer calls shutting down the repeater mid sentence. s. Nope, you can use a 2 call sequence to avoid this according to the docs. Joe
[Repeater-Builder] CAD program for documenting antennas on towers
Does anyone know of a program specifically for towers to do drawings? Not just a CAD program, but something designed specifically for towers. Free or paid is OK. Just thought I'd take a long-shot that something may be out there. 73, Joe, K1ike
Re: [Repeater-Builder] CAD program for documenting antennas on towers
I used Visio when I worked for Sprint/Nextel to document the floor plans in the shelters. Things were pre-built and you just placed them on the drawing. I hated it and did everything to get out of doing the task. Joe On 4/28/2010 12:24 PM, Eric Lowell wrote: I worked for a paging company years ago, and we used Visio to diagram the towers for MPE (maximum permissible exposure) compliance work. Visio is not specific to tower drawing, and I found it non-intuitive to use. Having said all that, It did the job. Eric Lowell Eastern Maine Electronics Inc. 48 Loon Road Wesley ME 04686 eme@starband.net www.satnetmaine.com 207-210-7469 *From:* Joe k1ike_m...@snet.net *To:* Repeater-Builder@yahoogroups.com *Sent:* Wed, April 28, 2010 10:20:09 AM *Subject:* [Repeater-Builder] CAD program for documenting antennas on towers Does anyone know of a program specifically for towers to do drawings? Not just a CAD program, but something designed specifically for towers. Free or paid is OK. Just thought I'd take a long-shot that something may be out there. 73, Joe, K1ike
Re: [Repeater-Builder] COR signal from ICOM 37a
As someone else suggested, you can probably pick a signal off the BUSY LED. I had a couple of these years ago and I remember that the transmit audio was kind of crappy. tinny sounding. I did a mod to help the mike audio, but it never sounded really good. This may be a drawback in using it for linking. You may have to play with the input audio to make it sound reasonably good. 73, Joe, K1ike On 4/27/2010 12:07 AM, Robert McNeill wrote: I want to link two repeaters together and have a couple of Icom 37a 220 rigs on the shelf. I have been searching for info on the best place to grab a signal to drive a COR. Does anyone have any info on this? Thanks!! 73 K5ILS Robert
Re: [Repeater-Builder] AC buzz on VHF
I had a similar problem at my house and it was tearing up my packet digipeater. It turned out to be microspark interference. See this message: http://www.mail-archive.com/repeater-builder@yahoogroups.com/msg50828.html It turned out to be a tie-wire that is used to hold the wire into the insulator on the high voltage line in front of my house. The tie wire was just long enough to resonate in the 2 meter VHF band, but very little noise was being created on the AM broadcast band. Do the test that I described in the above message and see if it is AC power line interference. If it is, you should ride around the general area of the tower and listen on your car AM radio. When you get very close to it, you should hear the interference on both the VHF and Am radio. If you have a handheld scanner that receives AM it will be easier to find the interference. 73, Joe, K1ike On 4/26/2010 10:23 AM, kc0mlt wrote: Hello all, I am in the process of putting up a 2M repeater on what I would consider a pretty vacant site. There is only one other machine (70cm Repeater) currently out there. My concern is with an AC (60Hz) buzz that comes across on the VHF band. It doesn't have a signal to it that will key uip a radio, but when you receive an actuall signal you can here it. We have heard this on both handhelds and mobiles. This site is unique as it is a duel tower with old (unused)Microwave panels and drums on the bridge at the top of the two towers. The microwave equipment is no longer hooked up. We have had the power company totally unhook the power to the site and the buzz was still present. The nearest high voltage lines are about 1.5 to 2 miles away. You can not hear the buzz on any AM reciever. Does anybody have a clue as to what this could be and what we could to do prevent it? We have some thoughts on the grounding of the guy wire being a cause but we are unsure of that. Any ideas would be greatly appreciated! Thanks Wade KC0MLT Yahoo! Groups Links
Re: [Repeater-Builder] Interference from local 600 kHz radio station.
There was a 6 meter repeater here in Connecticut that was receiving interference from an AM station several states away that was broadcasting on 1000KHz. It only occurred in the nighttime. (The 6 meter repeater was on a 1MHz split). They narrowed it down to something on the 21+ towers that are on the site, but never found it to my knowledge. It could have been a piece of loose hardware, rusty joint, bad antenna, etc. If I remember correctly, rain made it go away. This can be a real bugger of a problem to find. I would look at guy wires or anything that is long enough to pick up enough signal from your 600KHz station. Does it happen when it rains? 73, Joe, K1ike On 4/25/2010 11:06 PM, lpcoates wrote: Hi We have a local AM radio station on 600 kHz. Their transmitter site is about 10 miles from the center of the city. From what I've found on the web, they run 25,000 watts during the day and 8,000 watts at night. On at least one of our repeaters we're finding that this is mixing with the output of repeater to create a phantom signal exactly on the input. We're not sure whether the mixing is happening inside the repeater or in something in the environment near the repeater. We've confirmed this is the source of the problem on one repeter and supect it on another. Has anyone had experince with a loacl AM station on 600 kHz? We're looking for way to combat the interference. Thanks Bruce - VE5BNC
Re: [Repeater-Builder] Re: how far
The typical cell site is probably running a 10 watt amplifier with an ERP of about 100 watts. City sites probably a lot less power. Your in the high power paging transmitter class. Physical damage can be done in the nearby horizontal field of the antenna using this much power and antenna gain. Joe On 4/25/2010 3:13 PM, George wrote: what do you mean...a cell site in the city radiates much more times than my antenna, its on the same level and shoots directly in peoples houses...
Re: [Repeater-Builder] Re: how far
Your saying that you took a 90 watt amp and modified it to 450 watts? This does not sound believable... The amp you have is possibly a B band analog amp. 90 watts may have been used at the cell site to overcome the combining losses that are involved in putting multiple transmitters on a single cellular antenna. The ERP would probably have still been around 100 watts. You have to have a balance between the cell site transmit power and the cellphone transmit power to make the system work. The paging industry used ERP upwards to 2KW or more to talk to a pager, but that was usually a one-way transmission. Joe Joe On 4/25/2010 4:08 PM, George wrote: well this amplifier is rated 90 watts you can see it on e-bay just type powerwave in the search. it has error eliminating computer inside and no distortion what so ever. i have it modified and use it at 450 watts and i pushed it with two power supplys that can put more than 120 ampers at 24 volts. the antenna is rated at 500 watts... i wonder why woud they do that...just to put out 5 watts? .
Re: [Repeater-Builder] Re: how far
I think your original post said that your antenna would be about 30-40 feet off the ground. Unfortunately, power cannot make up for a low antenna very well. You would need to get your antenna above the surrounding structures and foliage to have an effective system. If your house is on a bald hill with nothing around it, your plan may work very well. If you are surrounded by buildings and trees it may not. The only thing would be to fire it up and see what happens. Just be careful. At the ERP antenna output levels that you are playing with and frequencies involved, things can get dangerous for human exposure. Joe On 4/25/2010 4:29 PM, George wrote: i'll give you the answer: i don't have commertial tower, that is why the high power at the antenna, that is why the high gain from the antenna for receiving, that is why the line is 7/8 heliax foam 30 feet long, that is why a siclair antenna amplifier between the duplexer and the msf5000, now, my car has a 45watt remote installed spectra, modified to use 150 watt C class amplifier and receiving antenna separated from the transmitting antenna, that is why i am using 4 watt MTS2000 all over the city and that is why i ask questions here how far and am i in the ball park with the range of my setup
Re: [Repeater-Builder] OT: AZDEN PCS-3000
I had one of these years ago, not an outstanding radio. I think the mike connector on this rig was a strange multi-pin arrangement, hard to find and work on. My advice is polish it up with WD-40 and put it on the trophy shelf. Joe On 4/21/2010 8:33 PM, La Rue Communications wrote: Anyone familiar with these units? I know the company went out of business and the parts are near impossible to find. Most of the google searches I hit end up in collector's trophy photo galleries. I think its a 2 Meter Mobile, but I wanted to pick your brains on these. :) Picture attached. Be brutally honest please! Thanks! John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 http://tinyurl.com/2dtngmn
[Repeater-Builder] question for Group on Mastr III
Hello everyone Would like to know for a report if there is such a item available. I need to know if there is a preamp for receive for a G.E. Mastr III vhf in ham band 146.xxx. This is part of a recommendation I need to submit and you guys know the answer a lot faster than me trying to find it . Thanks Joe Landers Ke4eue
Re: [Repeater-Builder] Identify Please
It's never enough to make a profit, and never cheap enough to have a ham pay for it. We certainly are a parsimonious group of people. ;-) 73, Joe, K1ike On 4/17/2010 11:39 PM, Mel Swanberg wrote: I probably could, but I never know what to charge for stuff like that. Mel - WA6JBD
Re: [Repeater-Builder] Re: Duplexer parts
I don't know if this was suggested, but you can buy a cap of larger value that physically fits the area and then remove a plate/stator or two to get the proper value. Removing a plate and/or stator is a trick from way back in ham time when people scrounged parts and made them work. 73, Joe, K1ike On 4/17/2010 12:56 AM, Gary Hoff wrote: I don't think I could make one. I've seen rotors and stators available you can assemble yourself but they are quite a bit larger and wouldn't fit in the box. I think I've found one that I can make work and ordered it. It's not exact, but it'll fit in the spot and should function OK. Thanks to all who responded to my query. There were a lot of good ideas and they are all appreciated. Gary - K7ney On 4/16/2010 9:58 PM, Barry wrote: If all else fails it should be simple to work out the requirements and make one requires some manual skill and patience though To: Repeater-Builder@yahoogroups.com From: k7ney...@q.com Date: Fri, 16 Apr 2010 06:49:25 -0600 Subject: Re: [Repeater-Builder] Re: Duplexer parts Thanks, I sent them an email and they said they haven't sold that capacitor in 25 years and all spec sheets, etc are all gone. Was worth a try though. I'll keep looking Gary On 4/15/2010 4:28 PM, ac6vj wrote: Gary, Try Viking Technologies LTD. at www.cardwellcondens http://www.cardwellcondenser.com they have a very large selection of Johnson, series 167 capacitors and will be able to give you the exact specifications on the broken one that you have. Gregory AC6VJ --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com, Gary Hoff k7ney...@... wrote: I already found that one, thanks anyway, the 167-205 is close but not enough plates, mine has 6 rotor and 6 stator. Physical size is right though, maybe this cap was made by Johnson also since the numbers are close. Gary On 4/15/2010 1:59 PM, DCFluX wrote: http://www.surplussales.com/Variables/ButterflyCapacitors/ButCap1.html http://www.surplussales.com/Variables/ButterflyCapacitors/ButCap1.html http://www.surplussales.com/Variables/ButterflyCapacitors/ButCap1.html http://www.surplussales.com/Variables/ButterflyCapacitors/ButCap1.html (CAV) 167-205-71 sounds close to it. On Thu, Apr 15, 2010 at 11:59 AM, Gary Hoff k7ney...@... mailto:k7ney123%40q.com wrote: I have an old Phelps Dodge VHF Duplexer that has a frozen air variable. The Duplexer is a part# 499-509 and covers 144-174. The air variable in question is stamped 167-202 and is split stator about 1 3/8 square. Anybody know where I might find a suitable replacement, I haven't had any luck where I've been looking. Gary K7NEY Yahoo! Groups Links Looking for a hot date? View photos of singles in your area! http://clk.atdmt.com/NMN/go/150855801/direct/01/
[Repeater-Builder] Looking for manual for Aerotron MPAC lowband repeater
This is the newer black faced units, not the tan ones. I have a manual for the older tan one, but some of the circuitry is different. 73, Joe, K1ike
Re: [Repeater-Builder] D-Star Was: Molotora Gontor
I would strongly remind them that they are purchasing a system that has only ONE and only ONE supplier/source. This may not fit some of the bid requirements that some government agencies require. Joe Kris Kirby wrote: On Fri, 2 Apr 2010, Scott Zimmerman wrote: Around here (Western PA) the governments bought Icom D-Star radios for RACES. I had no objection to that since those radios can be used in analog modes with analog repeaters. Now they are wanting to get D-Star repeaters for RACES and emergency use.
Re: [Repeater-Builder] Nice article on the Molotora Gontor
Excellent radio and specs! This should put GE, RCA, Aerotron, all all the other big names out of business. For once the Motorola bean counters got their act together and supported this great product. 73, Joe, k1ike Kevin Custer wrote: Bob Meister has written a nice article on the Molotora Gontor for RB. http://www.repeater-builder.com/molotora/gontor/gontor.html http://www.repeater-builder.com/molotora/gontor/gontor.html Thanks go out to Bob for his efforts! Kevin Custer Yahoo! Groups Links Yahoo! Groups Links
Re: [Repeater-Builder] Nice article on the Molotora Gontor
You'll be in line after me. I was even smarter and ordered mine February 29th. Joe On 4/1/2010 11:45 AM, DCFluX wrote: I pre-ordered one on March 32, hope its shipped soon.
Re: [Repeater-Builder] Nice article on the Molotora Gontor
We got a nibble, who wants to set the hook? On 4/1/2010 2:57 PM, Jed Barton wrote: what's the name of this radio guys
Re: [Repeater-Builder] Helix / Connectors
The use of aluminum cable seemed to became popular when the cost of copper was sky high. It became cost effective for some companies (according to the bean counters) to use aluminum. Supply of copper was beginning to become a problem, so some coax manufacturers were promoting aluminum as a viable substitute. Then the price of copper came down and aluminum was not such a bargain. Copper supplies went back up and copper coax was readily available. I believe that aluminum coax can be used effectively, but the chances of having it installed properly are slim. Cable crews are either not trained or experienced at aluminum coax installation, or they lack the proper tools to install the connectors. Yes, aluminum coax has been used successfully in the CATV business, but CATV does not have to deal with the relatively weak receive signals and high transmit powers that are used in two way systems. I'll take copper any day. As Jeff said, one site visit to fix a bad aluminum cable connector on the top of the tower and you've lost all that you saved plus more. Jope Jeff DePolo wrote: While the cost of the cable alone may be 15% mroe for copper versus aluminum, the total project cost variation is likely going to be only a few percent.
Re: [Repeater-Builder] 449 MHz Wind Profiler Radar?
I agree with Chuck, This is according to an EPA site: Prototypes: 404 MHZ (74 cm) profiler developed for the Wind Profiler Demonstration Network (WPDN) in 1988. 449 MHZ (67 cm) profiler operates at the approved frequency for UHF profilers and will eventually replace the 404 MHZ units. Joe Chuck Kelsey wrote: According to the NOAA site: The original network consisted of (31) 404 MHz profiler sites located in the central United States and one site in Alaska. Since January of 2000, there are (32) 404 MHz profilers in the central United States and three 449 MHz profilers in Alaska. The press release indicated that they would all move to 449 MHz. Chuck WB2EDV - Original Message - From: MCH m...@nb.net To: Repeater-Builder@yahoogroups.com Sent: Wednesday, March 31, 2010 8:13 PM Subject: Re: [Repeater-Builder] 449 MHz Wind Profiler Radar? No - I recall when this was mentioned being at 449 MHz about 10 years ago. Joe M.
Re: [Repeater-Builder] Helix / Connectors
The Andrew connectors came with a small tube of grease, presumably silicon, that was to be used only on the O rings. Some of the newer connectors seem to come with no grease. I don't remember having a hardline connector seize up, except if it had serious water contamination. In that case, the connectors were bad and they were cut off. I've never seen PTFE used on connectors. Joe wd8chl wrote: The only compound I see recommended on hardline connectors is PTFE lubricants to keep threads from seizing. They even discourage the silicon lubes as they tend to break down.
Re: [Repeater-Builder] if you have a commercial licenses check it on the fcc site
If you're job hunting in the wireless/RF job sector a GROL can be helpful on your resume. It adds another hit on your resume if someone happens to pick that phrase to search for. Some jobs that were established years ago still contain the phrase GROL in their job description or requirements. 1st Class may also appear too. When your dealing with a Human Resource department, sometimes the people searching for potential employees have no idea what they are looking for. They just go by what is written in the job description or job requirements. Headhunters are the same. I've had calls from agencies that don't have a clue what the job is about, or that Connecticut is really on the East coast. Joe
Re: [Repeater-Builder] if you have a commercial licenses check it on the fcc site
I finally found the link to the database, the FCC makes nothing easy. Here it is: http://wireless2.fcc.gov/UlsApp/UlsSearch/searchFrc.jsp;JSESSIONID_ULSSEARCH=tvF3LwnPwJvK9fNV5tTvYBFhHq63rMp7GHRY7yLR3QWF27W6hF00!-392727333!-1803037743 Only 152 characters to type, error free. Or use this: http://tinyurl.com/yzaby3r I'm in it, so I can now loose my paper copy worry free. 73, Joe, K1ike* * Fuggitaboutit wrote: many people dont realize that the fcc has never put your old grol (ie) on the new FCC data base that was started in the late 90s it seems that if you had a grol before 1998 or thereabouts ( the inception of the fcc online data base), then your license may not be in the database forget trying to get them to look up your paper license if you lose the paper license, you are out of luck and will have to retest you may be able to call them up and tell them your info from your copy these licenses are still classified as lifetime licenses check yours on line on their site just to make sure its in there you probably have checked the site for your amateur information don't be surprised if you think you have a valid commercial license and you discover there is no record of it on the fcc site
Re: [Repeater-Builder] Helix / Connectors
I don't think I would use any kind of compound on RF connectors. I went to the RFS aluminum CELLFLEX®Lite training and no compound was recommended. Now, I'm not a fan of aluminum cable, but if it's going to be used I would use only manufacturer recommended connectors, no compound, torque the connector properly (this does not mean white knuckle tight), and properly weatherseal the connection. Proper installation techniques need to be followed so as not to crush or kink the cable. Joe DCFluX wrote: The connectors should be fine, I wouldn't trust the aluminum feedline. You may want to try using an anti-oxidation compound, such as No-Ox or Aluminum Ox-Gard during assembly.
Re: [Repeater-Builder] Re: NOS GE Phoenix For Sale
Which mike are you looking for? I may have a NOS one somewhere, handheld with Whelen written on it. 73, Joe, K1ike MCH wrote: I think the 200 was 16 channels with an option for 32 channels. While I'm typing, does anyone have a source for a replacement Whelen microphone element? I can't justify $150 for one from Whelen. Even a source for a good used Whelen mic would be welcome. And sorry about the off-topic post relative to the subject. Please direct any replies to my email address rather than the list. Joe M.
[Repeater-Builder] Re: Now Whelen Mike
I found the mike. Good shape, probably NOS but minor scuffs, I can send photo. Marked Whelen 43-0145258-000 with 4 pin straight connector. There's one on eBay similar to what I have, but has the right angle connector.. On 3/28/2010 9:09 AM, Kris Kirby wrote: On Sun, 28 Mar 2010, Joe wrote: Which mike are you looking for? I may have a NOS one somewhere, handheld with Whelen written on it. MCH wrote: I think the 200 was 16 channels with an option for 32 channels. While I'm typing, does anyone have a source for a replacement Whelen microphone element? I can't justify $150 for one from Whelen. Even a source for a good used Whelen mic would be welcome. And sorry about the off-topic post relative to the subject. Please direct any replies to my email address rather than the list. It would be cheaper to ask around and see if someone has a microphone that some dip destroyed out on the road, and put the Whelen cable on the two-way mic. Most of the Motorola - MA/COM mics are made by Shure anyway. -- Kris Kirby, KE4AHR Disinformation Analyst Yahoo! Groups Links
Re: [Repeater-Builder] Outdoor Pole or Wall Repeater Cabinet - Weather Resistant
When I worked in the paging business we had a couple of outdoor Motorola cabinets that worked OK. Maybe you can find one from someone still in the business. I've got one in the garage, but I want it. The other thought would be to stay inside the shelter and connect an outdoor source of air to a sealed cabinet. Kind of a clothes dryer vent in reverse. That way you can bring in fresh air and pressurize the cabinet to keep the acidic air out of the cabinet. 73, Joe, K1ike On 3/27/2010 8:55 AM, kg2bv wrote: Our Club (www.CNYARA.com)is in need of a weather resistant Repeater Cabinet that will house our 2-Meter Repeater, to include all of the equipment necessary (Duplexers, Power Supply, etc) to operate. We currently have a nice interior cabinet, however it has been determined that it is in our best interest to move the Repeater outside of the structure. We are mounting on a Farm Silo the grain creates an acetic atmosphere that plays hell on electronics. I looked these cabinets up commercially and on eBay and they are extremely expensive. Any idea's? 73, Tony, KG2BV kg...@yahoo.com Yahoo! Groups Links
Re: [Repeater-Builder] Re: Sorta OT: Looking for a couple of items
I just turned down a few of these about 6 months ago. Too bad. The problem with the Glenayre exciter is trying to figure out how to program it to the ham bands. There is a company in Illinois that still fixes Quintron/Glenayre stuff, I think they could program one for you. There is one on eBay right now. I maintained a 900MHz Glenarye digital simulcast system here in Connecticut years ago and played with the analog mode, it worked nice. My boss used to listen to the paging channel on a scanner. I used to freak him out with all kinds of sounds and audio on the 900MHz channel. It was fun. 73, Joe, K1ike Mark wrote: Skipp, You wouldn't happen to have an old 900 MHz analog paging exciter laying around, would you? I still have a complete Glenayre paging station that is digital - would like to find an analog exciter to see if I could cobble up a 900 repeater out of it. Mark - N9WYS
Re: [Repeater-Builder] Noise Level on a Duplexer
Hello Kent, Have you looked at the noise on a spectrum analyzer? Is is broadbanded noise, or is it just on your receiver frequencies? If it is only on specific frequencies, is it frequency stable or does it drift around? Also, do any of your transmitters stay constantly keyed up? I'm wondering if something external to your system is oscillating. Your signals may be causing it to go into self-oscillation. When you shut your system off it stops. This is just a guess right now. 73, Joe, K1ike http://sg.rd.yahoo.com/sg/mail/domainchoice/mail/signature/*http://mail.promotions.yahoo.com/newdomains/sg/
Re: [Repeater-Builder] Noise Level on a Duplexer
What frequency are you on? Joe Kent Chong wrote: Hello Everybody, Good day. We have developed a Duplexer to combine to two signals form two systems for in-building application. The Dupluxer (or combiner) has specifications of 1.7dB insertion loss and 60dB isolation. When we set up the system and power on the two systems, the combiner works fine. However, we notice that the noise level (up link) on the two systems will slowly increase, and until 3~4 days later, the noise level has increased to -80~-60dBm level. We then power down the systems for 3 hours, and power them up again. The systems work fine again. Anybody could help? Best Regards, Kent New Email names for you! http://sg.rd.yahoo.com/sg/mail/domainchoice/mail/signature/*http://mail.promotions.yahoo.com/newdomains/sg/ Get the Email name you've always wanted on the new @ymail and @rocketmail. Hurry before someone else does!
Re: [Repeater-Builder] LMR Cable
Konstantinos Hatzakis wrote: / LMR and similar cables are not rated for low PIM Kindly let me Know what exactly PIM means 73s rffun / Go to: http://en.wikipedia.org/wiki/Intermodulation Scroll down to Passive intermod. 73, Joe, K1ike Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) * To change settings via email: repeater-builder-dig...@yahoogroups.com repeater-builder-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: repeater-builder-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Spectrum S-7R repeater interface help needed
I copied the manual for the SCR-77 repeater years ago and posted it at another group. Some of the boards may be similar or the same: http://groups.yahoo.com/group/Repeater/files/SCR77%20Repeater/ The manual is in GIF and JPG format, not very good, but usable. Someday I'll scan it to a PDF. The SCom Controllers web site has information on how to interface their controllers to an SCR-77 or SCR-1000 controller. You may be able to use some of this information for interfacing your repeater and controller: http://www.scomcontrollers.com/downloads/6kmanualv20.pdf http://www.scomcontrollers.com/downloads/5kmanualv20.pdf I thought that I had a manual for the SCR-7 repeater, I'll take a look for it. I think we all would be interested in seeing your controller. Any photos? 73, Joe, K1ike yeahright26 wrote: I am working on adding a controller to an S-7R UHF repeater. I do not have the manual for it. It has a simple controller which I understand has to be bypassed. I pulled off the two header connectors going to the controller which, of course, disabled it. I made up a wiring harness using the legend on top of the transmitter. I have power and RX audio. I have no COR or PTT. Was I supposed to pull only one of the connectors? Is a jumpper needed somewhere? Just thought I'd ask the questions before making myself nuts tracing wires. Anyone have the manual for this beastie? I'll check back for answers or my direct email is blair at uddle dot com. PS the control board I am attempting to install is of my own design and was done for a friend (who actually owns this repeater). It has a CW IDer, dual multi-tone courtesy tones, hang time, time out timer, and audio switch. Either courtesy tone can also be 1-5 cw characters. Everything gets programmed with 2 buttons and stored in non-volatile memory. He wanted 20 of them but I went and made 100. This will perhaps be of interest to someone. The goal was not to make a full blown controller as much as a custom courtesy tone generator. Yahoo! Groups Links
Re: [Repeater-Builder] Re: Two coax and connector questions
This explains a lot. I was at a hamfest up in New Hampshire and a couple of guys were buying a 15 foot length of 1 5/8 heliax for a CB mobile installation. Joe larryjspamme...@teleport.com wrote: The only people I've ever seen using heliax (1/2) to run to their mobile antennas, wattmeters, etc. are those CB'ers who like to do the High-Power Shootouts.
Re: [Repeater-Builder] Interference
Are you hearing the audio from the FM station clearly through the 2 meter repeater? If so, the problem may not be coming from the antenna system. It may be coming in on the AC power line or the FM station ground system. You may try putting a dummy load on the farthest point that is possible, such as the jumper that connects to the hard line. You might also try powering the repeater off a battery and unplug/disconnect the AC power supply. In either case, you should not hear the interference. I had a similar problem from an FM broadcast station that had it's transmitter on the second floor of a wood building. The building was on top of a hill that was all rock. It turned out that the radiation was coming from the long ground wire that went to an old, ineffective ground system. The system that was hearing the interference was ~10 miles away. 73, Joe, K1ike Leroy A. M. Baptiste wrote: Hello all, I am having some interference problems, it is coming from an FM transmitter on 94.500MHz, and getting into the Amateur Radio repeater’s receiver on 146.1600MHz. It is not there all the time, but when the repeater is keyed up, you can hear it getting in. The 2 Meter repeater is fed with heliax cable from the duplexer to the antenna, the transmission line on the FM station is ordinary coaxial cable, the power output is about 300 Watts, any ideas? Leroy. J39AI Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) * To change settings via email: repeater-builder-dig...@yahoogroups.com repeater-builder-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: repeater-builder-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Interference
I'm thinking the same thing, audio chain. I would be surprised if the 5KHz deviation receiver could recover much audio from a wide band FM broadcast station. If the FM station is audio on the 2 meter receiver is very clear, I would say audio chain like you are stating. Joe Larry Horlick wrote: Is it IMD, though? Could it be in the audio chain? Leroy, did you troubleshoot from this angle? Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) * To change settings via email: repeater-builder-dig...@yahoogroups.com repeater-builder-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: repeater-builder-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] LOOONG audio runs
Oz, in DFW wrote: Make sure you use twisted pair. Station wire like that use to wire houses is often not twisted. Ethernet cable is good and has a high twist pitch - better for this application. I wonder if CAT 6 would be better than CAT5 due to the difference in twist? Joe
Re: [Repeater-Builder] Pair of GM300 as a repeater
Hello Leroy, How did you program the radios? In other words, using the software how did you set up the Radiowide and Mode options in each radio. Specifically the Options settings. 73, Joe, K1ike Leroy A. M. Baptiste wrote: . I will be happy to share more info.
Re: [Repeater-Builder] Motorola cabinet key wanted
Hello Don, Look at the bright side of life. Tomorrow you'll be having fun looking for it again! 73, Joe, K1ike Also heading for the other side of the hill... ka9qjg wrote: Let Me tell You youngsters out here How bad Memory loss is , as Some of us get older I could swear that on this group or one I use Someone Posted a File about KEYS But for the life of Me I cannot find it , It listed Everything .
Re: [Repeater-Builder] manual and service manual scanning (digitize to PDF)
My HP PSC2410 Photosmart all-in-one Printer/Fax/Scanner/Copier came with software that will scan something into many formats, including PDF files. The only thing I find is that the size of the PDF file is rather large. 73, Joe, K1ike Benjamin L. Naber wrote: Thanks to those whom commented. I like the idea of being able to have someone else spend time on scanning manuals instead of me for a little money. However, it's also good to know how to do it myself when I have only one or two items as a time.
Re: [Repeater-Builder] Antenna tuner question - slightly OT
Sounds like a T match L-C-L tuner. The advantage would be that it is a low-pass tuner that attenuates harmonics. This was important in the old days when rigs put out harmonics. I got a pink slip as a novice years ago for being on the 40 meter band when I was suppose to be on 80 meters. 73, Joe, K1ike va...@securenet.net wrote: Gents I need a quick reply to this very pressing question. I have an HF antenna tuner that uses 2 roller inductors and 1 large air variable cap, versus the more popular arrangement of 2 varicaps and 1 inductor. What is the 2 inductor - 1 capacitor arrangement called? Certainly not a T-Match (I don't think) Thanks Ian VA2IR Montreal Trustee VE2RJS repeater Yahoo! Groups Links
Re: [Repeater-Builder] Bend an ICOM a little further
Was the crystal that you got for 146.06RX made for a MASRTII radio, or something else? The cut can be different for different radio manufacturers. I have purchased only crystals for MASTRII and recrystalled my ICOMs with good luck. If I need to net them on frequency I use capacitors from the spare ICOMs that I have from the various mobile radios I have for spare parts. Lately, I have been sending the ICOMs back to ICM for recrystalling and temperature compensation. Yes it costs more, but I think it's worth it. Personally, I don't think that the club should have a repeater if they have no funding. You are supplying free labor, they should be able to spring for a few bucks. 73, Joe, K1ike On Feb 16, 2010, at 9:57 PM, KE4ZDG wrote: Hey folks, I'm working on a GE Mastr II high band repeater. Someone gave me some crystals that were made up for 146.010 RX. I installed one in an EC ICOM and the best I can adjust for is 146.0064, which sounds really scratchy when I inject a 3k deviation signal on 146.010. When I tune the monitor down to 146.0064, the RX audio cleans right up. I've backed out the screw until there's no more threads left in the ICOM. Is there a capacitor I can change or add to give me a little more tuning range to the ICOM? I just need the crystal to go up a hair more (400 Hz on the crystal freq). I know I'm promoting cheapness by not buying another crystal, but the club doesn't have much money to spend. Thanks, Jared
[Repeater-Builder] GR300 repeater: Converting from narrow to wide band troubles
Hello to All, This is my first attempt at working on a Motorola GR300 repeater. It is using the GM300 radios and ZR310 controller. I have replaced the GM300 radios with wide band units and almost have it working. The original repeater functioned fine. I replaced the receive radio and got it working OK. Next I replaced the transmit radio and I'm having a problem. The transmit radio works fine by itself. When I put it in the GM300 cabinet it keys up momentarily and drops. It will not key again until the 5 second timer runs out, then I can get it to momentarily key again. I've gone through the programming, but cannot find a difference between the good and bad transmit radios. I checked the option jumpers in the old and new radios. Now I'm not sure if I'm programming it correctly. The software has a radio mode and a repeater mode. Which one do you use for programming the radios? It looks like it could be done either way. I've been using the Radio mode. I'm probably missing something simple, but just don't see it. I'm working on this for a ham friend and it's gotten out of control time-wise. I'd like to get this resolved so I can move on to other projects. Thanks ahead of time, 73, Joe, K1ike Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) * To change settings via email: repeater-builder-dig...@yahoogroups.com repeater-builder-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: repeater-builder-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] For Sale: Andrew F2PNM (Ver2) N Male connectors for HELIAX FSJ2-50 Coaxial Cable
I have 8 new, in the box and sealed in plastic, F2PNM connectors for sale. This is for the popular 3/8 Superflex cable that some use for jumpers. $7 each or all 8 for $50, plus shipping. The boxes are slightly shop-worn. 73, Joe, K1ike
Re: [Repeater-Builder] PURC Lowband station SCR replacement
Thanks Allan, your help is much appreciated! Joe allan crites wrote: Joe, The M9349 is an RCA 2N3525. AC --- On *Sat, 2/6/10, Joe /k1ike_m...@snet.net/* wrote: From: Joe k1ike_m...@snet.net Subject: [Repeater-Builder] PURC Lowband station SCR replacement To: Repeater-Builder@yahoogroups.com Date: Saturday, February 6, 2010, 5:07 PM Just a long shot We are repairing a PURC high power base station that uses an SCR marked 9349 for switching a bias voltage. Anyone know of a source or replacement for the Motorola 9349 SCR? Thanks, Joe
Re: [Repeater-Builder] RFS TDE-7780A
Correct, but if I remember you were claiming 3dB loss at the pass frequencies. I was seeing about 1.5dB loss. I claimed respectable results, not perfect results. I think it is still acceptable for ham use. Everything is a compromise when you push the equipment past it's limits, but the typical ham is frugal (aka me) and accepts a little degradation for economy. 73, Joe, K1ike Another parsimonious Yankee ham. 73, Joe, K1ike Eric Lemmon wrote: Joe, Your screen shots actually prove my point. Both of the pass plots reveal that your duplexer's pass response is far from optimum, which is precisely the reason for selecting the proper duplexer model to tune. If your duplexer was originally designed for operation in the 440-450 MHz band, the peak of the pass plots and the nadir of the notch plots would be exactly 5 MHz apart. Your TX pass plot shows that the peak is about 900 kHz to the left of your desired frequency, and your RX pass plot shows that the peak is off-scale to the right- considerably more than a MHz away from the desired frequency. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Joe Sent: Friday, February 05, 2010 6:55 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] RFS TDE-7780A Eric, I tuned up a 633-6A from a GR-300 recently and got some respectable results. Pass frequency loss was around -1.5dB and notch loss was around -85 to -90dB. I've attached the sweeps. 73, Joe, K1ike Eric Lemmon wrote: Paul, The Motorola TDE7780A duplexer is simply a relabeled Celwave 633-6A-2N unit, and it is designed for 450-470 MHz. It is the standard duplexer furnished in GR300, GR1225, RKR1225, and CDR700 repeaters. The duplexer is okay for non-critical use at low-density RF sites, such as at construction sites. The compact mobile notch design has very little bandpass action, since its operation is based solely upon the notch. I have tried to tune such duplexers down into the Amateur 70cm band, with little success. snip Yahoo! Groups Links
[Repeater-Builder] PURC Lowband station SCR replacement
Just a long shot We are repairing a PURC high power base station that uses an SCR marked 9349 for switching a bias voltage. Anyone know of a source or replacement for the Motorola 9349 SCR? Thanks, Joe
Re: [Repeater-Builder] RFS TDE-7780A
I wonder what they do to the internal coupling at the factory when they tune them. Maybe it is something that can be done in the field with a little surgery? Joe Eric Lemmon wrote: Point taken. One factor that will directly affect how the subject duplexer will perform at 70cm is where the original factory tuning was. For example, if the factory tuning was in the 450-455 MHz band, such a duplexer will likely perform better at 70cm than will a duplexer that originally was factory-tuned for the 460-465 MHz band. The results I quoted were for a duplexer in the latter class. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Joe Sent: Saturday, February 06, 2010 2:59 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] RFS TDE-7780A Correct, but if I remember you were claiming 3dB loss at the pass frequencies. I was seeing about 1.5dB loss. I claimed respectable results, not perfect results. I think it is still acceptable for ham use. Everything is a compromise when you push the equipment past its limits, but the typical ham is frugal (aka me) and accepts a little degradation for economy. 73, Joe, K1ike Another parsimonious Yankee ham. 73, Joe, K1ike
Re: [Repeater-Builder] Re: Cable lengths again
Jeff, were your inter cavity jumpers Type RG-8A/U cable? Just wondering..Joe Jeff DePolo wrote: I'll confirm also, 12 from last cavity to antenna tee, RG214. Intra-cavity is 11.5. Measurements are tip-to-tip on the type N connectors. I've done the harnesses for the older PD 526's that had RG8 on them. Some of the newest 526's have RG400 coax instead of RG214 FWIW. --- Jeff WN3A
[Repeater-Builder] Motorola 220
Hi to all: I have a 220 Motorola CDM 1550-LS and I would like to use it for the ham ban . Can this radio be converted and if so what do I have to do to do it. Any information will be helpful. Thank you.
