Re: [Repeater-Builder] showing our age (old HT's)
At 08:19 AM 07/28/10, you wrote: GE PR36, shudder! A brick with wires that easily broke when the case was opened or shut. Not a nice radio to have on the bench. I ran a Portamobile 1 on 52.525 about 10 years ago, guess I'll have to dig it out of the storage and see what shape it's in these days. Moving slightly off topic, I recently came across a Motorola mobile mic with the cast metal housing. A real favorite of the cops back in the day; it had many uses, only one of which had anything to do with communicating via voice. Other uses had to do with communicating, but were more non-verbal in nature and directed at the jerk in the back seat of the cruiser. Milt N3LTQ On alternate means of communication... Ten to fifteen years ago there was a gentleman that used to be seen at every last-saturday-of-the-month electronics / ham radio swap meet... Always wore the same baseball cap, and always was looking for only one thing. All he'd buy were the old cast metal-case microphones, and he'd buy them in any condition, as long as the case was intact and undented. One day I commented on him to one of the guys that ran the swap meet .. and was told that it had taken a year or so to figure the guy out. It seemed that he wouldn't tell anybody why he was buying just microphones, but finally he was seen selling at another swap meet, in a hispanic part of town on one saturday and an oriental part of town another saturday. Apparently the gentleman in question bought the mics for a dollar or two, he'd take them home, strip them and bead-blast the cases, then chrome most of them and powder coat the rest of them. They'd get new mic elements, PTT switches, and cords. The guy would sell the new mics to taxicab drivers - apparently the hispanic drivers loved the chrome and the oriental drivers loved the powder coat... He was selling the chromed ones outright, with your choice of GE or Moto connectors, and taking orders with up-front deposits for your choice of color powder coat and connector type. It seems that a metal case mic is NOT considered an offensive weapon by police investigators... but makes a dandy defensive one when swung at the end of a few inches of mic cord... it would quiet down any unruly customer. Mike WA6ILQ
[Repeater-Builder] Fw: TKR750 -Preamp
- Original Message - From: Com/Rad Inc To: kenwood_...@yahoogroups.com Sent: Wednesday, July 28, 2010 7:39 PM Subject: TKR750 -Preamp Greetings Group Have any of you experimented with a RX pre-amp for the TKR 750 repeater? I am seeking results of actual trials of a product - Anyone care to comment on their experience(s) ? Thanks in advance Ed Folta Com/Rad Inc Des Plaines IL USA
Re: [Repeater-Builder] Fw: TKR750 -Preamp
At 04:30 AM 7/29/2010, Com/Rad Inc wrote: ubject: TKR750 -Preamp Greetings Group Have any of you experimented with a RX pre-amp for the TKR 750 repeater? I am seeking results of actual trials of a product - Anyone care to comment on their experience(s) ? We use AngleLinear PHEMT preamps all the time on TKR-750's that we sell. They work very well without overloading the front end as many of the higher gain ones on the market do (generally, 12 to 15 dB is all that is needed in a receiver system, not the 20 to 24 dB some preamps deliver. Ken -- President and CTO - Arcom Communications Makers of repeater controllers and accessories. http://www.arcomcontrollers.com/ Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net We don't just make 'em. We use 'em!
RE: [Repeater-Builder] Re: Base station coax connector weatherproofing recommendations?
I think you (Skipp) may be confusing 130C with one of the other 3M products. 130C is the self-vulcanizing (self-amalgamating?) tape. It has no adhesive; it's not sticky or gooey; itt doesn't leave any residue. In fact, it doesn't even leave a black stain on connectors like regular vinyl electrical tape; it leaves nothing behind. 3M et al make mastic pads/tapes which, for lack of a better descrption, are like vinyl electrical tape with taffy already attached to one side, with a liner that you remove before applying (i.e. to keep the taffy from sticking to the next layer of tape in the roll. Maybe that's what you're thinking of, Skipp? Even without a courtesy wrap, 130C comes off nice a clean when you slit it with a knife, no muss, no fuss. I've been a big fan/proponent of splicing tape for many years, having been introduced to it by a power plant engineer who showed me how they used it for underground direct-bury high voltage splices. Alternate the 130C with 88, each with an up-down-up wrap, and I've never had a leak. Tape n' taffy is quite effective, and arguably, requires less skill to apply (i.e. I don't force tower crews to use 130C/88 if they're comfortable/trained to do it with taffy), but it's messy if you have to open up the connection, but that can be partially alleviated by using a courtesy wrap. But when I'm doing it myself, I use splicing tape and 88. For the splicing tape I use either 3M 130C or the Plymouth equivalent (can't think of the number off the top of my head). I have a few rolls of the self-fusing silicone tapes that Times, Nashua, Andrew, et al are pushing. It's OK, but I don't see it as being any better than 130C+88. It's a lot more expensive too. Too early to tell how well it holds up to UV, but I would imagine it would do OK. Being silicone, other adhesives (such as vinyl electric tape) don't stick to it well. --- Jeff WN3A -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of ve7fet Sent: Thursday, July 29, 2010 12:22 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Base station coax connector weatherproofing recommendations? Pulling it back apart isn't an issue with the 130C if you apply it sticky side out. Once you slit down through the vinyl and 130c with a knife, you can peel it apart to open up the splice. Yeah, its a little work to get it to release from the jacket of the cable... but its doing its job keeping the water out. It usually releases from the metal connector parts fairly readily. Lee --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com , skipp025 skipp...@... 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. Pulling 130c direct from a connector is a real $#$%* Having a base layer of tape below the 130c can and will make your change order life much happier. s.
Re: [Repeater-Builder] Fw: TKR750 -Preamp
Where does one obtain these and at what cost? Doug On 29/07/2010 15:58:54, Ken Arck (ah...@ah6le.net) wrote: At 04:30 AM 7/29/2010, Com/Rad Inc wrote: ubject: TKR750 -Preamp Greetings Group Have any of you experimented with a RX pre-amp for the TKR 750 repeater? I am seeking results of actual trials of a product - Anyone care to comment on their experience(s) ? We use AngleLinear PHEMT preamps all the time on TKR- 750's that we sell. They work very well without overloading the front end as many of the higher gain ones on the market do (generally, 12 to 15 dB is all that is needed in a receiver system, not the 20 to 24 dB some preamps deliver. Ken -- President and CTO - Arcom Communications Makers of repeater controllers and accessories. http://www.arcomcontrollers.com/ Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net We don't just make 'em. We use 'em! Yahoo! Groups Links
[Repeater-Builder] Re: Measure return loss and cable fault with HP 8924C
Hi, Thanks for your info. Though a bit complicated, it is still doable. By the way, how to measure the cable fault location without the 11807 software? Thanks and Regards, Dickson Fu VR2WHF --- In Repeater-Builder@yahoogroups.com, ve7fet yahoogro...@... wrote: First you'll need a return loss bridge. No replacing that. The 11807 software can make things a little prettier, but you can still do return loss quite easily. Distance to fault is going to be a bit more challenge, but it can be done too. Return loss is the easiest to set up. You'll need to set up the tracking generator/spectrum analyzer for the range you want to measure. Use the Duplex Output and connect it to the Source port on the RLB. Use the Antenna Input and connect it to the Reflected port on the RLB. You optionally may want to put a 6dB pad in between the Duplex Out and RLB Source port. With the DUT port open on the RLB, you should have a trace on the spectrum analyzer over the range you are sweeping. Now, you can turn up the output power of the Duplex Port until the trace gets close to the reference level at the top, or go into the menus on the spectrum analyzer and do a Save A and then a A-B to null out the sweep. Now, when you put a good load on the DUT port, you should get a return loss down ~40dB or so. Hook up the DUT you want to sweep and go. Yes, this is quick and dirty, but it gets the job done when you are not looking for fractions of a dB... Lee --- In Repeater-Builder@yahoogroups.com, Dickson dicksonfuhk@ wrote: Hi all, Without the RF Tools provided by 11807E opt 100 on HP 8924C, how to measure return loss and cable fault? The 11807E opt 100 provides the IBASIC program that can show the return loss profile over the range of frequency and indicates the max/min return loss and the corresponding frequency. Thanks and Regards, Dickson Fu VR2WHF
Re: [Repeater-Builder] Fw: TKR750 -Preamp
At 10:30 AM 7/29/2010, Doug Hutchison wrote: Where does one obtain these and at what cost? http://www.anglelinear.com Chip Angle is arguably one of the top 10 RF guys in the world Ken -- President and CTO - Arcom Communications Makers of repeater controllers and accessories. http://www.arcomcontrollers.com/ Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net We don't just make 'em. We use 'em!
Re: [Repeater-Builder] Fw: TKR750 -Preamp
Another very good choice for this application is the GLB Preselector / Preamp from Simrex Corp. I have several of these deployed on 144 / 220 / 440 Amateur repeaters and they all perform very well. They can be tuned to maximize gain or selectivity per your requirements and their support is outstanding. http://www.simrex.com/site/products/special.htm PRESELECTOR PREAMPLIFER a.. Low cost solution to interference, intermodulation and desensitization problems. b.. Helical Resonator Design. c.. Preselector Specifications (pdf 63k) d.. Preselector Example Diagram (pdf 10k) - Original Message - From: Ken Arck To: Repeater-Builder@yahoogroups.com Sent: Thursday, July 29, 2010 2:15 PM Subject: Re: [Repeater-Builder] Fw: TKR750 -Preamp At 10:30 AM 7/29/2010, Doug Hutchison wrote: Where does one obtain these and at what cost? http://www.anglelinear.com Chip Angle is arguably one of the top 10 RF guys in the world Ken -- President and CTO - Arcom Communications Makers of repeater controllers and accessories. http://www.arcomcontrollers.com/ Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net We don't just make 'em. We use 'em!
Re: [Repeater-Builder] Fw: TKR750 -Preamp
Thank you both. Doug On 29/07/2010 19:34:24, Steven M Hodell (st...@shodell.net) wrote: Another very good choice for this application is the GLB Preselector / Preamp from Simrex Corp. I have several of these deployed on 144 / 220 / 440 Amateur repeaters and they all perform very well. They can be tuned to maximize gain or selectivity per your requirements and their support is outstanding. http://www.simrex.com/site/products/special.htm PRESELECTOR PREAMPLIFER * Low cost solution to interference, intermodulation and desensitization problems. * Helical Resonator Design. * Preselector Specifications [link: preselector/Preselector1.pdf](pdf 63k) * Preselector Example Diagram [link: preselector/preselector_diagram. pdf](pdf 10k) - Original Message - From: Ken Arck [link: mailto:ah...@ah6le.net] To: Repeater-Builder@yahoogroups.com Sent: Thursday, July 29, 2010 2:15 PM Subject: Re: [Repeater-Builder] Fw: TKR750 -Preamp At 10:30 AM 7/29/2010, Doug Hutchison wrote: Where does one obtain these and at what cost? http://www.anglelinear.com Chip Angle is arguably one of the top 10 RF guys in the world Ken -- President and
[Repeater-Builder] Re: 420Mhz Radio for Voter?
Those CDM radios are a bit pricy at $550 each. But I appreciate the suggestion. And you've given me some ideas. I still like the idea of building an out of band repeater for the remote receive site from a Micor chassis. I would need a 406-420 exciter, bandpass filter and trippler. If anybody on the list has those or can help me find them I'd really appreciate it. --- In Repeater-Builder@yahoogroups.com, James Adkins adkins.ja...@... wrote: I am using the Motorola CDM series of radios for 420-425 MHz links from voting sites. They make a low-split UHF split that covers 403-470 MHz out of the box, no mods needed. On the transmit sites, you will want to use a fan for cooling. We mount the RX radio and a UHF TX radio on a 1U rack shelf, use a 4 hole saw and drill a hole under the UHF TX radio, and purchase a nice Dayton 24vdc fan that is actually a ball bearing fan that you can count on for years of use, and let it go. Have not had any problems to date with these rigs over a 4 year span. at W6KGBs article on moving 450-470 Mastr IIs to 420-450. It's on the GE Mastr II page at repeater-builder. You could use a Mastr II UHF mobile with the receiver, exciter and IPA converted to 420, then use the receiver in an aux receiver chassis at the voter site. You wouldn't need to convert the PA, the IPA (driver) and a beam would be enough for a point-to-point link. Bob Meister WA1MIK did an article on converting the multiplier chains so that the UHF Micor receivers could hear down as low as 435 MHz (where the front ends run out of tuning range). Mike WA6ILQ At 05:10 PM 07/27/10, you wrote: Thanks Jeff, I'll keep looking around for those low split UHF Micor receivers. What about the transmit side? Maybe I should look for a unified chassis low split UHF repeater. Swap out the UHF receiver for a VHF high band receiver and use that for my remote receiver site. Then use the low split UHF receiver on the other end of the link. That make sense? --- In Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com, Jeff DePolo jd0@ wrote: When you say low split, are you talking about the Motorola TRE1201/TRE8031 406-420 Mhz receivers? I don't have a manual in front of me, but yes, 406-420 receivers, they'll work fine well into the mid 430's without mods. What Canadian sources might have these? Well, Spantek comes to mind as a dealer. CW Wolfe used to get a lot of stuff out of Canada, but I haven't talked to Bud in quite a few years, not sure if he's still in business. This list is probably the best resource. eBay as an alternative. If you get desperate I still have a few dozen low-split Micors in the warehouse, but really don't have the time (or patience) to deal with packing and shipping radios for what few dollars I'd get out of them (i.e. value of my time $value of radio). But if you just wanted a receiver, you can consider me a last resort if you strike out everywhere else... --- Jeff WN3A --- In Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder%2540yahoogroups.com , Jeff DePolo jd0@ wrote: What is a good radio for building a one way 420 link? The link will be for a remote receiver and will not need to be duplex... RX at the voter and TX at the remote receiver. The link RX has to live on a noisy hill. Thanks for your advice. My preferences, in no particular order, would be Micor/SpectraTAC (low split), Mastr II (77 split), and Delta-S (low-split). MVP/Exec II (again, 77 split) would be fine too. All have excellent front ends. They can be found if you look a bit, especially check Canadian sources; they're not as easy to find stateside as 450-470 radios, but they're not unobtainium either. --- Jeff WN3A Yahoo! Groups Links -- James Adkins, KB0NHX Vice-President -- Nixa Amateur Radio Club, Inc. (KC0LUN) www.nixahams.net Southern Missouri Assistant Frequency Coordinator - Missouri Repeater Council www.missourirepeater.org The Nixa Amateur Radio Club - There is no charge for awesomeness! (Well, only $1.00 per month)
[Repeater-Builder] Re: 420Mhz Radio for Voter?
I emailed Spantek. They told me they don't do Micor's any more. CW Wofle appears to not be in business as I can't find them on the web. Any other ideas where I might find some UHF low split Micor parts? --- In Repeater-Builder@yahoogroups.com, Mike Morris wa6...@... wrote: Look at W6KGBs article on moving 450-470 Mastr IIs to 420-450. It's on the GE Mastr II page at repeater-builder. You could use a Mastr II UHF mobile with the receiver, exciter and IPA converted to 420, then use the receiver in an aux receiver chassis at the voter site. You wouldn't need to convert the PA, the IPA (driver) and a beam would be enough for a point-to-point link. Bob Meister WA1MIK did an article on converting the multiplier chains so that the UHF Micor receivers could hear down as low as 435 MHz (where the front ends run out of tuning range). Mike WA6ILQ At 05:10 PM 07/27/10, you wrote: Thanks Jeff, I'll keep looking around for those low split UHF Micor receivers. What about the transmit side? Maybe I should look for a unified chassis low split UHF repeater. Swap out the UHF receiver for a VHF high band receiver and use that for my remote receiver site. Then use the low split UHF receiver on the other end of the link. That make sense? --- In Repeater-Builder@yahoogroups.com, Jeff DePolo jd0@ wrote: When you say low split, are you talking about the Motorola TRE1201/TRE8031 406-420 Mhz receivers? I don't have a manual in front of me, but yes, 406-420 receivers, they'll work fine well into the mid 430's without mods. What Canadian sources might have these? Well, Spantek comes to mind as a dealer. CW Wolfe used to get a lot of stuff out of Canada, but I haven't talked to Bud in quite a few years, not sure if he's still in business. This list is probably the best resource. eBay as an alternative. If you get desperate I still have a few dozen low-split Micors in the warehouse, but really don't have the time (or patience) to deal with packing and shipping radios for what few dollars I'd get out of them (i.e. value of my time $value of radio). But if you just wanted a receiver, you can consider me a last resort if you strike out everywhere else... --- Jeff WN3A --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com , Jeff DePolo jd0@ wrote: What is a good radio for building a one way 420 link? The link will be for a remote receiver and will not need to be duplex... RX at the voter and TX at the remote receiver. The link RX has to live on a noisy hill. Thanks for your advice. My preferences, in no particular order, would be Micor/SpectraTAC (low split), Mastr II (77 split), and Delta-S (low-split). MVP/Exec II (again, 77 split) would be fine too. All have excellent front ends. They can be found if you look a bit, especially check Canadian sources; they're not as easy to find stateside as 450-470 radios, but they're not unobtainium either. --- Jeff WN3A Yahoo! Groups Links
[Repeater-Builder] Re: Moving a MSF5000 from 800 to 900 Ham
I have move the800 mhz chunk to 900 ham operation wide dev. I have not had time to test the pa's to see how happy they can be tricked to efficient operation. The chunk is the easy part, getting those 150 and 75 watt 800 pa's may result in a lot of hair on the floor. . Bill Atlanta --- In Repeater-Builder@yahoogroups.com, Mark n9...@... wrote: Don't think it'll go that far... the articles at R-B will tell you for certain. I guess the easiest way is to read the station programming and see where it is now... if it's in the 800 MHz band, it won't go to 900. Mark - N9WYS -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chucklesk Sent: Tuesday, July 27, 2010 4:54 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Moving a MSF5000 from 800 to 900 Ham Sory I meant the lower 800 Mhz one./...not the 896Mhz split --- In Repeater-Builder@yahoogroups.com, Chuck Kraly ckraly@ wrote: it looks like the 800 Mhz on. C85CXB5103BT On Tue, Jul 27, 2010 at 2:58 PM, Mark n9wys@ wrote: Which 800 station are you trying to move? It needs to be an 896 station to actually work on 900 - the lower 800 radio won't go far out-of-band enough. Start here for info: http://www.repeater-builder.com/motorola/msf/msf-index.html Mark - N9WYS -Original Message- From: Repeater-Builder@yahoogroups.com On Behalf Of Chucklesk Sent: Tuesday, July 27, 2010 12:24 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Moving a MSF5000 from 800 to 900 Ham Well, I have heard that it can be done...question is how big a pain is it? We have access to a couple and before we nab them, wanted to feel out how much effort they would be or to wait for some other opportunity Also is it documented on the web anywhere? Yahoo! Groups Links Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.851 / Virus Database: 271.1.1/3034 - Release Date: 07/28/10 03:37:00
[Repeater-Builder] Re: Moving a MSF5000 from 800 to 900 Ham
I have move the800 mhz chunk to 900 ham operation wide dev. I have not had time to test the pa's to see how happy they can be tricked to efficient operation. The chunk is the easy part, getting those 150 and 75 watt 800 pa's may result in a lot of hair on the floor. If some one wants to tackle this project I will work with you from afar. . Bill Atlanta --- In Repeater-Builder@yahoogroups.com, Mark n9...@... wrote: Don't think it'll go that far... the articles at R-B will tell you for certain. I guess the easiest way is to read the station programming and see where it is now... if it's in the 800 MHz band, it won't go to 900. Mark - N9WYS -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chucklesk Sent: Tuesday, July 27, 2010 4:54 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Moving a MSF5000 from 800 to 900 Ham Sory I meant the lower 800 Mhz one./...not the 896Mhz split --- In Repeater-Builder@yahoogroups.com, Chuck Kraly ckraly@ wrote: it looks like the 800 Mhz on. C85CXB5103BT On Tue, Jul 27, 2010 at 2:58 PM, Mark n9wys@ wrote: Which 800 station are you trying to move? It needs to be an 896 station to actually work on 900 - the lower 800 radio won't go far out-of-band enough. Start here for info: http://www.repeater-builder.com/motorola/msf/msf-index.html Mark - N9WYS -Original Message- From: Repeater-Builder@yahoogroups.com On Behalf Of Chucklesk Sent: Tuesday, July 27, 2010 12:24 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Moving a MSF5000 from 800 to 900 Ham Well, I have heard that it can be done...question is how big a pain is it? We have access to a couple and before we nab them, wanted to feel out how much effort they would be or to wait for some other opportunity Also is it documented on the web anywhere? Yahoo! Groups Links Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.851 / Virus Database: 271.1.1/3034 - Release Date: 07/28/10 03:37:00
Re: [Repeater-Builder] Re: 420Mhz Radio for Voter?
On 7/29/2010 2:36 PM, Tim - WD6AWP wrote: I emailed Spantek. They told me they don't do Micor's any more. CW Wofle appears to not be in business as I can't find them on the web. Any other ideas where I might find some UHF low split Micor parts? If it's got to be Micor it's hamfest fodder. Too heavy for eBay for the most part. I'd ask over on Batlabs, check with MDM in Chicago, and maybe Andy Brinkley. The stuff is still out there, but it's boat anchor class now. I'm a Motorola fan, but I prefer MastrII/MVP for this stuff. Even the 450 stuff tunes down to 420 without much trouble. If it has to have batwings on the label, I have some low power (25 or 30 W?) 403-430 Mitreks that I ought to find a new home for. -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Fw: TKR750 -Preamp
More great info from Frank @ SIMREX. Steve ~ KA1RCI - Original Message - From: Frank Neuperger To: fr...@simrex.com Cc: Steven M Hodell ; maqui Mike Aquilino ; sa...@simrex.com Sent: Thursday, July 29, 2010 4:15 PM Subject: Re: [Repeater-Builder] Fw: TKR750 -Preamp Steve, That did not post to the list because I don't have membership. I would appreciate if you would forward to the list on my behalf. Regards Frank On 7/29/2010 3:58 PM, Frank Neuperger wrote: Steven, Thanks for the vote of confidence. We sell them to Hams (Ham frequencies) for $275($25 less than 2-way dealers) as a gesture to Gil Boelke (silenet key) who developed the preselector and founded GLB (now owned by SIMREX). Note that the standalone preselector is still made in house by staff that were trained by Gil and on tooling built by Gil. It is also the front end of every SNRDS-II radio. Same radios that are part of many FAA and other Federal systems. Standard gain is 8 db For +$25, you can order it with ~4 dB gain and steeper skirts on the filter or ~11 dB gain and gentler slope on the filter skirts. For extreeme interference, one usage of the preselector has been to place a coax stub notch filter between the antenna and the preselector. I have done ~3MHz spacing of the notches of the comb for a marine radio BASE application using ~ 35?? feet of LMR 400 for my stub. One of the notches was placed directly onto the frequency of collocated marine base station giving us an extra 22dB of suppression at that frequency.Using excessive length of coax resulting in a comb allows the overallbandwidth to repeak steeply and with minimal loss between the notches of the comb. A single notch approach (not a comb) when placed close to your desired carrier will often have unacceptable insertional loss at your desired frequency.The comb notch filter is just extra coax and minimizes the insertion loss close to the notch. . The calcs for length are not too difficult. Warmest Regards Frank Neuperger Simrex Corporation VE3FNZ - Original Message - From: Steven M Hodell To: Repeater-Builder@yahoogroups.com Cc: sa...@simrex.com Sent: Thursday, July 29, 2010 2:34 PM Subject: Re: [Repeater-Builder] Fw: TKR750 -Preamp Another very good choice for this application is the GLB Preselector / Preamp from Simrex Corp. I have several of these deployed on 144 / 220 / 440 Amateur repeaters and they all perform very well. They can be tuned to maximize gain or selectivity per your requirements and their support is outstanding. http://www.simrex.com/site/products/special.htm PRESELECTOR PREAMPLIFER a.. Low cost solution to interference, intermodulation and desensitization problems. b.. Helical Resonator Design. c.. Preselector Specifications (pdf 63k) d.. Preselector Example Diagram (pdf 10k) - Original Message - From: Ken Arck To: Repeater-Builder@yahoogroups.com Sent: Thursday, July 29, 2010 2:15 PM Subject: Re: [Repeater-Builder] Fw: TKR750 -Preamp At 10:30 AM 7/29/2010, Doug Hutchison wrote: Where does one obtain these and at what cost? http://www.anglelinear.com Chip Angle is arguably one of the top 10 RF guys in the world Ken -- President and CTO - Arcom Communications Makers of repeater controllers and accessories. http://www.arcomcontrollers.com/ Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net We don't just make 'em. We use 'em!
Re: [Repeater-Builder] Re: 420Mhz Radio for Voter?
Hello Tim. I just looked in my storage site and I found a Micor Base/Repeater which is on the band split of 402-430 MHz. I do not have channel elements for it. I know it was working when it came out of service a few years ago, and the PA can be used as a digital station, as it takes the four pin channel elements. It is the complete base repeater which is designed for continious duty as it has the large pa heatsinks. Let me know if you would like pictures of it. I have $200.00 into it and it weighs alot so I am sure shipping via ground would be around $50.00. If you need the cabinet and power supply it would be $400.00 plus actual shipping. Butch, KE7FEL/r On Thu, Jul 29, 2010 at 1:33 PM, Tim - WD6AWP tisaw...@gmail.com wrote: Those CDM radios are a bit pricy at $550 each. But I appreciate the suggestion. And you've given me some ideas. I still like the idea of building an out of band repeater for the remote receive site from a Micor chassis. I would need a 406-420 exciter, bandpass filter and trippler. If anybody on the list has those or can help me find them I'd really appreciate it. --- In Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com, James Adkins adkins.ja...@... wrote: I am using the Motorola CDM series of radios for 420-425 MHz links from voting sites. They make a low-split UHF split that covers 403-470 MHz out of the box, no mods needed. On the transmit sites, you will want to use a fan for cooling. We mount the RX radio and a UHF TX radio on a 1U rack shelf, use a 4 hole saw and drill a hole under the UHF TX radio, and purchase a nice Dayton 24vdc fan that is actually a ball bearing fan that you can count on for years of use, and let it go. Have not had any problems to date with these rigs over a 4 year span. at W6KGBs article on moving 450-470 Mastr IIs to 420-450. It's on the GE Mastr II page at repeater-builder. You could use a Mastr II UHF mobile with the receiver, exciter and IPA converted to 420, then use the receiver in an aux receiver chassis at the voter site. You wouldn't need to convert the PA, the IPA (driver) and a beam would be enough for a point-to-point link. Bob Meister WA1MIK did an article on converting the multiplier chains so that the UHF Micor receivers could hear down as low as 435 MHz (where the front ends run out of tuning range). Mike WA6ILQ At 05:10 PM 07/27/10, you wrote: Thanks Jeff, I'll keep looking around for those low split UHF Micor receivers. What about the transmit side? Maybe I should look for a unified chassis low split UHF repeater. Swap out the UHF receiver for a VHF high band receiver and use that for my remote receiver site. Then use the low split UHF receiver on the other end of the link. That make sense? --- In Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com Repeater-Builder%40yahoogroups.com, Jeff DePolo jd0@ wrote: When you say low split, are you talking about the Motorola TRE1201/TRE8031 406-420 Mhz receivers? I don't have a manual in front of me, but yes, 406-420 receivers, they'll work fine well into the mid 430's without mods. What Canadian sources might have these? Well, Spantek comes to mind as a dealer. CW Wolfe used to get a lot of stuff out of Canada, but I haven't talked to Bud in quite a few years, not sure if he's still in business. This list is probably the best resource. eBay as an alternative. If you get desperate I still have a few dozen low-split Micors in the warehouse, but really don't have the time (or patience) to deal with packing and shipping radios for what few dollars I'd get out of them (i.e. value of my time $value of radio). But if you just wanted a receiver, you can consider me a last resort if you strike out everywhere else... --- Jeff WN3A --- In Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder%2540yahoogroups.com Repeater-Builder%2540yahoogroups.com , Jeff DePolo jd0@ wrote: What is a good radio for building a one way 420 link? The link will be for a remote receiver and will not need to be duplex... RX at the voter and TX at the remote receiver. The link RX has to live on a noisy hill. Thanks for your advice. My preferences, in no particular order, would be Micor/SpectraTAC (low split), Mastr II (77 split), and Delta-S (low-split). MVP/Exec II (again, 77 split) would be fine too. All have excellent front ends. They can be found if you look a bit, especially check Canadian sources; they're not as easy to find stateside as 450-470 radios, but they're not
Re: [Repeater-Builder] Fw: TKR750 -Preamp
This unit looks like the answer for me..I think! I am in the process of building 2 repeaters on 70cm for possible emergency use by our Amateur Radio Club. Both will be very portable, I have Vertex VX-2200 radios for one, Hamtronics T304/R306 boards for the other. In keeping the units very portable, I am using these filters http://www.polarelectronicindustries.com/model.php/model_id/983/ These filters are being used due to portability, but I have reservations about performance IF my systems end up sited close to other equipment. Would the Simrex unit offer advantages when used with my filters? I would look to getting the higher selectivity spec, in preference to gain. 73, Jack. VK4JRC Sent from my Apple iPad Tablet PC On Jul 30, 2010, at 6:20 AM, Steven M Hodell st...@shodell.net wrote: More great info from Frank @ SIMREX. Steve ~ KA1RCI - Original Message - From: Frank Neuperger To: fr...@simrex.com Cc: Steven M Hodell ; maqui Mike Aquilino ; sa...@simrex.com Sent: Thursday, July 29, 2010 4:15 PM Subject: Re: [Repeater-Builder] Fw: TKR750 -Preamp Steve, That did not post to the list because I don't have membership. I would appreciate if you would forward to the list on my behalf. Regards Frank On 7/29/2010 3:58 PM, Frank Neuperger wrote: Steven, Thanks for the vote of confidence. We sell them to Hams (Ham frequencies) for $275($25 less than 2-way dealers) as a gesture to Gil Boelke (silenet key) who developed the preselector and founded GLB (now owned by SIMREX). Note that the standalone preselector is still made in house by staff that were trained by Gil and on tooling built by Gil. It is also the front end of every SNRDS-II radio. Same radios that are part of many FAA and other Federal systems. Standard gain is 8 db For +$25, you can order it with ~4 dB gain and steeper skirts on the filter or ~11 dB gain and gentler slope on the filter skirts. For extreeme interference, one usage of the preselector has been to place a coax stub notch filter between the antenna and the preselector. I have done ~3MHz spacing of the notches of the comb for a marine radio BASE application using ~ 35?? feet of LMR 400 for my stub. One of the notches was placed directly onto the frequency of collocated marine base station giving us an extra 22dB of suppression at that frequency.Using excessive length of coax resulting in a comb allows the overallbandwidth to repeak steeply and with minimal loss between the notches of the comb. A single notch approach (not a comb) when placed close to your desired carrier will often have unacceptable insertional loss at your desired frequency.The comb notch filter is just extra coax and minimizes the insertion loss close to the notch. . The calcs for length are not too difficult. Warmest Regards Frank Neuperger Simrex Corporation VE3FNZ - Original Message - From: Steven M Hodell To: Repeater-Builder@yahoogroups.com Cc: sa...@simrex.com Sent: Thursday, July 29, 2010 2:34 PM Subject: Re: [Repeater-Builder] Fw: TKR750 -Preamp Another very good choice for this application is the GLB Preselector / Preamp from Simrex Corp. I have several of these deployed on 144 / 220 / 440 Amateur repeaters and they all perform very well. They can be tuned to maximize gain or selectivity per your requirements and their support is outstanding. http://www.simrex.com/site/products/special.htm PRESELECTOR PREAMPLIFER Low cost solution to interference, intermodulation and desensitization problems. Helical Resonator Design. Preselector Specifications (pdf 63k) Preselector Example Diagram (pdf 10k)
[Repeater-Builder] Re: TKR-750 RF Preamplifiers
Re: TKR-750 RF Preamplifiers Com/Rad Inc com-...@... wrote: Have any of you experimented with a RX pre-amp for the Kenwood TKR-750 repeater? Yeah, once or twice... I am seeking results of actual trials of a product - 'bout killed myself once trying a Thighmaster... Anyone care to comment on their experience(s) ? Hurt a lot in the groin area and took a while to heal. Thanks in advance Ed Folta Where and what you do with a preamp should depend on the location, application and duplexer (antenna system). In most casual situations (not a a major comm site with other adjacent repeaters and a broadcast station or two nearby) pretty much any type of decent preamplifier works very well. I like the ARR Preamplifiers because they work well and are often found fairly cheap on Ebay. The old GLB (now owned by someone else) are very good layouts for busy locations. Other people have told you about Angle Linear and I'll throw in both Telewave and Hamtronics as a source. Everyone wants to dance and sing about GasFet and Phempt device preamplifiers but there is more than a valid case around to obtain and use bipolar device versions (preamps) ... And you'll hear lots of opinions about how much gain to use/buy. Depending on whose camp you're in the reply might be that x-amount is enough to not much all the way to the other extreme where as much as you can. And the amount of gain you end up with should again depend on you specific situation. I tend to lean toward the as much as you can side because I like to use mostly hand held on low power portable radios. I can work my 22 mile distant ham repeater from inside my house with less than 1/4 watt of power. So the real answer to your question might be... where ya gonna put the repeater? s.
[Repeater-Builder] Re: Simrex - GLB Pre-Selector Pre-Amplifier
Re: Simrex - GLB Pre-Selector Pre-Amplifier The Simrex (aka GLB) units are actually amplified pre-selector assemblies, not just plain wide-band Receive Pre-Amplifiers. There's a reason why these units offer/spec 8dB Gain versus the others un-protected preamps. The less obvious gain when compared to traditional GasFet and BiPolar RF Preamplifiers is due to the internal integrated pre and post filtering. What does it all mean... If you have some types of IMD grunge problems when trying a regular GasFet/BiPolar Preamplifier, chances are your results using the Simrex/GLB pre-selector might be better. The pre and post filtering inside the Pre-Selector is a big deal. s. Jack Chomley ra...@... wrote: This unit looks like the answer for me..I think! I am in the process of building 2 repeaters on 70cm for possible emergency use by our Amateur Radio Club. Both will be very portable, I have Vertex VX-2200 radios for one, Hamtronics T304/R306 boards for the other. In keeping the units very portable, I am using these filters http://www.polarelectronicindustries.com/model.php/model_id/983/ These filters are being used due to portability, but I have reservations about performance IF my systems end up sited close to other equipment. Would the Simrex unit offer advantages when used with my filters? I would look to getting the higher selectivity spec, in preference to gain. 73, Jack. VK4JRC Sent from my Apple iPad Tablet PC On Jul 30, 2010, at 6:20 AM, Steven M Hodell st...@... wrote: More great info from Frank @ SIMREX. Steve ~ KA1RCI - Original Message - From: Frank Neuperger To: fr...@... Cc: Steven M Hodell ; maqui Mike Aquilino ; sa...@... Sent: Thursday, July 29, 2010 4:15 PM Subject: Re: [Repeater-Builder] Fw: TKR750 -Preamp Steve, That did not post to the list because I don't have membership. I would appreciate if you would forward to the list on my behalf. Regards Frank On 7/29/2010 3:58 PM, Frank Neuperger wrote: Steven, Thanks for the vote of confidence. We sell them to Hams (Ham frequencies) for $275($25 less than 2-way dealers) as a gesture to Gil Boelke (silenet key) who developed the preselector and founded GLB (now owned by SIMREX). Note that the standalone preselector is still made in house by staff that were trained by Gil and on tooling built by Gil. It is also the front end of every SNRDS-II radio. Same radios that are part of many FAA and other Federal systems. Standard gain is 8 db For +$25, you can order it with ~4 dB gain and steeper skirts on the filter or ~11 dB gain and gentler slope on the filter skirts. For extreeme interference, one usage of the preselector has been to place a coax stub notch filter between the antenna and the preselector. I have done ~3MHz spacing of the notches of the comb for a marine radio BASE application using ~ 35?? feet of LMR 400 for my stub. One of the notches was placed directly onto the frequency of collocated marine base station giving us an extra 22dB of suppression at that frequency. Using excessive length of coax resulting in a comb allows the overallbandwidth to repeak steeply and with minimal loss between the notches of the comb. A single notch approach (not a comb) when placed close to your desired carrier will often have unacceptable insertional loss at your desired frequency.The comb notch filter is just extra coax and minimizes the insertion loss close to the notch. . The calcs for length are not too difficult. Warmest Regards Frank Neuperger Simrex Corporation VE3FNZ - Original Message - From: Steven M Hodell To: Repeater-Builder@yahoogroups.com Cc: sa...@... Sent: Thursday, July 29, 2010 2:34 PM Subject: Re: [Repeater-Builder] Fw: TKR750 -Preamp Another very good choice for this application is the GLB Preselector / Preamp from Simrex Corp. I have several of these deployed on 144 / 220 / 440 Amateur repeaters and they all perform very well. They can be tuned to maximize gain or selectivity per your requirements and their support is outstanding. http://www.simrex.com/site/products/special.htm PRESELECTOR PREAMPLIFER Low cost solution to interference, intermodulation and desensitization problems. Helical Resonator Design. Preselector Specifications (pdf 63k) Preselector Example Diagram (pdf 10k)
Re: [Repeater-Builder] Re: TKR-750 RF Preamplifiers
Some man sir..TU Doug On 29/07/2010 22:31:49, skipp025 (skipp...@yahoo.com) wrote: Re: TKR-750 RF Preamplifiers Com/Rad Inc com-...@... wrote: Have any of you experimented with a RX pre-amp for the Kenwood TKR-750 repeater? Yeah, once or twice... I am seeking results of actual trials of a product - 'bout killed myself once trying a Thighmaster... Anyone care to comment on their experience(s) ? Hurt a lot in the groin area and took a while to heal. Thanks in advance Ed Folta Where and what you do with a preamp should depend on the location, application and duplexer (antenna system). In most casual situations (not a a major comm site with other adjacent repeaters and a broadcast station or two nearby) pretty much any type of decent preamplifier works very well. I like the ARR Preamplifiers because they work well and are often found fairly cheap on Ebay. The old GLB (now owned by someone else) are very good layouts for busy locations. Other people have told you about Angle Linear and I'll throw in both Telewave and Hamtronics as a source. Everyone wants to dance and sing about GasFet and Phempt device preamplifiers but there is more than a valid ca
Re: [Repeater-Builder] Fw: TKR750 -Preamp
At 7/29/2010 11:34, you wrote: Another very good choice for this application is the GLB Preselector / Preamp from Simrex Corp. I have several of these deployed on 144 / 220 / 440 Amateur repeaters and they all perform very well. They can be tuned to maximize gain or selectivity per your requirements and their support is outstanding. ...but what is the noise figure? I'm going to ask this every time someone says they perform very well. 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
Re: [Repeater-Builder] Re: Simrex - GLB Pre-Selector Pre-Amplifier
At 7/29/2010 14:59, you wrote: Re: Simrex - GLB Pre-Selector Pre-Amplifier The Simrex (aka GLB) units are actually amplified pre-selector assemblies, not just plain wide-band Receive Pre-Amplifiers. There's a reason why these units offer/spec 8dB Gain versus the others un-protected preamps. The less obvious gain when compared to traditional GasFet and BiPolar RF Preamplifiers is due to the internal integrated pre and post filtering. What does it all mean... If you have some types of IMD grunge problems when trying a regular GasFet/BiPolar Preamplifier, chances are your results using the Simrex/GLB pre-selector might be better. The pre and post filtering inside the Pre-Selector is a big deal. Yes, but the NF is unpublished unknown. I therefore assume it's poor, maybe 3 dB? A Chip Angle GaAsFET @ UHF has 0.5 dB NF. Put a 1/4 wave pass cavity with 0.5 dB loops in front of it you have a narrow 1 dB NF front-end. I'll take 1 dB NF over 3 dB NF any day. The Simrex unit makes a nice solution if you don't have the physical space for a 1/4 wave bottle. Then again, I know someone who just ordered an even smaller MtronPTI front-end crystal filter to solve a front-end overload problem from a TX over 1 MHz away from his RX. Not the best solution (higher loss, can't be retuned if he ever has to change freq.), but I guess it works for him. Bob NO6B
Re: [Repeater-Builder] Re: Simrex - GLB Pre-Selector Pre-Amplifier
On Jul 30, 2010, at 9:31 AM, n...@no6b.com wrote: At 7/29/2010 14:59, you wrote: Re: Simrex - GLB Pre-Selector Pre-Amplifier The Simrex (aka GLB) units are actually amplified pre-selector assemblies, not just plain wide-band Receive Pre-Amplifiers. There's a reason why these units offer/spec 8dB Gain versus the others un-protected preamps. The less obvious gain when compared to traditional GasFet and BiPolar RF Preamplifiers is due to the internal integrated pre and post filtering. What does it all mean... If you have some types of IMD grunge problems when trying a regular GasFet/BiPolar Preamplifier, chances are your results using the Simrex/GLB pre-selector might be better. The pre and post filtering inside the Pre-Selector is a big deal. Yes, but the NF is unpublished unknown. I therefore assume it's poor, maybe 3 dB? A Chip Angle GaAsFET @ UHF has 0.5 dB NF. Put a 1/4 wave pass cavity with 0.5 dB loops in front of it you have a narrow 1 dB NF front-end. I'll take 1 dB NF over 3 dB NF any day. The Simrex unit makes a nice solution if you don't have the physical space for a 1/4 wave bottle. Then again, I know someone who just ordered an even smaller MtronPTI front-end crystal filter to solve a front-end overload problem from a TX over 1 MHz away from his RX. Not the best solution (higher loss, can't be retuned if he ever has to change freq.), but I guess it works for him. Bob NO6B If you picked the UHF Simrex unit with less gain, more selectivity than the standard model, then the noise factor should be better? I guess it comes back to price too, a 1/4 wave can plus pre-amp will cost more money... No such thing as a free lunch :-) 73, Jack VK4JRC
Re: [Repeater-Builder] Fw: TKR750 -Preamp
Hello Doug Pre amplifiers are nifty gadgets. In my email I am seeking some personal references about this particular radio and a pre-amp which may have been tried wioth some level of success. When you start inserting GAIN ahead of a front end you have to be careful of overloading the system and introducing harful side effects. In very densly congested sites ( lots o f transmitters ) you may havdet ocomprimise the sensitivity of the reciever for selectivity. Crystal filter may help - I have found using a receiver with a tight front end and / or sufficient preselection will triumph over trying to make a lesser piece of equipment work. Example a GE Mastr III is a super reciever - In my case I am trying to set up a clients 2 recievers with a little additional sensitivity - we are using this equipment in a remote site away form other forms of interference ( boondock tower site ). Some manufacturers are ARR and EMR - EMR makes a bi-polar amp with variable gain. ARR also has a fixed gain version - ARR was very popular with GaS fet low noise stuff for 800 Mhz - used a lot of them - exccellent results. Costs $100 thru $350 Best r egards Ed Folta Com/Rad INc - Original Message - From: Doug Hutchison To: repeater-builder@yahoogroups.com Sent: Thursday, July 29, 2010 12:30 PM Subject: Re: [Repeater-Builder] Fw: TKR750 -Preamp Where does one obtain these and at what cost? Doug On 29/07/2010 15:58:54, Ken Arck (ah...@ah6le.net) wrote: At 04:30 AM 7/29/2010, Com/Rad Inc wrote: ubject: TKR750 -Preamp Greetings Group Have any of you experimented with a RX pre-amp for the TKR 750 repeater? I am seeking results of actual trials of a product - Anyone care to comment on their experience(s) ? We use AngleLinear PHEMT preamps all the time on TKR- 750's that we sell. They work very well without overloading the front end as many of the higher gain ones on the market do (generally, 12 to 15 dB is all that is needed in a receiver system, not the 20 to 24 dB some preamps deliver. Ken -- President and CTO - Arcom Communications Makers of repeater controllers and accessories. http://www.arcomcontrollers.com/ Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net We don't just make 'em. We use 'em! Yahoo! Groups Links
[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
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] 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
[Repeater-Builder] Re: Simrex - GLB Pre-Selector - Preamp
n...@... wrote: ...but what is the noise figure? I'm going to ask this every time someone says they perform very well. Bob NO6B Depends on the Pre-Selectors Generation and options. The original active device could be one of a few different types. After a period in time a GasFet upgrade was offered as an option. One would have to ask what the current default active device is. If it's not a GasFet I would probably guess they do offer the option. A GasFet or Phempt is not always a desired upgrade. One of the largest US Land-Mobile (two-way) Radio Preamplifier Suppliers specifies mostly a high performance BiPolar Device in their high-level mountain top antenna distribution systems. The Noise Figure is not always the most important specification. s. Another very good choice for this application is the GLB Preselector / Preamp from Simrex Corp. I have several of these deployed on 144/220/440 Amateur repeaters and they all perform very well. They can be tuned to maximize gain or selectivity per your requirements and their support is outstanding.
Re: [Repeater-Builder] Adjusting low power on an R1225 repeater
If you have a spectrum analyzer, be sure and check it for spectral purity. *Most* radios don't like to have their power cut back that far. Scott Scott Zimmerman Amateur Radio Call N3XCC 474 Barnett Road Boswell, PA 15531 Joe wrote: 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 Yahoo! Groups Links
Re: [Repeater-Builder] Re: Simrex - GLB Pre-Selector Pre-Amplifier
At 7/29/2010 16:52, you wrote: Yes, but the NF is unpublished unknown. I therefore assume it's poor, maybe 3 dB? A Chip Angle GaAsFET @ UHF has 0.5 dB NF. Put a 1/4 wave pass cavity with 0.5 dB loops in front of it you have a narrow 1 dB NF front-end. I'll take 1 dB NF over 3 dB NF any day. The Simrex unit makes a nice solution if you don't have the physical space for a 1/4 wave bottle. Then again, I know someone who just ordered an even smaller MtronPTI front-end crystal filter to solve a front-end overload problem from a TX over 1 MHz away from his RX. Not the best solution (higher loss, can't be retuned if he ever has to change freq.), but I guess it works for him. Bob NO6B If you picked the UHF Simrex unit with less gain, more selectivity than the standard model, then the noise factor should be better? I doubt it. But without any real NF numbers, it's all guesswork. I guess it comes back to price too, a 1/4 wave can plus pre-amp will cost more money... GaAsFET preamp is ~$130. I don't think I've ever paid more than $50 for a pass cavity, so the total is ~$100 less than the GLB unit. Bob NO6B
Re: [Repeater-Builder] Re: Simrex - GLB Pre-Selector - Preamp
At 7/29/2010 19:04, you wrote: The Noise Figure is not always the most important specification. s. OK, I have an RFPA for sale that performs very well. And that's all I'm going to say about it. ;) Without a NF spec, it's impossible for an RF system designer to determine if the device is suitable for a particular application. Selectivity isn't everything either. Bob NO6B
RE: [Repeater-Builder] Adjusting low power on an R1225 repeater
Is there an issue running one of those at 25 watts continuous? It is a repeater. What was it's intent if not to be used in a heavy duty cycle? 73, Robert K5ILS _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Joe Sent: Thursday, July 29, 2010 9:06 PM To: Repeater-Builder@yahoogroups.com Subject: 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-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Joe Sent: Thursday, July 29, 2010 6:45 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.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
[Repeater-Builder] FS GE Master II UHF Repeater ready to play
I am selling a GE Mastr II UHF repeater already set up for the Arcom RC210 controller. GE preamp installed and crystaled up for 441.950 with a ts64 board installed. 75 watt PA and it is ready to go. No, this is not a repeater builder built repeater but otherwise is a good condition machine. I am asking $350.00 shipped and payment via PayPal or money order. Brian, 360 239 9757
Re: [Repeater-Builder] Re: 420Mhz Radio for Voter?
I disagree on the price of the CDM's. You can get the CDM-750 (4-channel) for as low as $75 to $125 if you watch for them on e-bay. The CDM-1250 and CDM-1550 are more expensive used, but still you should be able to get them for $250 or less if you just have to have the 128 channels and alpha display. On our setup, I program the RX CDM for PL on receive, but leave it in monitor mode. I then feed the PL detect from the RX radio to the PL encode of the TX CDM. When it gets back to the site, if the radio receives a PL, then it sends the logic out the PL detect pin. If it doesn't, then no logic is sent. This way you can turn the PL tone at all your remote sites locally with your controller. On Thu, Jul 29, 2010 at 3:35 PM, Glenn (Butch) Kanvick hotl...@gmail.comwrote: Hello Tim. I just looked in my storage site and I found a Micor Base/Repeater which is on the band split of 402-430 MHz. I do not have channel elements for it. I know it was working when it came out of service a few years ago, and the PA can be used as a digital station, as it takes the four pin channel elements. It is the complete base repeater which is designed for continious duty as it has the large pa heatsinks. Let me know if you would like pictures of it. I have $200.00 into it and it weighs alot so I am sure shipping via ground would be around $50.00. If you need the cabinet and power supply it would be $400.00 plus actual shipping. Butch, KE7FEL/r On Thu, Jul 29, 2010 at 1:33 PM, Tim - WD6AWP tisaw...@gmail.com wrote: Those CDM radios are a bit pricy at $550 each. But I appreciate the suggestion. And you've given me some ideas. I still like the idea of building an out of band repeater for the remote receive site from a Micor chassis. I would need a 406-420 exciter, bandpass filter and trippler. If anybody on the list has those or can help me find them I'd really appreciate it. --- In Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com, James Adkins adkins.ja...@... wrote: I am using the Motorola CDM series of radios for 420-425 MHz links from voting sites. They make a low-split UHF split that covers 403-470 MHz out of the box, no mods needed. On the transmit sites, you will want to use a fan for cooling. We mount the RX radio and a UHF TX radio on a 1U rack shelf, use a 4 hole saw and drill a hole under the UHF TX radio, and purchase a nice Dayton 24vdc fan that is actually a ball bearing fan that you can count on for years of use, and let it go. Have not had any problems to date with these rigs over a 4 year span. at W6KGBs article on moving 450-470 Mastr IIs to 420-450. It's on the GE Mastr II page at repeater-builder. You could use a Mastr II UHF mobile with the receiver, exciter and IPA converted to 420, then use the receiver in an aux receiver chassis at the voter site. You wouldn't need to convert the PA, the IPA (driver) and a beam would be enough for a point-to-point link. Bob Meister WA1MIK did an article on converting the multiplier chains so that the UHF Micor receivers could hear down as low as 435 MHz (where the front ends run out of tuning range). Mike WA6ILQ At 05:10 PM 07/27/10, you wrote: Thanks Jeff, I'll keep looking around for those low split UHF Micor receivers. What about the transmit side? Maybe I should look for a unified chassis low split UHF repeater. Swap out the UHF receiver for a VHF high band receiver and use that for my remote receiver site. Then use the low split UHF receiver on the other end of the link. That make sense? --- In Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com Repeater-Builder%40yahoogroups.com, Jeff DePolo jd0@ wrote: When you say low split, are you talking about the Motorola TRE1201/TRE8031 406-420 Mhz receivers? I don't have a manual in front of me, but yes, 406-420 receivers, they'll work fine well into the mid 430's without mods. What Canadian sources might have these? Well, Spantek comes to mind as a dealer. CW Wolfe used to get a lot of stuff out of Canada, but I haven't talked to Bud in quite a few years, not sure if he's still in business. This list is probably the best resource. eBay as an alternative. If you get desperate I still have a few dozen low-split Micors in the warehouse, but really don't have the time (or patience) to deal with packing and shipping radios for what few dollars I'd get out of them (i.e. value of my time $value of radio). But if you just wanted a receiver, you can consider me a last resort if you strike out everywhere else... --- Jeff WN3A --- In Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com Repeater-Builder%40yahoogroups.com
RE: [Repeater-Builder] GE Mobile Radio
Charlie, This is a tough one. The Y prefix indicates an RCC duplex radio, and the ER42M and ET59L indicate a Mastr Progress Line 35 watt radio for the 450-470 MHz band. I wonder if the 80 you quoted might actually be 88? Better double-check the Combination Number to make sure you're reading it correctly. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of glad3933 Sent: Thursday, July 29, 2010 7:44 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] GE Mobile Radio Hi I have an old GE mobile trunk mounting type radio with a control head and can't find any info on the radio. The only numbers are on the front of the radio as follows: YT55TPU80 serial number 2120935 er-42-m FCC DATA ET 59 L. On the front of the radio is a large chrome handle the width of the radio and folds out of the way to allow access to the front of the radio and the cable connectors. I suppose the handle is for carring the radio when it would be removed for service or repair. I think the radio might be a UHF unit. Any help would be appreciated. Thanks Charlie.
RE: [Repeater-Builder] Adjusting low power on an R1225 repeater
Robert, The R1225 was never intended to be used in a heavy duty application. When marketed in its GR1225 desktop configuration, it was presented as a light-duty, local-area repeater for construction sites and similar low duty-cycle applications. Since the GR1225 included a temperature-controlled fan, Motorola suggested that the power be set to 25 watts when heavy use was expected. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Robert McNeill Sent: Thursday, July 29, 2010 8:12 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Adjusting low power on an R1225 repeater Is there an issue running one of those at 25 watts continuous? It is a repeater. What was its intent if not to be used in a heavy duty cycle? 73, Robert K5ILS From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Joe Sent: Thursday, July 29, 2010 9:06 PM To: Repeater-Builder@yahoogroups.com Subject: 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-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Joe Sent: Thursday, July 29, 2010 6:45 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.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] Repeater transmit levels at the receiver?
Hi guys, Took some time away from the project... loosing too many hairs. Ok, I've gotten another receiver strip, and it has the specified sensitivity per Mot. Guess I want to bounce some ideas around with those of you who are more learned in the arts! With 250mW (+24dBm) into the transmit port... antenna port is a quality 50 ohm load, I see -72dBM at the receiver port. (pretty much what I expect.. 1.8dB loss through the xmit side, 100dB notch through the RX side. With it all hooked up receiving an input signal of about 0.7uV, application of the 250mw to the transmitter side will cause noise in the receiver, although not much. So, it appears that if I add an additional 30dB notch (another 'can'), the problem at high power may go away. If I compare what 50 watts with an additional can would be (-130dB) to what I get with 250mW current notch (100dB), then it looks like I just need to add an additional can. 50 w = +47dBm - 130dB future notch = -83dBm at receiver. 250mw = +24 - 100dB current notch = -76dBm With the current notch @ 50 watts, I see a receive signal of -53dBm. Some have said that the Micor can handle that, while others (off-line) have said no way. This setup appears to support the opinion that -53 is still way too much. Any comments and thoughts would be most appreciated! Thanks, Tim
Re: [Repeater-Builder] Re: 420Mhz Radio for Voter?
What's it take to program those radios? -- Tim :wq On Jul 29, 2010, at 8:45 PM, James Adkins wrote: I disagree on the price of the CDM's. You can get the CDM-750 (4-channel) for as low as $75 to $125 if you watch for them on e-bay. The CDM-1250 and CDM-1550 are more expensive used, but still you should be able to get them for $250 or less if you just have to have the 128 channels and alpha display. On our setup, I program the RX CDM for PL on receive, but leave it in monitor mode. I then feed the PL detect from the RX radio to the PL encode of the TX CDM. When it gets back to the site, if the radio receives a PL, then it sends the logic out the PL detect pin. If it doesn't, then no logic is sent. This way you can turn the PL tone at all your remote sites locally with your controller. On Thu, Jul 29, 2010 at 3:35 PM, Glenn (Butch) Kanvick hotl...@gmail.com wrote: Hello Tim. I just looked in my storage site and I found a Micor Base/Repeater which is on the band split of 402-430 MHz. I do not have channel elements for it. I know it was working when it came out of service a few years ago, and the PA can be used as a digital station, as it takes the four pin channel elements. It is the complete base repeater which is designed for continious duty as it has the large pa heatsinks. Let me know if you would like pictures of it. I have $200.00 into it and it weighs alot so I am sure shipping via ground would be around $50.00. If you need the cabinet and power supply it would be $400.00 plus actual shipping. Butch, KE7FEL/r On Thu, Jul 29, 2010 at 1:33 PM, Tim - WD6AWP tisaw...@gmail.com wrote: Those CDM radios are a bit pricy at $550 each. But I appreciate the suggestion. And you've given me some ideas. I still like the idea of building an out of band repeater for the remote receive site from a Micor chassis. I would need a 406-420 exciter, bandpass filter and trippler. If anybody on the list has those or can help me find them I'd really appreciate it. --- In Repeater-Builder@yahoogroups.com, James Adkins adkins.ja...@... wrote: I am using the Motorola CDM series of radios for 420-425 MHz links from voting sites. They make a low-split UHF split that covers 403-470 MHz out of the box, no mods needed. On the transmit sites, you will want to use a fan for cooling. We mount the RX radio and a UHF TX radio on a 1U rack shelf, use a 4 hole saw and drill a hole under the UHF TX radio, and purchase a nice Dayton 24vdc fan that is actually a ball bearing fan that you can count on for years of use, and let it go. Have not had any problems to date with these rigs over a 4 year span. at W6KGBs article on moving 450-470 Mastr IIs to 420-450. It's on the GE Mastr II page at repeater-builder. You could use a Mastr II UHF mobile with the receiver, exciter and IPA converted to 420, then use the receiver in an aux receiver chassis at the voter site. You wouldn't need to convert the PA, the IPA (driver) and a beam would be enough for a point-to-point link. Bob Meister WA1MIK did an article on converting the multiplier chains so that the UHF Micor receivers could hear down as low as 435 MHz (where the front ends run out of tuning range). Mike WA6ILQ At 05:10 PM 07/27/10, you wrote: Thanks Jeff, I'll keep looking around for those low split UHF Micor receivers. What about the transmit side? Maybe I should look for a unified chassis low split UHF repeater. Swap out the UHF receiver for a VHF high band receiver and use that for my remote receiver site. Then use the low split UHF receiver on the other end of the link. That make sense? --- In Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com, Jeff DePolo jd0@ wrote: When you say low split, are you talking about the Motorola TRE1201/TRE8031 406-420 Mhz receivers? I don't have a manual in front of me, but yes, 406-420 receivers, they'll work fine well into the mid 430's without mods. What Canadian sources might have these? Well, Spantek comes to mind as a dealer. CW Wolfe used to get a lot of stuff out of Canada, but I haven't talked to Bud in quite a few years, not sure if he's still in business. This list is probably the best resource. eBay as an alternative. If you get desperate I still have a few dozen low-split Micors in the warehouse, but really don't have the time (or patience) to deal with packing and shipping radios for what few dollars I'd get out of them (i.e. value of my time $value of radio). But if you just wanted a receiver, you can consider me a last resort if you strike out everywhere else... --- Jeff WN3A --- In Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com
[Repeater-Builder] Re: Measure return loss and cable fault with HP 8924C
See page five for an explanation of the process... http://206.209.106.106/datasheets/Miscellaneous/54100a-4.pdf Again, doable, but messy. Lee --- In Repeater-Builder@yahoogroups.com, Dickson dicksonf...@... wrote: Hi, Thanks for your info. Though a bit complicated, it is still doable. By the way, how to measure the cable fault location without the 11807 software? Thanks and Regards, Dickson Fu VR2WHF --- In Repeater-Builder@yahoogroups.com, ve7fet yahoogroups@ wrote: First you'll need a return loss bridge. No replacing that. The 11807 software can make things a little prettier, but you can still do return loss quite easily. Distance to fault is going to be a bit more challenge, but it can be done too. Return loss is the easiest to set up. You'll need to set up the tracking generator/spectrum analyzer for the range you want to measure. Use the Duplex Output and connect it to the Source port on the RLB. Use the Antenna Input and connect it to the Reflected port on the RLB. You optionally may want to put a 6dB pad in between the Duplex Out and RLB Source port. With the DUT port open on the RLB, you should have a trace on the spectrum analyzer over the range you are sweeping. Now, you can turn up the output power of the Duplex Port until the trace gets close to the reference level at the top, or go into the menus on the spectrum analyzer and do a Save A and then a A-B to null out the sweep. Now, when you put a good load on the DUT port, you should get a return loss down ~40dB or so. Hook up the DUT you want to sweep and go. Yes, this is quick and dirty, but it gets the job done when you are not looking for fractions of a dB... Lee --- In Repeater-Builder@yahoogroups.com, Dickson dicksonfuhk@ wrote: Hi all, Without the RF Tools provided by 11807E opt 100 on HP 8924C, how to measure return loss and cable fault? The 11807E opt 100 provides the IBASIC program that can show the return loss profile over the range of frequency and indicates the max/min return loss and the corresponding frequency. Thanks and Regards, Dickson Fu VR2WHF
Re: [Repeater-Builder] Re: 420Mhz Radio for Voter?
Any windows PC with a serial port, an aftermarket or real Motorola cable and software. On Thu, Jul 29, 2010 at 11:05 PM, Tim Sawyer tisaw...@gmail.com wrote: What's it take to program those radios? -- Tim :wq On Jul 29, 2010, at 8:45 PM, James Adkins wrote: I disagree on the price of the CDM's. You can get the CDM-750 (4-channel) for as low as $75 to $125 if you watch for them on e-bay. The CDM-1250 and CDM-1550 are more expensive used, but still you should be able to get them for $250 or less if you just have to have the 128 channels and alpha display. On our setup, I program the RX CDM for PL on receive, but leave it in monitor mode. I then feed the PL detect from the RX radio to the PL encode of the TX CDM. When it gets back to the site, if the radio receives a PL, then it sends the logic out the PL detect pin. If it doesn't, then no logic is sent. This way you can turn the PL tone at all your remote sites locally with your controller. On Thu, Jul 29, 2010 at 3:35 PM, Glenn (Butch) Kanvick hotl...@gmail.comwrote: Hello Tim. I just looked in my storage site and I found a Micor Base/Repeater which is on the band split of 402-430 MHz. I do not have channel elements for it. I know it was working when it came out of service a few years ago, and the PA can be used as a digital station, as it takes the four pin channel elements. It is the complete base repeater which is designed for continious duty as it has the large pa heatsinks. Let me know if you would like pictures of it. I have $200.00 into it and it weighs alot so I am sure shipping via ground would be around $50.00. If you need the cabinet and power supply it would be $400.00 plus actual shipping. Butch, KE7FEL/r On Thu, Jul 29, 2010 at 1:33 PM, Tim - WD6AWP tisaw...@gmail.comwrote: Those CDM radios are a bit pricy at $550 each. But I appreciate the suggestion. And you've given me some ideas. I still like the idea of building an out of band repeater for the remote receive site from a Micor chassis. I would need a 406-420 exciter, bandpass filter and trippler. If anybody on the list has those or can help me find them I'd really appreciate it. --- In Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com, James Adkins adkins.ja...@... wrote: I am using the Motorola CDM series of radios for 420-425 MHz links from voting sites. They make a low-split UHF split that covers 403-470 MHz out of the box, no mods needed. On the transmit sites, you will want to use a fan for cooling. We mount the RX radio and a UHF TX radio on a 1U rack shelf, use a 4 hole saw and drill a hole under the UHF TX radio, and purchase a nice Dayton 24vdc fan that is actually a ball bearing fan that you can count on for years of use, and let it go. Have not had any problems to date with these rigs over a 4 year span. at W6KGBs article on moving 450-470 Mastr IIs to 420-450. It's on the GE Mastr II page at repeater-builder. You could use a Mastr II UHF mobile with the receiver, exciter and IPA converted to 420, then use the receiver in an aux receiver chassis at the voter site. You wouldn't need to convert the PA, the IPA (driver) and a beam would be enough for a point-to-point link. Bob Meister WA1MIK did an article on converting the multiplier chains so that the UHF Micor receivers could hear down as low as 435 MHz (where the front ends run out of tuning range). Mike WA6ILQ At 05:10 PM 07/27/10, you wrote: Thanks Jeff, I'll keep looking around for those low split UHF Micor receivers. What about the transmit side? Maybe I should look for a unified chassis low split UHF repeater. Swap out the UHF receiver for a VHF high band receiver and use that for my remote receiver site. Then use the low split UHF receiver on the other end of the link. That make sense? --- In Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com Repeater-Builder%40yahoogroups.com, Jeff DePolo jd0@ wrote: When you say low split, are you talking about the Motorola TRE1201/TRE8031 406-420 Mhz receivers? I don't have a manual in front of me, but yes, 406-420 receivers, they'll work fine well into the mid 430's without mods. What Canadian sources might have these? Well, Spantek comes to mind as a dealer. CW Wolfe used to get a lot of stuff out of Canada, but I haven't talked to Bud in quite a few years, not sure if he's still in business. This list is probably the best resource. eBay as an alternative. If you get desperate I still have a few dozen low-split Micors in the warehouse, but really don't have the time (or patience) to deal with packing and shipping radios for what few dollars I'd get out of them (i.e. value of my time $value of radio). But if you just wanted a receiver, you can consider
[Repeater-Builder] OT- Dispatcher injured by lightning strike
A dispatcher was treated for electrical shock on May 2 after lightning sent a power surge through the dispatcher's headset. http://richmondregister.com/localnews/x1255109983/Lightning-surge-injure\ s-911-dispatcher http://richmondregister.com/localnews/x1255109983/Lightning-surge-injur\ es-911-dispatcher
[Repeater-Builder] Re: Digest Number 7357
I never saw the highly modified HT-200 of Dick's but I have heard stories of the infamous Drinkie-Talkie (as I heard it referred by) from Neil WA6KLA several times over the years. I remember that Dick's 2m repeater was great to use and listen to in the Mid 70's on my trips into the LA area. Joe - WA7JAW One toy of his that I saw only at SAROC was the hip flask he built from an intrinsically safe HT200 case (complete with collapsed Dixie cups stashed in the battery compartment). It looked like a stock radio until he popped the top cap off of the antenna and poured out the beverage.
