[Repeater-Builder] Kenwood TK 730 as a repeater
Wonder if I could get some quick comments on the feasibility of using two Kenwood TK 730 mobiles as a 2 meter repeater. Not sure if KW actually has has that configuation as a product. I realize that low power would have to be used.. I have a friend in a old club I used to belong to ask met the question and I am not familiar with the radio.. I have built several repeaters out of Exect two with good results. I would be worried about the receiver front end and over all selectivity for 600 kc spacing. Any thought would be appreciated. Send to [EMAIL PROTECTED] Thanks Dale K0Jxi
RE: [Repeater-Builder] Kenwood TK 730 as a repeater
Dale, The 730 is a very nice and narrow front-end radio with big helical to tune. It will work better than you think. If you are playing around with the low power model 35wt radio. You will want to run it no more than 10wt and add a 24v fan to cool the heat sink. We have used the 35wt UHF in some IFB configurations for years and they have been keyed down for a sum of 10+ years and have never gave any sins of weakness. I know they are not designed for continious operation but they built a very good radio. The newer version, the TK-790 is a much better radio if you can find one. When I first got into radio back in the 90s. the company I first worked for had a 3ch UHF LTR system built out of the low power units turned down to 10wt and then into an amp. Mike Mullarkey (K7PFJ) _ From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of k0jxi Sent: Saturday, January 19, 2008 7:02 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Kenwood TK 730 as a repeater Wonder if I could get some quick comments on the feasibility of using two Kenwood TK 730 mobiles as a 2 meter repeater. Not sure if KW actually has has that configuation as a product. I realize that low power would have to be used.. I have a friend in a old club I used to belong to ask met the question and I am not familiar with the radio.. I have built several repeaters out of Exect two with good results. I would be worried about the receiver front end and over all selectivity for 600 kc spacing. Any thought would be appreciated. Send to [EMAIL PROTECTED] mailto:dwmcgraw%40bellsouth.net net Thanks Dale K0Jxi
[Repeater-Builder] Amateur repeater ID's
Can anyone point me to the specific enforcement case or warning letter where the FCC first said that regular, periodic repeater ID's irrespective of repeater usage were broadcasting and had to stop? The FCC's online archives don't seem to go back far enough (seems to me it was in the 80's), and all the references that DID turn up dealt with specific interference cases, not the broadcasting issue. A news item in a QST or CQ column would be sufficient... Thanks. George, KA3HSW / WQGJ413
Re: [Repeater-Builder] Amateur repeater ID's
I can't give you a case, but the reason is because it would be a beacon which is not allowed on the repeater bands. (although many repeaters do that) Joe M. George Henry wrote: Can anyone point me to the specific enforcement case or warning letter where the FCC first said that regular, periodic repeater ID's irrespective of repeater usage were broadcasting and had to stop? The FCC's online archives don't seem to go back far enough (seems to me it was in the 80's), and all the references that DID turn up dealt with specific interference cases, not the broadcasting issue. A news item in a QST or CQ column would be sufficient... Thanks. George, KA3HSW / WQGJ413 Yahoo! Groups Links
RE: [Repeater-Builder] Re: Micor power supply issue
Eric, Use a known-good digital multimeter to verify that the AC power at the power supply is 120 +/- 6 VAC. It is not uncommon for remote sites to have abnormally low voltages. Some heavily-loaded power supplies will start to collapse at much less than their rated output, if the AC input voltage falls much below 114 VAC. Please advise what model number power supply (TPN) is being used. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of kk2ed Sent: Thursday, January 17, 2008 9:40 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Micor power supply issue Let me clarify a little bit I am using the supply to power the Micor repeater as well as a GM300 link transceiver. A few weeks ago I started to notice a slight hum on the link radio's transmitted signal. Now, the hum is so bad, and voltage drop significant, that the GM300's transmit signal is dirty and sounds like a spurious emitter when transmitting. If I disable the main repeater TX (Micor), so as to lessen the load and only have the GM300 transmitting, the hum goes away. Being the GM300 only uses the 13.8v output, I'm guessing the other outputs are ok. I forgot to mention - When I stopped at the site the other day, I heard the transformer buzzing, which increased in loudness when the repeater was keyed (thus placing a heavier load on the transformer). Possible transformer or resonant circuit capacitor failure? I will be stopping at the site in the morning to investigate further and swap it out with a spare. I'll report back with my findings later tomorrow. Thanks Eric KE2D --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com , Eric Grabowski [EMAIL PROTECTED] wrote: While I don't have experience with that particular power supply, the situation you describe is symptomatic of filter capacitor failure. The capacitor's equivalent series resistance (ESR) becomes so high that it doesn't filter the ac ripple anymore. You should be able to verify this easily by using a scope to observe the ac ripple on the dc output under various load conditions. Eric KH6CQ --- kk2ed [EMAIL PROTECTED] wrote: Good Evening, I have a Micor 75 station power supply that is acting up. When the repeater is idle, the voltage output appears clean. But as the load is increased (ie: power output increased), the voltage sags and I get an annoying hum on the tx (indicative of AC ripple on the dc side?). It started out as a barely noticeable hum; the past few days it has gotten to the point where I just shut down the repeater's tx. I haven't had a chance to get to the site to swap it out with a spare. But I'm curious as to what kind of repair I'm in for, and others' experience with Micor supplies. What tends to be the failure and/or cause of the above condition? Pass transistor failure? Filter caps? Ferro-resonant circuit (cap)? Thanks for any input Eric KE2D __ ___ Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs http://www.yahoo.com/r/hs
Re: [Repeater-Builder] Re: Micor power supply issue
At 08:01 PM 1/18/2008, you wrote: Well it looks like the problem is with the 15,000uf caps. Two of them appear to have leaked a brown substance. The power supply is a TPN 1110A (or something close - it's still in my truck). ---FWIW, I had a Quintron power supply (also a ferro-resonant design) develop some serious 120 cycle a few years back and it turned out to be a faulty diode bridge. Oh, and its transformer has been singing for years, before AND after. 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!
[Repeater-Builder] Wanted: Low Power Mobile
I am seeking a Maxtrac, Radius, GM300, type radio UHF, LOW power, (2 watts)mobile radio. Originally sold for low power industrial channels. Lance N2HBA
Re: [Repeater-Builder] Amateur repeater ID's
At 1/19/2008 10:47, you wrote: Can anyone point me to the specific enforcement case or warning letter where the FCC first said that regular, periodic repeater ID's irrespective of repeater usage were broadcasting and had to stop? The FCC's online archives I received such a warning letter back around the mid-80's. I'm sure I still have it somewhere but can't dig it up right now. The text of the Notice of Station Operating Conditions was along the lines of my repeater sent its callsign when no communications was taking place, that the repeater shall only ID in accordance with Part 97.xxx. The notice was prompted by numerous complaints to the FCC sent by users of my repeater as well as a co-channelled repeater, each claiming interference from the other repeater. Bob NO6B
RE: [Repeater-Builder] Wanted: Low Power Mobile
Have what you want Maxtrac 16 Channel 450-470 UHF. 2 waltts Tho run a pair at 5 watts with no problem, Contact me off list. New unit no mike or power cord AB6WU - Original Message - From: Captainlance To: Repeater-Builder@yahoogroups.com Sent: 1/19/2008 1:10:09 PM Subject: [Repeater-Builder] Wanted: Low Power Mobile I am seeking a Maxtrac, Radius, GM300, type radio UHF, LOW power, (2 watts)mobile radio. Originally sold for low power industrial channels. Lance N2HBA
[Repeater-Builder] Re: Micor power supply issue
Re: Micor power supply issue Micor Power Supplies should be dirt cheap on the surplus radio market. In some cases a few two-way shops would probably give you a replacement used supply. I know of a surplus store here in California with a number of new in the box Micor Power Supplies for sale cheap. But the shipping would kill the good price. You can replace the filter caps easy enough... The replacements can don't have to be exact values... Be advised that used, surplus and New Old Stock Capacitors can be tired, problematic and should probably be pretested for proper operation. Someone with a Sencore LC-102 or similar type analyzer is handy to know. As always, sometimes a real deal isn't... cheers, s. RIP: HSC Electronics in Sacramento, CA - Closed Jan 19, 2008 @5pm kk2ed [EMAIL PROTECTED] wrote: Well it looks like the problem is with the 15,000uf caps. Two of them appear to have leaked a brown substance. The power supply is a TPN 1110A (or something close - it's still in my truck). Has anyone found a suitable replacement caps for these supplies, or am I better of junking it and buying another unit? Eric KE2D --- In Repeater-Builder@yahoogroups.com, Mike Morris WA6ILQ wa6ilq@ wrote: At 09:39 PM 01/17/08, you wrote: Let me clarify a little bit I am using the supply to power the Micor repeater as well as a GM300 link transceiver. A few weeks ago I started to notice a slight hum on the link radio's transmitted signal. Now, the hum is so bad, and voltage drop significant, that the GM300's transmit signal is dirty and sounds like a spurious emitter when transmitting. If I disable the main repeater TX (Micor), so as to lessen the load and only have the GM300 transmitting, the hum goes away. Being the GM300 only uses the 13.8v output, I'm guessing the other outputs are ok. I forgot to mention - When I stopped at the site the other day, I heard the transformer buzzing, which increased in loudness when the repeater was keyed (thus placing a heavier load on the transformer). Possible transformer or resonant circuit capacitor failure? I will be stopping at the site in the morning to investigate further and swap it out with a spare. I'll report back with my findings later tomorrow. Thanks Eric KE2D --- In Repeater-Builder@yahoogroups.com, Eric Grabowski ejgrabowski@ wrote: While I don't have experience with that particular power supply, the situation you describe is symptomatic of filter capacitor failure. The capacitor's equivalent series resistance (ESR) becomes so high that it doesn't filter the ac ripple anymore. You should be able to verify this easily by using a scope to observe the ac ripple on the dc output under various load conditions. Eric KH6CQ --- kk2ed kk2ed@ wrote: Good Evening, I have a Micor 75 station power supply that is acting up. When the repeater is idle, the voltage output appears clean. But as the load is increased (ie: power output increased), the voltage sags and I get an annoying hum on the tx (indicative of AC ripple on the dc side?). It started out as a barely noticeable hum; the past few days it has gotten to the point where I just shut down the repeater's tx. I haven't had a chance to get to the site to swap it out with a spare. But I'm curious as to what kind of repair I'm in for, and others' experience with Micor supplies. What tends to be the failure and/or cause of the above condition? Pass transistor failure? Filter caps? Ferro-resonant circuit (cap)? Thanks for any input Eric KE2D I'll bet it's the resonant capacitor, but as long as you are in there you will want to look at every electrolytic. Mike WA6ILQ
Re: [Repeater-Builder] Amateur repeater ID's
Well, that at least confirms the time frame I thought it was in one step closer, anyway. - Original Message - From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Saturday, January 19, 2008 3:58 PM Subject: Re: [Repeater-Builder] Amateur repeater ID's At 1/19/2008 10:47, you wrote: Can anyone point me to the specific enforcement case or warning letter where the FCC first said that regular, periodic repeater ID's irrespective of repeater usage were broadcasting and had to stop? The FCC's online archives I received such a warning letter back around the mid-80's. I'm sure I still have it somewhere but can't dig it up right now. The text of the Notice of Station Operating Conditions was along the lines of my repeater sent its callsign when no communications was taking place, that the repeater shall only ID in accordance with Part 97.xxx. The notice was prompted by numerous complaints to the FCC sent by users of my repeater as well as a co-channelled repeater, each claiming interference from the other repeater. Bob NO6B
[Repeater-Builder] Re: Amateur repeater ID's
The most recent case posted on the FCC's Amateur Radio enforcement actions web site is this one: http://www.fcc.gov/eb/AmateurActions/files/BEDNA07_05_25_1078.pdf --- In Repeater-Builder@yahoogroups.com, George Henry [EMAIL PROTECTED] wrote: Can anyone point me to the specific enforcement case or warning letter where the FCC first said that regular, periodic repeater ID's irrespective of repeater usage were broadcasting and had to stop? The FCC's online archives don't seem to go back far enough (seems to me it was in the 80's), and all the references that DID turn up dealt with specific interference cases, not the broadcasting issue. A news item in a QST or CQ column would be sufficient... Thanks. George, KA3HSW / WQGJ413
Re: [Repeater-Builder] Motorola radios on ham
15 years ago I was handed a UHF MT1000 that covered 438-470 in one range. It was a big upgrade from an HT220. It had GMRS, business, public safety and amateur channels in it. No crystals or reeds required. You can pick up the same 99 channel radio today, on ebay, for under $75. The 16 channel ones go for less. The high band 146-172 model stretches down to 144 very nicely. The low band 42-50 covers Red Cross channels at 47mhz and 6m ham very nicely. Sorry, you can't listen to the California Highway Patrol on 42mhz very well. I'd call that kind of performance per dollar spent very ham friendly. In fact, I have a total of 5 MT100s to my name. BTW until I can pick up SDH series Jedis those 99 channel MT1000s are my current portables. The only thing the Jedi will give me is coverage of 440 mhz amateur up through the LA County Sheriffs (talk and listen at 482mhz), expansion from 99 to 160 channels, and a slightly lighter / smaller radio. The high band one will give me amateur, CAP, business, public safety and some RPU channels all in the same radio. The disadvantages of the Jedis is that I have to acquire a couple of new chargers, some new batteries, new speakermics, and a new MVA. Mike WA6ILQ At 07:26 AM 01/18/08, you wrote: Buying A$TRO radios is not an acceptable answer. As for the Spectras, I've had no problem with a UHF Spectra going to 440 and 470. The only thing I hate about them is the primitive CSQ channel priority. Even in the commercial world, that is ridiculous. Try using it on a channel that has an LTR system on it. You will never hear any other channels. The Maxtrac would go several MHz out of band without issue. Try doing that with a CDM. I know of nobody who has gotten one to do 449.9875 and 470.0125 in one radio. Joe M. [EMAIL PROTECTED] wrote: On Tue, 15 Jan 2008 14:23:58 -0500, MCH [EMAIL PROTECTED] wrote: Motorola has become very ham unfriendly anymore. I would suggest becoming more friendly with Motorola's product line. You now have XTS and XTL radios that cover VHF as 136-174 or UHF as 380-470 and require no software range mods. The ASTRO Spectra line had been the worst for 440 support, or starting VHF R2 at 148MHz though software moded to 146-ish. That's definitely no longer the case with the XTL line. Very ham friendly in my opinion. Yahoo! Groups Links
