Re: [Repeater-Builder] Micor UHF Sensivity
Stuff to try: 1. Verify that the LO multiplier chain is peaked correctly. I've seen a bunch of these that exhibit this symptom that had mistuned LO chains. 2. Feed the test signal into the RX directly. If you see good sensitivity, you know where to looks ;-) 3. Take each of the bottom cover shields off in order and clean the tabs. Put them back on and run a small screwdriver tip every 1/8 or so shorting the can to its ground. If you see an improvement get out an iron and solder it. I don't like doing this, but I haven't found an alternative that works. On 9/6/2010 12:11 PM, Tim Sawyer wrote: I have a Micor base that was manufactured in the ham band. Model is C64RXB3196A-SP71. The receiver model number is TRE1241A-SP10 (420-450 Mhz). It came with 4 channels all tuned up and on frequency in the ham band. But the receiver is sensitivity is .72 mv for 20 db quieting on the best channel and .9 on the worst. I went through the alignment procedure and could not make any improvement. Obviously this is not meeting the .5 spec and I was expecting more like .3 or so. So my questions is what should I do to troubleshoot this? Is there some common Micor receiver failure parts or areas that I should be looking into? -- Tim -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] DB212-3
On 8/30/2010 2:08 PM, Chuck Kelsey wrote: Doug, what were the State Police using for mobile radios back when you were involved? I'm finding that the newer, wider front end, radios don't hear as well as the old 0.5-1 MHz wide receivers did. I can hit my 6-meter repeater full quieting, yet sometimes can hardly hear it due to mobile environment noise that you can't avoid driving past (computers, LAN equipment, etc., etc.) Chuck WB2EDV I'll bet 99-44/100% of this is the lack of an effective noise blanker. I was running a LB SyntorX 9000 at the peak of the last cycle and it ran rings around everything else. It ran FULL band 10 and 6. Bench sensitivity of all the radios were pretty close, but the moto mobile noise blankers were a major ( 10 dB) advantage. I'll bet those 'old' radios have good noise blankers. -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] DB212-3
Most of this is true, but good noise blankers only operate on impulse noise. More to my point is that noise blankers were a big factor in my observation, therefore the dominant problem still appears to be impulse noise. In a similar vein, many of the newer, inexpensive small wide band Low VHF radios have foregone noise blankers entirely. There is no question that there has been a rise in the urban noise floor at all frequencies. Computers and networks are a major contributor. But like any other radio source, path loss is a reality and when operating mobile other vehicles have the proximity advantage. The fact also remains that even if you presume that FE bandwidth is a factor, it's only likely a 15 or so dB factor with respect to broadband noise - and that's only.Adjacent vehicles on the road have a lot more impact than that, probably starting at 30+ dB. Oz On 8/30/2010 4:36 PM, Paul Plack wrote: Noise blankers also target broadband noise. If some computer is dumping right on your intended receive frequency, you're out of luck. 73, Paul, AE4KR - Original Message - *From:* Chuck Kelsey mailto:wb2...@roadrunner.com *To:* Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com *Sent:* Monday, August 30, 2010 3:10 PM *Subject:* Re: [Repeater-Builder] DB212-3 The radio I'm using in the mobile is a GE Orion with a noise blanker. However, a noise blanker is designed to help with impulse-type noise. Microprocessor hash and similar noise sources are continuous, so I doubt a blanker is very effective. The problem, in my mind, is the huge increase in this type of noise compared to 20 or 30 years ago. Chuck WB2EDV - Original Message - *From:* Oz-in-DFW mailto:li...@ozindfw.net *To:* Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com *Sent:* Monday, August 30, 2010 5:00 PM *Subject:* Re: [Repeater-Builder] DB212-3 On 8/30/2010 2:08 PM, Chuck Kelsey wrote: Doug, what were the State Police using for mobile radios back when you were involved? I'm finding that the newer, wider front end, radios don't hear as well as the old 0.5-1 MHz wide receivers did. I can hit my 6-meter repeater full quieting, yet sometimes can hardly hear it due to mobile environment noise that you can't avoid driving past (computers, LAN equipment, etc., etc.) Chuck WB2EDV I'll bet 99-44/100% of this is the lack of an effective noise blanker. I was running a LB SyntorX 9000 at the peak of the last cycle and it ran rings around everything else. It ran FULL band 10 and 6. Bench sensitivity of all the radios were pretty close, but the moto mobile noise blankers were a major ( 10 dB) advantage. I'll bet those 'old' radios have good noise blankers. -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport) -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] dumb question: what is purpose of lock on Mitrek?
No, the CH751 is different, but the MRCA was the same as the Kelvinator refrigerator for years. Bill Hudson wrote: I didn’t know that RCA shared the CH751 key with the Cabinet key for Motorola Outdoor cabinets. This could be an error. Bill Hudson W6CBS -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Motorola style rack speed nuts and screws
All of the compa racks I've seen used spring seel stampings from Tinnerman. You might think they are crappy, but they are inherently vibration resistant. What I think you might be thinking of are cage nuts: http://www.cablesandkits.com/rack-mount-cage-nuts-with-screws-1032-qty-100-p-1120.html The subject says it all but I'm looking for a source for stainless speednuts and screws such as the ones that came with CompaStation racks. (looking for around 50 sets) The usual sources (like HomeDepot and various hardware chains) only have the crappy ferrous spring steel types. 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! __._, -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Polyphaser Question
Polyphasers have a shunt protection element. It usually fails and becomes leaky so you get a loss/VSWR indication. It can fail open or short. If it's open, there is nothing to detect. On 8/17/2010 2:02 PM, Michael Ryan wrote: Chuck, Thanks for that...wouldn't still pass RF if they are blown will they? - m *From:* Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] *On Behalf Of *Chuck Kelsey *Sent:* Tuesday, August 17, 2010 11:51 AM *To:* Repeater-Builder@yahoogroups.com *Subject:* Re: [Repeater-Builder] Polyphaser Question If you are buying used, buyer beware. They could be shot. Chuck WB2EDV -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Polyphaser Question
Yup, huge variation by application. Some gas tubes, some MOVs, some resonant stuff. This stuff has a finite life. They have some pretty information on their site: http://www.protectiongroup.com/knowledgebase On 8/17/2010 7:14 PM, WA3GIN wrote: The units are probably different depending on whether they are HF, VHF, UHF, or 2.4Ghz, etc. - Original Message - *From:* Chuck Kelsey mailto:wb2...@roadrunner.com *To:* Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com *Sent:* Tuesday, August 17, 2010 4:58 PM *Subject:* Re: [Repeater-Builder] Polyphaser Question Wasn't there a capacitor too? Seems like there was in one I saw open. Chuck WB2EDV - Original Message - *From:* David Jordan mailto:wa3...@comcast.net *To:* Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com *Sent:* Tuesday, August 17, 2010 4:44 PM *Subject:* RE: [Repeater-Builder] Polyphaser Question I recently opened up a Polyphaser unit we used on one of our remote sites... it covered both 2m and 70cm. We were experiencing poor receive at the site. Replaced the unit and receiver sensitivity is once again hot. Anyone want pics of the insides respond direct and I'll ship you the photos...not much to see... a gas tube and what looks like a surface mount resistor in series with the gas tube. 73, Dave Wa3gin -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Can a KLN 6210A vibrasender be substituted for a KLN 6209A vibrasponder?
Sorry, maybe. It's heavily application dependent. While senders *tend* to be higher level lower loss devices, that difference diminished over time. On some newer devices it seemed like the only difference was the label. The very alst applicaitons before Motorola caved adn went all electronic used one device type in all applications. Late Mitrek PL boards are an example. On 8/10/2010 6:20 AM, Captainlance wrote: *Sorry, NO. A sender will not work as a sponder. * - Original Message - *From:* Eric Lemmon mailto:wb6...@verizon.net *To:* Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com *Sent:* Monday, August 09, 2010 9:13 PM *Subject:* RE: [Repeater-Builder] Can a KLN 6210A vibrasender be substituted for a KLN 6209A vibrasponder? Brian, Yes, probably. The coils have different impedances, and the armatures have different masses, but they are close enough that in most cases they are interchangeable. That said, Motorola did make them different for a reason- most likely that one was more sensitive as a vibrasponder, and the other worked better as a vibrasender. I recommend that you use the specified part for optimum performance. 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 Brian J. Henry Sent: Monday, August 09, 2010 11:34 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] Can a KLN 6210A vibrasender be substituted for a KLN 6209A vibrasponder? I have an MSR 2000 repeater that I want to change the PL frequency on. Does anyone know if a KLN 6210A vibrasender will work in place of a KLN 6209A vibrasponder on the MSR 2000 PL board? Curiously, Brian Henry, WB6QED -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Mystery Micor problem
I've seen this exact situation after a unit was moved. It's probably even more likely when both parts are from the same vendor. I've seen it with quick turn parts from ICM, too. I don't know if it's caused by mechanical stress from aging, or the addition of contaminant mass to the quartz stirred up by the move. On 8/8/2010 3:23 PM, n3ssl wrote: Hi Group, I have a Micor mobile set up as repeater. Worked great and was on frequency for over 8 years no problems.(lost rpt site May 2010) and have a new site to get on.The problem i am having is the TX drifted 5 khz up on TX from 145.310 to 145.315. I get plenty of deviation and audio drive and 9.6 v to crystal element. I am not having any luck messing with Netting adjustment i get -200 hz max. I also have a UHF Rx unit for control installed and it is 10khz low on frequency. The 144.710 RX crystal is right on the money for specs. Very odd situation. anyone have ideas where to check or a fluke the crystals are both bad. Ryan n3ssl -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Repeater transmit levels at the receiver?
On 7/30/2010 10:15 AM, Kevin Custer wrote: Tim wrote: Hi Kevin, Thanks for the info. I've used the PLL MastrII exciter on a couple of systems also. Now, since this duplexer is of the 'notch' variety, I already have about 100db of notch (on the TX side) that is tuned to the RX freq. Shouldn't this be enough? Yes, 100 dB of duplexer isolation should be plenty - something is obviously a amiss. How dirty is the transmitter (spectral purity)? I'd also look for other signal paths, leaky jumpers, ground loops, poor shielding... -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
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] Re: Base station coax connector weatherproofing recommendations?
On 7/28/2010 11:21 PM, ve7fet wrote: 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. Which is why I use Scotch 70 Self-Fusing Silicone Rubber Electrical Tape (or it's equivalent.) Pricier, but more rugged and UV resistant. Self vulcanizing and peels clean when slit. No glue, but turns into a solid mass a few days after activated by stretching. -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] 420Mhz Radio for Voter?
And even the 88 split Mastr/MVP stuff works fine with minimal modification at 420. Most of it just tunes, thouhg you need to add some padding to get stuff the peak in a few cases. On 7/27/2010 1:17 PM, Jeff DePolo 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 -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Re: Base station coax connector weatherproofing recommendations?
--- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com, jland138 jland...@... wrote: Any recommendations or best practices on weatherproofing the coax connection to a base station antenna? I use a layer of self vulcanizing silicone tape stretched and overlapped to spec. This is then covered with with two layers of Scotch 88 stretched to spec and overlapped half it's wide. Absolutely clean, uncreased and unwrinkled wraps are essential. A lot of people use a coating of Scotchkote, but I've not seen the value. The beauty of this is that every joint I've done this way has been clean and dry when I've cut it open 10 days or 10 years later it peels clean and is clean and dry. I've had installs in Texas, on the coast, on Colorado mountain tops, and on platforms at sea. It just works. The weak point is that the 88 drys out after a while, but is still good for 10 years of hard UV exposure if properly applied (50% overlap, appropriate stretch, and a no-stretch 2 turn finish on clean tape. The Comtelco XL (or horrors! Antenex FG) series both have a drain system at the base that need to remain open. Is it as simple as some coax seal and avoid plugging the drain holes? Coax seal is messy and make maintenance a rectal trauma (at best) or impossible. Any recommendations on using heat shrink at the cable end of the coax connector? Does it help, or does it eventually wind up as a moisture reservoir? The adhesive bearing shrink is the only real option here. POS (plain old shrink) will eventually wick moisture. You need to make sure that whatever you use remains flexible after shrinking, if not it will leak. -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Anybody have a clue ?
On 7/25/2010 2:37 PM, Mike Morris wrote: Photo here: www.repeater-builder.com/wa6ilq/Motorola-S-1350-C-WATT-METER-with-500W-500-1000-MHZ.jpg Anybody know who made the watt meter in the photo for Moto ? I believe this was a Motorola fabricated item. It was also used with several generations of their service monitors and in some high power base stations as a sensing element. I believe the basic design was done by the Government Equipment Group (division) in Phoenix. Did that company market it under their own name? Motorola ;-) The HT220 switch handle on the right side is the forward-reverse selector switch. Did Moto actually use that know/handle as a stock item? Or has someone along the line lost the original knob? Dunno. Mike WA6ILQ -- mailto:o...@ozindfw.net Oz - N1OZ POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Repeater transmit levels at the receiver?
On 7/23/2010 10:34 AM, tahrens301 wrote: Hi folks, Still working on the hardline duplexer for 6 meters, and have some data I'd like to run by you guys. Running 80 watts out of a Micor tx into the TX bank of cavities. With test equipment, get about 100dB notch. (shows 50 watts into dummy load as well).. have about 1.5 - 2dB loss through them. Ok, now I hook the spectrum analyzer up to the receiver port, and I see about -55dBm. 50 watts = +47dBm, minus the 100dB notch = -53dBm that is pretty close to what I'm seeing at the rx antenna port. This should be good enough. You probably want the TX freq well below -30 dBm or so.TX noise should be notched to at least 10 db below the noise floor at the RX frequency. IF the TX is a Micor or MASTRII of any stripe, 100 dB at teh RX frequency ought to be fine with margin. Question is: Should this good enough for a low band micor receiver? Thanks, Tim W5FN -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Re: question for commercial radio shops
On 7/13/2010 10:20 PM, tracomm wrote: Didn't one of the large radio dealers recently get a hefty fine for programming radios on frequencies that the user did not have a license for ?? CJD There are several examples of this. Not recent (15 os years ago?) a shop renting radios to a movie crew programmed them in the ham band. When contacted about this by local hams, the movie group and the rental shop both said buzz off. When the FCC stepped in, the movie set said they are licensed and pointed at the shop. **BOTH** were provided show cause letters and subsequently fined. It's not only the programmer of the radios that risks fines and other action from the FCC. -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Silver Plating - Cheap Easy
On 7/14/2010 6:37 AM, N1BUG wrote: JG wrote: Good fishing !!, or is your memory that good:) I poked Ham Radio magazine into Google and found a few articles on silver plating in this list: http://webhome.idirect.com/~griffith/hr/hrind05.htm Safe, Sensible Silverplating ... that rings a bell! That is the one I was thinking of. Feb 1985. Hmm. My guess of mid 1980s wasn't too far off the mark. Now if only I knew what I did yesterday. :-) Now, here's the Million Dollar question.. where are these articles archived ?? Nowhere that I know of. ARRL sells the complete archive on CD. $60 http://www.arrl.org/shop/Ham-Radio-CD-ROM-1984-1990/ -- mailto:o...@ozindfw.netOz POB 93167 Southlake, TX 76092 (Near DFW Airport) Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) * To change settings via email: repeater-builder-dig...@yahoogroups.com repeater-builder-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: repeater-builder-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: Silver Plating - Cheap Easy
On 7/14/2010 11:06 AM, dwmcg...@bellsouth.net wrote: I read a few of the posts about silver plating and can tell there are not many of the old build it your self 2/432 high power amp builders left around. I was used to plate cavities and tank circuits. The is a silver plating power that one can buy and it is called Cool AMP. Was originally designed for plating contacts on high current electrical connectors to reduce heating by cutting down contact resistance. Worked great. Easy to use. It is a slightly gritty powder that is applied with a damp cloth. Use it like spit polishing your old military black shoes. Works good for small and medium size areas. I have used it to touch up the main pass cavity tuning rods. coupling loops and also plating circuit for general coating and maintain solderability. About do years ago I bought two jars at 35 a jar. Jard are bout threee inches tall and two inches wide. Goes a long way if you use it right. Great stuff to fool the Cops to make them thing you have some drugs-- Hi. Easy, not cheap. http://www.cool-amp.com/prices_order.html *Cool-Amp Prices:* (#1233-500) 16oz = $166.00ea 8oz = $91.50 ea 4oz = $57.50 ea 2oz = $31.50ea -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
[Repeater-Builder] Re: RogerBeep (Quindar)
http://www.hq.nasa.gov/alsj/quindar.html On 7/13/2010 10:02 PM, ka9qjg wrote: Meant a lot to the First Astronauts with Communications that is how it got started I think , I forget if it was a Pre or after Transmission Don KA9QJG -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Re: Silver plating of cavities advice please?
Silver plating can have an impressive positive performance effect under some circumstances. It's also at advantage because it's corrosion result is conductive, so performance is not effected by tarnishing. -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Re: Silver plating of cavities advice please?
On 7/11/2010 11:46 AM, Oz-in-DFW wrote: Silver plating can have an impressive positive performance effect under some circumstances. It's also at advantage because it's corrosion result is conductive, so performance is not effected by tarnishing. -- mailto:o...@ozindfw.net mailto:oz%40ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport) _ Hit the *(^$% send button too fast. If the manufacturer didn't bother to plate them, I wouldn't either. -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
[Repeater-Builder] FTAGH: Micor Squelch Gate TLN4662A2
FTAGH = Free To A Good Home Pickup in DFW or ship in Small USPS Flatrate box for $5 to US, or for fixed rate by destination internationally. http://www.usps.com/prices/priority-mail-prices.htm or internationally: http://ircalc.usps.gov/ -- mailto:li...@ozindfw.netOz POB 93167 Southlake, TX 76092 (Near DFW Airport)
[Repeater-Builder] TAKEN: Micor Squelch Gate TLN4662A2
It's yours. Drop me a note off list. On 7/6/2010 6:40 AM, Stan wrote: I will take it if you still have it. Stan *From:* Oz-in-DFW mailto:li...@ozindfw.net *Sent:* Tuesday, July 06, 2010 7:34 AM *To:* Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com *Subject:* [Repeater-Builder] FTAGH: Micor Squelch Gate TLN4662A2 FTAGH = Free To A Good Home Pickup in DFW or ship in Small USPS Flatrate box for $5 to US, or for fixed rate by destination internationally. http://www.usps.com/prices/priority-mail-prices.htm http://www.usps.com/prices/priority-mail-prices.htm or internationally: http://ircalc.usps.gov/ http://ircalc.usps.gov/ -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Proto boards
Or: http://www.wa5vjb.com/products4.html 6.5 by 4.25 Large Proto Board $5 3.75 by 2.75 Small Proto Board $3 Kent is also a source of economical built-to-spec preamps. -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] help and suggestions interference issues
On 7/4/2010 11:25 AM, terry_wx3m wrote: DSTAR is totally foreign to me. I can't think of anyone in the immediate area that even has a DSTAR capable radio. We are experiencing some interference on the input to one of our club repeaters. What baffles me is that the repeater is in PL (123.0). Is it possible that a DSTAR user in a neighboring area is inadvertently transmitting PL and getting into our machine? Also it would GREATLY help if someone had the capability of making me a short .wav clip of what DSTAR sounds like on an analog receiver. Thanks Terry wx3m.te...@gmail.com mailto:wx3m.terry%40gmail.com DStar doesn't use CTCSS (PL) and even if it did you would not 'hear' anything on an analog radio. If your problem really involves DStar, what /could/ happen is: 1. A DStar signal with enough energy in the 123 hz decoder to trip the radio (not too likely I think.) 2. A mix that involves a DStar radio and an analog radio running CTCSS (what I would bet on.) What makes you think a DStar radio is the interference source? -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
[Repeater-Builder] Re: Death of a Service Monitor
On 7/3/2010 7:13 AM, Brian wrote: You must remember, that the average IQ is 100. Of course that means that half the population of the world has an IQ below 100. Think about that when you are on the freeway or voting!:-) You've also got to remember that many corporations require equipment to be destroyed rather than sold. Often it's because the items are fully written off and selling would constitute a profit that costs more to account for than it would return. It is particularly true of the original manufacturer who has taken items on trade and has (IMNSHO) an irrational fear of old product competing with current production. -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Re: Harmful Taxing
On 6/25/2010 1:44 PM, skipp025 wrote: Kevin. ZL1KFM spar...@... wrote: Plan was to build 3 remote RX sites and feed it back to the main site (4th RX) and expand the coverage. However our MED (Your FCC) decided to charge for every repeater in the country, this included Amateur repeaters. Tax revenue crazy Governments don't realize how much damage their plain greed does to innovation, education, creativity and growth. s. Not just governments. The Texas VHF FM society is considering a nominal per-repeater coordination fee. While there are some possible benefits, I opined that this was a BAD IDEA for a number of reasons. Rich, N1OZ -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
[Repeater-Builder] Free to good home: VHF MSR2000 Manual
68P81061E50-A Covers 132-174 RF and options for A rev GRB and GSB models. Pick up in DFW or pay postage. -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Need source for UHF power module
I have a number of M57729L which are 400-420. The H is 450-470. These hybrid parts lose gain pretty rapidly outside the spec'd range but will make power over quite a wide range. The L will make spec up to 430 or so an have full power capability at reduced gain to almost 440. Probably not an answer for you. On 5/24/2010 7:45 PM, Yahoo wrote: The item is still available from pacparts.com. I would recommend checking the price from an Icom dealer. Part # SC-1056 Jeff *From:* Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] *On Behalf Of *x.tait.tech get real *Sent:* Saturday, May 22, 2010 2:34 PM *To:* Repeater-Builder@yahoogroups.com *Subject:* Re: [Repeater-Builder] Need source for UHF power module there is a company here in New Zealand that used to or maybe still does deal with Kenwood products http://www.pacificaerials.co.nz/ http://www.pacificaerials.co.nz/ I know of no one else, other than Kenwood themselves Marcus On Sat, May 22, 2010 at 5:02 PM, byronhham hellewe...@utahwisp.com mailto:hellewe...@utahwisp.com wrote: Hi Does anyone know of a good source for a M57729h-01-p. It is the UHF power module in the Kenwood TKR-820. It is rated at 30 Watts 12 volts 440 to 470 MHz. I found that they do not like to be operated into the wrong side of a duplexer. For even a short time. Is it used in any other transceivers that might be purchased for the module? Thanks Byron NJ7J -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Commercial VHF antenna on 2m
Dave, You're probably right that the new location probably makes up for a lot. Have you been able to confirm that the antenna still works up at it's rated freqs? How much feedline loss are you dealing with? Most 'good' sites have significant feed line runs and therefore loss. While I haven't spotted where you indicated this, it sounds like a tower site. Feedline loss improves your apparent match by twice the loss of the feedline. 2:1 is 9.5 db return loss. If you have 3 dB of feedline loss, that's a 6 dB improvement and the RL at the antenna is 3.5 dB (~5:1) this might expalin why you can't stub tune it out. One of your earlier posts indicates that this is a PD-220-3A. This is a collinear with a beamwidth of 18 degrees. It's low enough gain where the beam tilt out of band isn't likely to be a factor. The up (or down) tilt of a collinear is dependent on frequency. At UHF and 800 with high gain antennas this can be a real factor. You can get great match but put all of your energy into the ground (or into space.) It's also a reason that a lot of antennas don't work well upside down. This is a real problem with high gain collinear wireless LAN antennas. N1OZ -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Kenwood TK-630S Low Band for Rpt. use?
On 4/29/2010 8:34 AM, wd8chl wrote: I don't recommend them for repeater use though. The transmitter won't handle continuous duty at full power even with a fan, and it's iffy at lower power. The rx is good, but it has a somewhat broad front end. Not to mention the capabilities of that radio make it much better suited to mobile use. With up to 160 channels, PC programmable, decent scan, etc, it just seems a waste to tie it up on one channel all the time. Let alone tie up two. Look for something like a MastrII. They go up well, are cheap, and easy to interface to. Pick up a UHF mobile as well and it's about the easiest way to put up a 6M repeater there is. or a SyntorX (Not X9000) synthesized, EEPROM programmable. will do 100 W key down with lots of air, or lower power with some air. Cheap as MastrII at hamfests and no need for rocks. . -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Re: Pager Interference Revisited
Yes, but odds are good you are dealing with three different problems - similar mechanisms but different participants. Unless of course you can hear it at all three sites on the same frequency. On 4/24/2010 1:48 PM, Mike Besemer (WM4B) wrote: Given that the interference is in three different repeaters over about 40 air-miles, I have not done that. I've THOUGHT about it, but it didn't make sense, give the circumstances. 73, Mike WM4B -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Re: Pager Interference Revisited
Mike, I'm coming to this late, but I have comments and questions. What type of hardware are the paging transmitters? What are the repeaters in question, and what type of duplexers, feedline, and antennas are used? On 4/24/2010 3:42 PM, Mike Besemer (WM4B) wrote: Not sure what you mean by 'come and go'. It's there when the pager transmitter is up, gone when it's not. In another message you implied it sweeps across multiple repeater inputs. It also comes and goes with heat and sun... we may have days with no interference if it's cool and cloudy or just plain cold. Rain makes no difference. We saw the same thing with Radio Shack and Winegard active TV antennas on RVs. The problem was a high band pager and our UHF radio inputs. Nothing remarkable about the audio... sounds like clean, clear paging tones. Never heard anything else. This implies a first order contribution to a mix or spur. If the second or third harmonic of the pager was involved, the deviation would be a suitable multiple and should sound distorted. Might be good to ask him what transmit dev. he runs, or measure it. There is an abundance of TV stations, DTV, translators, AM, FM... you name it. Yeah but this sounds like something flying. If mixes sweep across your input one contributor is almost always an amplifier that is oscillating. The two frequencies you mention would require a channel 37 station and those don't exist in the US. The paging signals are both, depending on which site it's coming from. Eh? what do you mean here? I can get my hands on pretty much anything I need. Spectrum analyzer is no problem. I have a good 'connection'. Did some hunting with a spectrum analyzer last year to no avail, but now that I have the ability to call the system and have it send out a page we have a little better advantage. Is the paging system key down, or is it transmit on demand? Can you hear the interference far from your site (several miles?) The ability to DF it sort of implies this. I'd call the area 'populated', but not 'urban'. Mostly housing around the site, but plenty of industry (and towers) visible from the top of the water tank. (We are, by the way, the only user on the tank.) What kind of sites are the paging transmitters on? Rental tower, water tank, building? -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] M67709SH Mitsubishi Module
I've got quite a few MHW720A2 on hand. These are in a very similar if not identical package. They are 20W 440-470 Mhz parts. Data sheet is: http://www.n5ebw.com/downloads/MHW720A2.pdf On 4/19/2010 3:23 PM, Tom Parker wrote: Sorry, I guess I should have been clearer. It's no longer available from RF Parts and the like. It's obsolete. Both are drivers in Johnson Viking PA's, frequency range dependent. Also, I was wondering if there was a Toshiba replacement that someone was aware of. Thanks Kevin, thp kevin valentino wrote: www.rfparts.com http://www.rfparts.com --- On *Mon, 4/19/10, Tom Parker /t...@ntin.net/* wrote: From: Tom Parker t...@ntin.net Subject: [Repeater-Builder] M67709SH Mitsubishi Module To: Repeater-Builder@yahoogroups.com Date: Monday, April 19, 2010, 3:55 PM Anyone know of a source, or have any M67709SH or M67709 Mitsubishi RF Modules? Thanks, Tom Parker -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Low Band Micor mobile not making power
How much current is it pulling? At 53.7 I suspect you are well into the roll off on the output low pass filter. I forget exactly how it's implemented in this case. On 3/18/2010 9:06 AM, tahrens301 wrote: Hi all, Working on a micor mobile to be used as a repeater (only using the exciter/control board/PA). Was going through it, and am only able to get about 75 watts out of it with the exciter on 53.7. The exciter is putting out 0.3 watts... a bit more than most exciters I've seen, but they were high band. The tags on the PA cover indicate over 100 watts were once measured. Made most of the capacitor mods to the exciter, but it tunes up easy. (slugs not in wierd places). Oh, not gonna run it at full power, but wanted to make sure it was up to snuff. Thanks, Tim W5FN -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Re: 200 watts on a repeater transmitter - was something else...
On 3/8/2010 2:33 PM, Kevin Custer wrote: Steve wrote: It seems logical that if a rptr tx is running 200w, and the mobile is running say 50w then it is going to be one way ie mobile hears rptr but rptr don't hear mobile too well Common misconception. Lets say the mobile radio has a receive sensitivity of -116 dBm and 50 watts of transmitter power. The repeater has a receive sensitivity of -122 dBm - how much power will it take to balance out the receive advantage of the repeater? If you said 6 dB, you are correct. 50 watts with a 6 dB improvement is 200 watts. I have seen several VHF and UHF repeater systems with -125 dBm actual sensitivity on air - connected to the antenna and duplexing. You do the math... 400 watts is the answer. The original poster mentioned an LDG voter and remote links. If the repeater has remote receivers that will increase the distance of operation from the transmitter, he'll need all of his 200 watts. Kevin Custer And a /properly /configured voter can easily add 4-6 dB to efffective sensitivity just though diversity effects, never mind getting the receiver closer to the user. -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] LOOONG audio runs
On 2/27/2010 4:53 PM, Joe wrote: Oz, in DFW wrote: Make sure you use twisted pair. Station wire like that use to wire houses is often not twisted. Ethernet cable is good and has a high twist pitch - better for this application. I wonder if CAT 6 would be better than CAT5 due to the difference in twist? Joe I'm not sure it will matter much. Mostly I think a tight twist will provide better isolation at the higher frequencies. Cross connect and some multipair telephone cable can have as little as two twists per foot. This is an appreciable portion of a wavelength at UHF and is likely to offer lower common mode value. The twist rates of CAT5 and CAT6 are high enough that I suspect they are substantially similar in this application. Oz, in DFW -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] LOOONG audio runs
I vigorously second Jeff's recommendation. This is an application where iron is still the right answer. Make sure you use twisted pair. Station wire like that use to wire houses is often not twisted. Ethernet cable is good and has a high twist pitch - better for this application. Repeat coils are the classic answer. Here's a hint about what you are looking for if you don't already know: http://users.snip.net/~mrbibbs/gearpix/Western_Electric_Repeat_Coils_4040.jpg http://users.snip.net/~mrbibbs/gearpix/Western_Electric_Repeat_Coils_4042.jpg http://oldphoneguy.net/Coils1.jpg Jensen's stuff is really nice, but you'd be paying a premium price for performance you can't use. If you can't find an old set of repeat coils, most small audio transformers with reasonable turns ratios will do the job fine. Reasonable in this case is probably less than 4 or 5:1, though 1:1 would be best. I'm not sure where you are, but if you can't find anything easily, the coupling transformers out of **OLD** modems (1200 Baud or less) are likely suspects. On 2/27/2010 10:32 AM, Jeff DePolo wrote: I'd definately go balanced, but I'd use transformers rather than active balanced devices. Decent transformers (even audiofile-grade Jensens) would still cost less than Henry matchboxes (or anyone else's active converters most likely), and be more reliable. Back in the old days, Western Electric 111C repeating coils were supplied by the telco for program audio lines. Look around broadcast transmitter sites and old studios, you'll probably find a few nailed up to the telco backboard that the LEC no longer has an interest in maintaining ownership of... The common mode rejection of Henry matchboxes isn't all that great, I've tested them. If you can, keep the audio level high on the sending side (I think 111C's were good up to close to a watt at 600 ohms!), and pad it down on the far side's secondary as necessary to maximize S/N. --- Jeff WN3A -- mailto:o...@ozindfw.net Rich Osman N1OZ POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Remote Receiver site
GE MVPs are the best answer I've found hands down. Swap a VHF RX in a UHF frame. You can use a MastrII or ExecII for the TX site and it's all very neat. Even cooler - MastrII RX and TX's convert to 220 pretty easily. While the conversion is not for the faint of heart, 220 links are cool. On 1/7/2010 9:26 PM, John Szwarc wrote: I'm looking for some advice on constructing a remote receiver site. Ideally I'd like to have everything contained in one neat package just like at the repeater site. We'd be receiving on VHF and transmitting the link signal on UHF back to the repeater site.Any thoughts? -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Repeater Rebuild Project Input
From the information you've provided I'm look hard at a Motorola R1225 or a pair of GM300s. The diamond will certialy lower your SWR, but so will a 50 ohm dummy load. Low SWR isn't the only concern any more than antenna gain is. It's likely the Diamond will work, but these ham market antennas have notoriously short lives in full duplex operation. There are exceptions that have been in service a long time, but a large percentage get annual changes. I'd also look hard at a local water tank if you want reliable coverage. ;-) On 1/8/2010 2:08 AM, phantom1071 wrote: Hello All, I am looking to rebuild a 70cm repeater with an output within the ham band. We currently have a non-tunable fiberglass comercial band antenna wich is giving us a SWR of about 2:1. The first piece of advice we are looking for is recomendations for replacing the antena. There are some conciderations to go with this. Since it is a privately owned repeater it is in a back yard and not mounted very high due to lack of an antenna tower or space to put one up on the property. The antenna will be mounted at about 20 feet from ground level and we are looking to maximize coverage area so we are looking at high gain antennas such as the Diamond F718 which would be a step up as it would lower our SWR. What are your thoughts with this antenna or recomendations on other high gain antennas for the 70cm band? Also, we are looking to replace the repeater itself. Right now we have an old Kenwood business band repeater that has been modified to work in the ham band but it is becoming more unstable as time progresses. We want to keep the equipment as back up and would like to look into a new system. We want something that is computer programable if possible. It also should work with an external controller as we are using a CAT-1000 with an attached weather station and CAT weather radio reciever. Right now we are coordinated at 25 watts output but would like to have a repeater that could run 50 watts continuous. Also, we would like to stay away from D-STAR simply because of personal preferance. Any suggestions or reccomendations for the repeater unit? Thanks for your help! Andrew KB8UPB ___ -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Service Monitor Input Protection
I have a 30 dB 250 W pad that I use with radios that put out over 50 Watts. My HP8921 will handle that without problem. It'd work with the 2.5W case. I don't remove it for sensitivity checks as I can compensate for it in the 8921. Most service monitors modern enough to have been designed for cell phones (those with 10 W inputs) can do this. It's not always obvious how to do it, but they can. The IFR1900CSA I had could as well. A relay is going to have to be awfully fast to do what you want to. At worst, use a 20 dB pad as a fuse and move the decimal point in your head when checking sensitivity. On 1/5/2010 4:30 PM, James wrote: Hello to the group. Knowing most of you have service monitors for the Repeater Builder Hobby, I wanted to pose the following question. What method do you use to protect the input of your service monitor from excessive RF Power input? I am referring to the input/output jack that is limited to 2.5 watts on MANY service monitors. I know I can use an attenuator, but that gets removed for sensitivity checks and may not get put back on. One suggestion is a RF Relay that would trip on say one watt and put the power to a dummy load. The problem is I have used one of the cheap circuits in the past and toasted transistors in a Pre-amp, before the relay reacted as the book said it should. However I know there are circuits in say the Mirage Amp that also has a Pre-Amp that is removed from the antenna during transmit, that works well. What are you doing to protect your monitor? Appreciate your thoughts. 73 JIM KA2AJH -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] 220 repeater
I bought several at hamfests over the last few years. None were used, all were new-old stock from failed 220 trunking systems. I still have one BNIB on the shelf next to a BSR220 for a one of these days project. Still need to spot or build an antenna. Also have a 5 channel combiner. They are out there. On 1/2/2010 2:18 AM, K5IN wrote: Good evening, Your e-mail brings up one question: used duplexers for 220 where? Brian - Original Message - *From:* Oz-in-DFW mailto:li...@ozindfw.net *To:* Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com *Sent:* Friday, January 01, 2010 9:40 PM *Subject:* Re: [Repeater-Builder] 220 repeater Micor conversions work very well, but are rather involved. MVP/Exec/Mastr II conversions are much easier and work as well. The MVP package works out really well. Both the Motorola and GE radios rely on a different PA. Most use a hybrid brick to get power. I have several of these I've been getting $25/ea for. WA5VJB did a nice interface board for them. There are also a number of Kyodo/Nokia BSR 220 radios out there. I sold a bunch of them, but I don't think I have any more. Might have one. They are almost as good as the Moto/GE option and are synthesized. An EPROM sets the operating channels. I have docs if you need them. There are a lot of surplus duplexers and combiners floating around from failed 220 trunking systems. Keep an eye peeled. DB built a short vhf high split duplexer that's a snap to convert to 220. If you find a narrow spaced six can dupe on a channel above 160 Mhz that is about 12 or 14 tall, it's probably one of these. Oz -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] 220 repeater
Micor conversions work very well, but are rather involved. MVP/Exec/Mastr II conversions are much easier and work as well. The MVP package works out really well. Both the Motorola and GE radios rely on a different PA. Most use a hybrid brick to get power. I have several of these I've been getting $25/ea for. WA5VJB did a nice interface board for them. There are also a number of Kyodo/Nokia BSR 220 radios out there. I sold a bunch of them, but I don't think I have any more. Might have one. They are almost as good as the Moto/GE option and are synthesized. An EPROM sets the operating channels. I have docs if you need them. There are a lot of surplus duplexers and combiners floating around from failed 220 trunking systems. Keep an eye peeled. DB built a short vhf high split duplexer that's a snap to convert to 220. If you find a narrow spaced six can dupe on a channel above 160 Mhz that is about 12 or 14 tall, it's probably one of these. Oz On 1/1/2010 10:32 PM, Dan Blasberg wrote: All right folks, For those that run a 220 repeater, what are you running as far as the machine itself? A local group is looking to put a 220 MHz repeater on the air and would like some ideas. Thanks, Dan KA8YPY -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
[Repeater-Builder] Re: Syntor / MCX100 Proms
I finally got everything dug out. I have 10 sets to spare. What I have are sealed Motorola RPX-4460A kits that include a single Signetics 82S129N which is Motorola Part Number 51-83625M26 Paypal with shipping address to the reply email address on this note, or certified funds after an email confirmation exchnage to the address in the .sig. Before I do any of this I feel bound to point you here: http://www.brinkleyelectronics.com/adp/adp_fr.htm This is a $20 EEPROM replacement for the bipolar parts. Oz At 09:06 AM 12/6/2009, you wrote: I have a box of the correct parts in Motorola packages I'll sell for $8 each including postage to the US. Kris Kirby wrote: I have a VHF Syntor and a few UHF MCX100s. I'm looking into purchasing PROMs to program them with. The UHF MCXs had the knob-stop removed and it now turns to all 16 positions, however the Syntor is bare and may be strapped for a single frequency. Jameco lists the N82S129 (256x4) for $11, and the N82S131 (512x4) for $8. Can I buy the larger one (cheaper one) and fill it with FFs or 00s and have the radio operate correctly? Since they are PROMs, I only have one shot per device, and I'd like to keep this a cheap project. ;-) -- Kris Kirby, KE4AHR Disinformation Analyst -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
[Repeater-Builder] TAKEN: FTAGH: Motorola PURC 5000 350W 900 Mhz and RX Shelf - FOB Dallas/Fort Worth
Taken Oz-in-DFW wrote: Oh, and the RX shelf is a just a PURC link RX shelf, band and condition unknown. I believe it's actually a MICOR RF deck Oz-in-DFW wrote: FTAGH = Free to a Good Home This is a project I'll never get to. Pickup in Southlake, or I can strap it to a pallet and drop it off an a truck terminal. I'll be driving to Denver before Christmas and to San Antonio afterwards. I can haul it and you can meet me _/on my schedule - on the road /_and pick it up. -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Syntor/MCX100 Prom question
I have a box of the correct parts in Motorola packages I'll sell for $8 each including postage to the US. Kris Kirby wrote: I have a VHF Syntor and a few UHF MCX100s. I'm looking into purchasing PROMs to program them with. The UHF MCXs had the knob-stop removed and it now turns to all 16 positions, however the Syntor is bare and may be strapped for a single frequency. Jameco lists the N82S129 (256x4) for $11, and the N82S131 (512x4) for $8. Can I buy the larger one (cheaper one) and fill it with FFs or 00s and have the radio operate correctly? Since they are PROMs, I only have one shot per device, and I'd like to keep this a cheap project. ;-) -- Kris Kirby, KE4AHR Disinformation Analyst -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] R1225 Question
The two I own and almost every other one I have seen power up on channel one. I've seen one version of the RSS (that may have been hacked) that lets you select the power on default channel. N1OZ Joe wrote: Thanks to the two of you. My problem is that this particular R1225 is programmed for 2 different repeater frequencies and two power levels, so that all 4 modes are programmed. I keep it this way so that it can be used as a backup repeater for either of my UHF repeaters. My concern is that removing the head may make it go to some other mode than mode 1. I'll look into the option lines and see if I can switch (or lock) modes without using the control head. This would give me a little peace of mind that I won't burn things out. Reprogramming just mode 1 would fix it, but I'm trying not to have to do that. 73, Joe, K1ike Oz, in DFW wrote: I believe that you can also program accessory connector option lines as channel select inputs. This will let you select channels without a control head. Eric Lemmon wrote: Joe, The control head is needed only to change modes in local control, listen to the incoming audio, and for programming. Since a repeater only needs one channel, just ensure that channel 1 is active. 73, Eric Lemmon WB6FLY -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] UHF Mastr II PA - SLOW
The power control pots on these are notorious for going flakey. Chuck Kelsey wrote: In addition to checking the solder joints on the transistors, check the connection between the PA output and the harmonic filter. This is another prone intermittent point. Chuck WB2EDV - Original Message - From: Adam Feuer feu...@optonline.net mailto:feuera%40optonline.net To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Monday, November 23, 2009 6:27 PM Subject: [Repeater-Builder] UHF Mastr II PA - SLOW Hello All, I have on the bench into a dummy load an exceptionally clean Mastr II 100 watt UHF PA. It appears to be a late model version because it has the Z-Match board right above the RF output connector. -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Best coax for marine use
One fellow down the reply list sent you the Belden marine pamphlet, give that man a prize. The short answer is the biggest **flexible** cable you can manage. But there are other considerations just as important; 1) Supporting the weight of cable. Clamp it at the top and bottom. Don't expect the connectors to support it. 2) Make sure it's not going to thrash around inside the mast. It will destroy the finish and the mast will rot from the inside out invisibly. One way to do this is support the cable from the bottom and let it 'Pile up lightly inside the mast. This can be tricky because you want it tight enough to avoid rubbing. On one friend's boat we cut some plastic washers that looked like big external tooth lock washers. The coax, radar control cable, and mast light power went in the center hole and the outside was deformed to hold the whole assembly in place. These were installed every two feet by pushing them in place with a piece of PVC pipe (actually several pieces daisy chained.) The external notches insured air circulation and water drainage. . 3) Make sure that all water can drain. Don't wedge the cable with a piece of foam in a way that lets water collect. 4) Tape all connections with lots of overlap. I prefer to use self vulcanizing silicon rubber tape. Done properly, your metal parts will be *bright* after 20 years of exposure. If it's exposed to UV, put two layers of Scotch 88T over the silicon stuff that gets replaced every few years. A tape source: http://www.harmancorp.com/products/hightemperaturepaintmasks/siliconetape.aspx $8.80 for 12 yards X 1 Stretch it to twice it's length and wrap to cover the green center stripe. This stuff it tapered with a thick center and very thin edge. It will reliably cover and seal almost anything in one pass. Vernon Densler wrote: I have been in a big discussion with the guys on my boat list about the right coax for running up the mast for VHF marine radio. Keeping in mind that we are talking about a 70’ or so run going up the center of an aluminum mast, in a salt water environment, and the radio is limited to 25 watts. Also keep in mind that when off shore this is a life line and the best possible send and receive is needed in an emergency situation. So given the criteria what is the best possible coax to use knowing that thickness matters and bend radiuses may be tight? Others on the list are saying “just grab any old 8X type cable and you will be fine”. I say use something with very low loss and suggested small heliax. Any suggestions? Vern s/v Nirvelli KI4ONW -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] R1225 Question
I believe that you can also program accessory connector option lines as channel select inputs. This will let you select channels without a control head. Eric Lemmon wrote: Joe, The control head is needed only to change modes in local control, listen to the incoming audio, and for programming. Since a repeater only needs one channel, just ensure that channel 1 is active. 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: Sunday, November 22, 2009 5:19 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] R1225 Question I have two R1225 repeaters, but only one control head. Does anyone know what mode the radio stays in with the head removed? Both radios are 4 mode radios. I do have the strapping info when taking off the head to make it active. I want to go up to the site with the UHF R1225 and remove the head, but don't know what mode it will be in without the head. All 4 modes are programmed in this particular radio. 73, Joe, K1ike __._, -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Re: Weird Interference between APRS and 2-M repeater help needed
Only on UHF. VHF was a lowpass filter. Kris Kirby wrote: On Mon, 2 Nov 2009, dep...@starband.net mailto:depley%40starband.net wrote: I believe you are right. Simplex is difficult with a circulater. Can you receive through a circulator without heavy losses? I've never tried it... Older Micor mobiles had a built-in circulator and a T/R relay. -- Kris Kirby, KE4AHR Disinformation Analyst -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Radio conversion to 225MHZ
I have several Mitsubishi 220 PA Hybrid Modules. 100 mW in, 20~25 W out. $30 each. I have a friend that made some interface PCBs, not essential, but handy. I'll ask him what he wants for them if anyone is interested. Eric Lowell wrote: I did a Micor mobile once (VHF-Hi to 220) It was a lot of work and the PA won't convert, so you need to address that. Also did a GE MPI portable, Came out okay, but a rock bound 2 watt, 2 channel portable is not really worth the effort, given the cost of Icom 3ATs etc. Not sure about the newer stuff. GL de W1EL Eric Lowell Eastern Maine Electronics Inc. 48 Loon Road Wesley ME 04686 eme@starband.net www.satnetmaine.com --- On *Wed, 10/14/09, J /aat...@yahoo.com/* wrote: From: J aat...@yahoo.com Subject: [Repeater-Builder] Radio conversion to 225MHZ To: Repeater-Builder@yahoogroups.com Date: Wednesday, October 14, 2009, 7:41 PM Has anyone converted any of the commercial (GE/Motorola) radios to the 220 band? If so what works and what doesnt. I need several 225 radios and thought this might be a route to go. Thanks in advance Jim -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Micor Repeater Modifications
They might tune done. If not, try brass screws. I've used this to move high splits to 2 meters. tahrens301 wrote: Hi Folks, I picked up a bunch of Micor repeaters today, and as I figured, they have the TLD xxx4 receiver in them. (160-174mhz). I know that to put on 2 meters, new resonators some other stuff is required, but is it necessary if I go down to 154? I'm working on this as a backup repeater for our FD. Also, DRAT, no channel elements! Did find one other interesting piece - an X9000 base station. Mighty big will certainly hold down the desk. (yep, it really is an x9000 :-)) (previous thread). Thanks, Tim -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Repeaters vs RC
The Academy of Model Aeronautics went through a standards change a while ago. AM radios are no longer certified for exactly this reason. If he's using radios that don't meet modern performance standards he is invalidating both the airfield and his insurance. I'd like to know how he determined it is the repeater causing the interference under the conditions you describe. I'd also suggest he reread the regs on model control in the ham band. Oz MCH wrote: Does anyone have any experience with repeater operation vs RC operation (Remote Control)? I have an RC operator who is 'raising a stink' about a repeater that is 30 kHz away from one of his RC channels. BTW, he also wants to 'compromise' by offering to relocate the repeater off the 52-54 MHz segment so they will not impact his RC operations. Some compromise, huh? I think he has the impression that RC channels are 100 kHz wide (they are standard AM) because the 6M RC channels are spaced at 100 kHz (53.100, 53.200, 53.3500, 53.400, Etc). I've told him they cannot be more than 10 kHz wide, if that, and that the FC repeater would be only 16 kHz wide, and at 30 kHz away the two can coexist without interference. Oh, the repeater in question is at least 20 miles away from his flying site. Any input out there? Exactly how wide is his AM signal? Thanks, Joe M. -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Repeaters vs RC
No, that price is for a complete replacement - TX, RX and servos. Unless his system uses mechanical reeds and germanium transistors all he will need is an RX per plane (~$65) and a new TX, so buy a $200 Kit and four RX's $500 tomorrow, $350 if you shop. m...@nb.net wrote: So he is looking at $1000, as he has 5 channels/aircraft. Does that include the TX and RX units? Joe M. On Sun 11/10/09 8:04 AM , k7...@skybeam.com mailto:k7pfj%40skybeam.com sent: A nice system you can pick up for under $300 and even under $200 if you want basic. Mike Mullarkey K7PFJ 6886 Sage Ave Firestone, Co 80504 303-954-9695 Home 303-954-9693 Home Office Fax 303-718-8052 Cellular - F -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Re: Repeaters vs RC
Your assertions are true as far as they go, but AMA insurance is then invalid, and most other insurers follow their lead. The AMA standards are the litmus test for insurabilty and represent 'good practice' If the guy is rolling his own, he would understand enough to avoid this problem entirely. Your arguments while possible are unlikely in the extreme. The guy is at best using old assumptions with new gear, and at worst using ancient gear that is inadequate to the task, which is irresponsible. This isn't AM vs Sideband. Both were adequate to the task and neither induced a potentially dangerous failure in the other. They were merely annoying to each other. Given what we've been told, evaluation of his receiver's bandwidth isn't an option; he's already asserted that it's woefully inadequate and resisted attempts at a rational evaluation. Oz lenaw12 wrote: Again, operating in the Ham Bands doesn't hold the R/C guy to these specs as he can or might have rolled his own. However the specs show good engineering practice which as an Amateur he should aim toward. He really has no recourse except that others try to work with him. Crystals are often available through ham swapa and online auctions... From the WattFlyer RC Electric Flight Forums: Hitec no longer sells 50/53 mhz equipment. FMA and Airtronics do. I never run across anyone any more who flies on 53 mhz since it is for the old wide band stuff (100 khz spacing). 50 mhz is for modern narrow band equipment. Like AM vs Sideband ... it becomes a gentleman's agreement, after evaluation of his receiver's LW. _ . -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
