[Repeater-Builder] Re: Interference on VHF repeater
Hi Mike, thanks for your post - I'll think about this a bit more. There is no isolator on the TX - will add one (and BP filter) when I next go to site this week. The radio is synthesised. Regards, Brett --- In Repeater-Builder@yahoogroups.com, wb8vlc mas...@... wrote: I have inserted a 6dB pad in the antenna port of the duplexer and found that the IM products drop 12dB, and also curiously, the frequency of the products change. Removing the pad reverses this effect. The above says that it's a 2nd order mix, F1+F2, F1-F2, 2F1 or 2F2. Since it looks to be a 2nd order product, proven by your 6 dB attenuator causing a 12 dB drop, whereas a 3rd order IM product would drop the product by 18 dB. Th 2nd order mix indicates that it could be combination of an internally generated signal from your equipment F1, Probably in the receiver input stage itself and an outside signal source F2 from an external transmitter, yours or another adjacent one. A pure 3rd order IM product is typically an indication of an internally generated source in the receiver input stages itself without any externally generated sources, but not always. Also do you have an isolator on the TX output along with a Low Pass filter after the isolator ? Is this a synthesized exciter or crystal controlled ? If you can identify all the signals present on Spectrum Analyzer then with the above 2nd order formulas you could probably zero down the 2 signals causing the problem. Mike --- In Repeater-Builder@yahoogroups.com, brett brett_dawson@ wrote: Hi all, I have come across an interesting problem which you may be able to shed some light on. I have an intermod issue where my TX sometimes opens up my RX. I have the distinctive hollow pipe sound. Both TX and RX have the same CTCSS tone. The intermod product is however not always present, and after looking at the RX output from the duplexer with a SA I see a comb of products that move slowly in time. When one of the products in the comb falls within the RX bandwidth the RX opens, until it moves on. This is not a busy site, and I have been able to power down everything on site except my repeater. Problem remains unchanged. I have also disconnected feeders from all other RF equipment on site - still no change. The fact that the IM product frequency changes with time (drift rate is roughly a few kHz's an hour) makes me think that there is either another unknown source of RF on site which has poor freq stability (pretty unlikley), or somehow my TX freq is involved in producing this freq. I have inserted a 6dB pad in the antenna port of the duplexer and found that the IM products drop 12dB, and also curiously, the frequency of the products change. Removing the pad reverses this effect. I have repeated this many times and the result was always the same. It appears that the frequency of the IM product is dependent on the strength of the radiated field from my antenna. This is my question: I have read that it is possible for a strong EM field to excite metal (eg tower member) such that re-radiation will occur at a frequency which is different from that which excited it. Can anyone confirm they have seen this, or can anyone point me to a reference that talks about this? I should also mention there are multiple solar panels and associated regulators on site. The regulators have been discounted as possible sources, but the panels (given they may have bypass/blocking diodes) may be a mixing location, however the source of the drifting tone is still unclear. Thanks, Brett VK2CBD.
[Repeater-Builder] Re: Interference on VHF repeater
Hi John, I thought we may have a dubious TX issue - either spurs or as you say something unstable or oscillating. I replaced the TX. It had no impact on the problem. The issue appears to be external to the TX. Also I have terminated the duplexer into a 50ohm load and looked at the RX port of the duplexer and found it to be clear of anything. Regards, Brett --- In Repeater-Builder@yahoogroups.com, John J. Riddell ve3...@... wrote: Bret, you might have your PA going in to oscillation creating the spurs due to a highly reactive duplexer. We had a similar problem here many years ago and fixed it with a simple tuner on the TX similar ot the GE Z matcher . The one that we used was Home Brew. When the tuner was adjusted for minimum VSWR, the spurs went away. 73 John VE3AMZ - Original Message - From: brett brett_daw...@... To: Repeater-Builder@yahoogroups.com Sent: Saturday, September 04, 2010 7:26 AM Subject: [Repeater-Builder] Interference on VHF repeater Hi all, I have come across an interesting problem which you may be able to shed some light on. I have an intermod issue where my TX sometimes opens up my RX. I have the distinctive hollow pipe sound. Both TX and RX have the same CTCSS tone. The intermod product is however not always present, and after looking at the RX output from the duplexer with a SA I see a comb of products that move slowly in time. When one of the products in the comb falls within the RX bandwidth the RX opens, until it moves on. This is not a busy site, and I have been able to power down everything on site except my repeater. Problem remains unchanged. I have also disconnected feeders from all other RF equipment on site - still no change. The fact that the IM product frequency changes with time (drift rate is roughly a few kHz's an hour) makes me think that there is either another unknown source of RF on site which has poor freq stability (pretty unlikley), or somehow my TX freq is involved in producing this freq. I have inserted a 6dB pad in the antenna port of the duplexer and found that the IM products drop 12dB, and also curiously, the frequency of the products change. Removing the pad reverses this effect. I have repeated this many times and the result was always the same. It appears that the frequency of the IM product is dependent on the strength of the radiated field from my antenna. This is my question: I have read that it is possible for a strong EM field to excite metal (eg tower member) such that re-radiation will occur at a frequency which is different from that which excited it. Can anyone confirm they have seen this, or can anyone point me to a reference that talks about this? I should also mention there are multiple solar panels and associated regulators on site. The regulators have been discounted as possible sources, but the panels (given they may have bypass/blocking diodes) may be a mixing location, however the source of the drifting tone is still unclear. Thanks, Brett VK2CBD. Yahoo! Groups Links
[Repeater-Builder] Re: Interference on VHF repeater
Paul, no fluro lights on site. Actually no lighting at all - the site is solar powered so little capacity for lighting. No repeater ocntroller - the RX is directly connected to TX via a very simple (passive) audio and PTT circuit. I believe it is an IM product because the RX requires a CTCSS tone to open and the only TX on site that has the correct tone is my TX. Also the interference is only present when my TX is active, and the hollow pipe sound on the audio does sound like audio feed back you'd expect if your own TX was part of the mix. With a spectrum analyser in the RX signal path I can see the intermod products appear when the TX is active. They are at approx 30kHz intervals across the RX half of the duplexer band pass. Cheers, Brett --- In Repeater-Builder@yahoogroups.com, Paul Plack pl...@... wrote: Brett, How did you determine it's an IM product? What repeater/controller combination are you using? I'd try powering down the controller and manually keying the transmitter. If that solves it, it could be the controller's reference oscillator or divider outputs leaking onto the PTT line or elsewhere. Any compact fluorescent lights nearby? 73, Paul, AE4KR - Original Message - From: brett To: Repeater-Builder@yahoogroups.com Sent: Saturday, September 04, 2010 5:26 AM Subject: [Repeater-Builder] Interference on VHF repeater I have the distinctive hollow pipe sound. Both TX and RX have the same CTCSS tone. The intermod product is however not always present, and after looking at the RX output from the duplexer with a SA I see a comb of products that move slowly in time. When one of the products in the comb falls within the RX bandwidth the RX opens, until it moves on. This is not a busy site, and I have been able to power down everything on site except my repeater. Problem remains unchanged.
[Repeater-Builder] Re: Interference on VHF repeater
Eric, all cables are double shielded. No adaptors are used. There is no isolator on the TX side. Connectors are silver plated, with gold pins. Antenna is a single folded dipole mounted about 15m above the equipment shelter. TX power into the antenna is approximately 15W. There are solar panels within 2m (below) of the anntenna. Putting the attenuator at the RX port of the duplexer reduces the IM products 1 for 1, ie 6dB of attenuation at the RX port reduces the IM by 6dB. BTW I used a 50W rated attenuator and Txed for short periods only so think overheating of the attenuator is not that likely. Yes TX freq is stable and not drifting. Also I have tried a second TX with smae results. Regards, Brett --- In Repeater-Builder@yahoogroups.com, Eric Lemmon wb6...@... wrote: Brett, Some additional information will be helpful. What makes/models of equipment are in your repeater? Are all jumper cables and the antenna feedline double-shielded? Are any of the connectors nickel-plated? Are there any barrels or adapters in your jumpers? Is there an isolator/circulator following the transmitter? What antenna are you using, and how far above the repeater equipment is it located? Try putting your attenuator right at the RX input connector, and repeat your IM test. Putting it at the antenna output is not a good idea, since the TX output power can cause it to overheat. Your description of the IM product suggests that it might be a spur generated within your PA, which could drift due to temperature changes. Have you verified that your TX carrier frequency is stable, and not drifting? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of brett Sent: Saturday, September 04, 2010 4:27 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Interference on VHF repeater Hi all, I have come across an interesting problem which you may be able to shed some light on. I have an intermod issue where my TX sometimes opens up my RX. I have the distinctive hollow pipe sound. Both TX and RX have the same CTCSS tone. The intermod product is however not always present, and after looking at the RX output from the duplexer with a SA I see a comb of products that move slowly in time. When one of the products in the comb falls within the RX bandwidth the RX opens, until it moves on. This is not a busy site, and I have been able to power down everything on site except my repeater. Problem remains unchanged. I have also disconnected feeders from all other RF equipment on site - still no change. The fact that the IM product frequency changes with time (drift rate is roughly a few kHz's an hour) makes me think that there is either another unknown source of RF on site which has poor freq stability (pretty unlikley), or somehow my TX freq is involved in producing this freq. I have inserted a 6dB pad in the antenna port of the duplexer and found that the IM products drop 12dB, and also curiously, the frequency of the products change. Removing the pad reverses this effect. I have repeated this many times and the result was always the same. It appears that the frequency of the IM product is dependent on the strength of the radiated field from my antenna. This is my question: I have read that it is possible for a strong EM field to excite metal (eg tower member) such that re-radiation will occur at a frequency which is different from that which excited it. Can anyone confirm they have seen this, or can anyone point me to a reference that talks about this? I should also mention there are multiple solar panels and associated regulators on site. The regulators have been discounted as possible sources, but the panels (given they may have bypass/blocking diodes) may be a mixing location, however the source of the drifting tone is still unclear. Thanks, Brett VK2CBD.
[Repeater-Builder] Re: Interference on VHF repeater
Thanks - no battery chargers on site as all solar powered. There are solar charge controllers, though I think I have discounted these. No fluros either. All equipment was switched off for a test, so any SMPS should have been off. Cheers, Brett --- In Repeater-Builder@yahoogroups.com, DCFluX dcf...@... wrote: Look around for a switch mode power supply that uses 600kHz as the switch frequency. SMPS Battery Chargers are popular for causing this. Also florescent twist lights are really good for making desense on VHF.
Re: [Repeater-Builder] Multiple Emails
Me 2 Brett WD7F - John in Tucson wrote: Yes... - Original Message - From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Wednesday, March 28, 2007 8:37 PM Subject: [Repeater-Builder] Multiple Emails Anyone else getting multiple copies of the same email on any or all of their subscribed Yahoo Groups? I'm seeing as many as 10-12 exact duplicates showing one time stamp then the same exact email 6-8 times at a different time stamp. Randy Yahoo! Groups Links 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: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Mystery Signal
Hi Guys. Just to throw me 2 cents worth it may be Yaesu / Vertex ARTS. It is a new polling range finder feature. I have contacted them re the system and the tx and rx processes that are involved but to no avail as yet. It looks like a tricky one to find. Cheers Brett [EMAIL PROTECTED] wrote: I can remember getting my Yaesu FT-5100 into some strange mode that sounded exactly like that every time I keyed down. Three DTMF digits (I never knew which ones) but the tones did not change between digits. Sounded exactly like your wave file. 73 - Jim W5ZIT -Original Message- From: [EMAIL PROTECTED] mailto:dcflux%40gmail.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Tue, 12 Dec 2006 3:40 PM Subject: Re: [Repeater-Builder] Mystery Signal Didn't Kenwood radios have a DTSS system? My old TH-77 did, The default code was also 000. Although I have never heard of a radio just beaconing. On 12/12/06, Scott Overstreet [EMAIL PROTECTED] mailto:scott%40becklawfirm.com wrote: Dave--- That is open squelch (White Noise) before and after the approximately one second presence of the signalthe data, if there is any, is thought to follow the third tone and finishes before the signal carrier, with PL, goes away. Scott - Original Message - From: Dave Schmidt To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Tuesday, December 12, 2006 12:02 PM Subject: Re: [Repeater-Builder] Mystery Signal In the wav file is that white noise or data bursts before and after the dtmf? Dave / N9NLU On 12/12/06, Jaime [EMAIL PROTECTED] mailto:cgold1%40yahoo.com wrote: Sounds like a digital signal. Could it be one of those new d-star rigs that some one has activated the autodial feature on the dtmf pad too? The DTMF sounds like it is coming from an autodial feature. My HT has this feature and so does my mobile rig. Jaime-KA3NXN - Original Message From: Scott Overstreet [EMAIL PROTECTED] mailto:scott%40becklawfirm.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Cc: Scott Overstreet [EMAIL PROTECTED] mailto:scott%40becklawfirm.com; Dave Platt [EMAIL PROTECTED] mailto:dplatt%40radagast.org Sent: Tuesday, December 12, 2006 2:10:08 PM Subject: [Repeater-Builder] Mystery Signal Hello All An interfering mystery signal has suddenly appeared on the input (144.670 mhz.) of our repeater. Using a five kc. wide FM detector---The signal is approximately one second in duration opens with 100 hz. PL (which continues throughout) and then three DTMF zeros follow in rapid succession and then possibly a short period of some sort of data. The signal repeats exactly two times an hour and the source is off in between transmissions. This goes on continuously without interruption or apparent change. Our area is between urban and big city and the signal is strong enough to be heard over a wide area using only an HT. A wave file of the mystery signal is at: http://www.radagast .org/~dplatt/ hamradio/ Signal_3. wav using an FM detector with wide open squelch. We are obviously very interested in identifing this signal and its origin What is it ? Thanks-- Scott, N6NXI Any questions? Get answers on any topic at Yahoo! Answers. Try it now. __ Check Out the new free AIM(R) Mail -- 2 GB of storage and industry-leading spam and email virus protection.
Re: [Repeater-Builder] colinears as repeater antennas
Hi Ian. Good to see you have found the prob. Years ago when I did a lot of climbing I installed heaps and I mean heaps of Phelps Dodge collinear antennas. They were a bugger to erect on your own on top 8 inch triangle tower 180 feet up because they were near on bullet proof.2 1/2inch diameter base and 1 3/4 top end and those suckers were about 15kg or 30 lbs.Many of them are still in service now I look after the radios on the bottom end of the now. Cheers Brett - Original Message - From: Ian Wells To: Repeater-Builder@yahoogroups.com Sent: Friday, May 19, 2006 10:24 AM Subject: [Repeater-Builder] colinears as repeater antennas Hi guys Recently i have found a problem with our6db 473.575 mhz repeater colinear antenna that is being used as a repeater antenna .From brand new it seemed to work well but over time and especially on windy days it will generate desense on our repeater(see previous posts on fading desense).We have otherVHF/uhf antennas used on otherrepeaters that exhibit the same problemfor 3-5 years wheresometimes the weaker signals use to come good and clear and then go bad with chopping and scratching .After a extremely windy day we found that one of the antennas was faulty and wasn't even getting out 5-10kms .After replacing it with a new antenna we have no desense even when windy when the others are just showing signs of desense when windy .So it seems that the antenna develop a bad jointover time with the bending of the whip .I am wondering has anyone tried to make the fiberglass more resistant to wind movement.possibly filling the tube with foam or some other method .One manufacturer here had done the tube in PVC instead of fiberglass Thank You, Ian Wells, Kerinvale Comaudio, www.kerinvalecomaudio.com.au YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] Battery load Bank
Hi John. I am very interested in building a load bank. Can your manual be scanned. Cheers from OZ. Banjupb - Original Message - From: John J. Riddell To: Repeater-Builder@yahoogroups.com Sent: Sunday, April 30, 2006 1:35 AM Subject: [Repeater-Builder] Battery load Bank Some time ago, someone was looking for Battery Load Bank info for testing the capacity of batteries. I have now located the manual that I had, for a commercial unit and can copy it is required. John J. Riddell, VE3AMZ451 Cedarcliffe Dr.,Waterloo, Ontario, CanadaN2K 2J1 YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] Re: A couple of questions about hard line
So what is the ?issue. Sorry I could not resist. Cheers fro OZ - Original Message - From: Buley, Kenneth L (GE Indust, ConsInd) [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Tuesday, April 25, 2006 12:53 AM Subject: RE: [Repeater-Builder] Re: A couple of questions about hard line Don't call it a Kleenex unless it IS a Kleenex, otherwise, it's just a tissue !!! (sittin' back with tongue in cheek and BIG grin on face !!) Ken KY4DES -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of Harold Farrenkopf Sent: Monday, April 24, 2006 12:48 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: A couple of questions about hard line Please pass me a Kleenex! --- In Repeater-Builder@yahoogroups.com, Buley, Kenneth L \(GE Indust, ConsInd\) [EMAIL PROTECTED] wrote: And I guess you ALWAYS use generic CTCSS instead of PL (Motorola) or CG (GE) ? GEE WHIZ Ken KY4DES -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED] Sent: Monday, April 24, 2006 11:32 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] A couple of questions about hard line The proper name Heliax is owned by Andrew Corp. If you don't know what type hard line you have is, don't name it Heliax. Neil - WA6KLA Yahoo! Groups Links Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] down tilt
Hi Guys and Girls. Is there a location where I can get more info on the theory of collinear antenna's. They are used allot here in OZ at least over the past 30+ years that I have been in the game. I have read info on phasing multiple dipoles. TIA Brett - Original Message - From: bradley glen [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Sunday, April 09, 2006 6:37 PM Subject: Re: [Repeater-Builder] down tilt Hi All I agree with Kevin and have used this in the commercial field where the anteena was originallt cut higher than was to be used. I mounted the antenna upside-down and had good results-with some noticed downtilt which was good for the application .On the same token keep in mind that most of the efficiency of the collinear design lies at the first radiating element - reduced radiation as one extends to the end of the antenna. Good luck Regards Bradley glen zs5swt /zs5wt --- Chuck Kelsey [EMAIL PROTECTED] wrote: Thanks for saving me all the typing ;-) Chuck WB2EDV Kevin Custer wrote: I think what Chuck was getting at was the 'automatic' beamtilt of a vertical omni collinear (usually fiberglass) when it is run outside of its specified bandwidth. As a function of the element length in a coaxial collinear as compared to the applied frequency, the vertical beam pattern will change with applied frequency. If a coaxial collinear is fed with a signal that is exactly on its design frequency, the vertical beam pattern will be centered about the antenna, and the antenna will be at its highest radiating efficiency. If a coaxial collinear is fed with a signal that is 2% lower than its design, the antenna will exhibit a vertical beam downtilt of approximately 3 degrees and suffer approximately 10% loss in overall gain. If a signal that is 2% higher than the antenna design is fed into a coaxial collinear, vertical beam uptilt of approximately 3 degrees will occur, and again a loss of overall gain. These instances are not the case with binary or corporate fed dipole arrays, as the phasing harness predominantly controls the vertical beam pattern. Beam Tilt and efficiency doesn't change very much with applied frequency, and is one reason that the exposed dipole array is a better choice where wide band operation is required. Kevin Custer skipp025 wrote: Kind of loaded question/statement/answer really. All antennas have both horizontal and vertical beamwidth. Depending on what you think is beam-tilt... one could and some do say all antennas have a beam tilt and or a beam width. Others combine the description... In the more commercial world of antennas, we now see vertical omni repeater site antennas with adjustable beam tilt. But I'm not sure if I'd say they have to be made with fiberglass radomes (covers). There's more than one method used by the various mfgrs to adjust the beam tilt - beam width. For the most part we only see some models with adjustable setting in some vertical omni models with composite radomes. ... and you pay serious money for the adjustable beam tilt models. If you pay attention to the specs, you'll see values for the horizontal, vertitcal beam width and where needed, the/any adjustable beam tilt values. Your results will probably vary... cheers, skipp Yahoo! Groups Links [EMAIL PROTECTED] __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] desnse on community sites
Have you tried common earthing of the feeders? Do the radios have good shielding between them (metal cases no plastic). Have you looked at the site with a good specan? Is the sound you are hearing antenna flutter? 80 MHz Cols what brand are they? We found over here in the west we replaced cols with 4 stack dipoles because of flutter and bad joints internally. I really think it is time to check with a good Spectrum Analyser. You may be surprised what you see coming done the feeders from the other txers. Make sure you look at the rx freqs when they are all in rx only, you may well find that you have a sprogy rxer basically txing into you other rxers. Cheers Brett - Original Message - From: Ian Wells To: Repeater-Builder@yahoogroups.com Sent: Thursday, March 30, 2006 6:33 AM Subject: [Repeater-Builder] desnse on community sites Hi guys .I have a small problem that i have been trying to sort out for a while now .I have 5 repeaters operating on one of my sites 3 vhf low band and 2 uhf band.The frequencies are as follows VHF A-TX 70.300MHZ RX 72.800MHZ fitted with 4 1.5 meter by 4 inch meter tins-most likely a notch diplexer 3db colinear ant FM828E B-TX 70.5875MHZ RX 73.0875MHZ fitted with 4 1.5 meter by 4 inch meter tins-most likely a notch diplexer3db colinear ant FM828E C-TX 70.725MHZ RX 73.225MHZ fitted with a new band pass/band reject possibly a varinotch 3db colinear ant FM828E UHF D- TX 473.575 RX 478.775MHZ fitted with mobile notch diplexer 6mc450s 6db colinear ant MAXON PM150/SM4450SC E- TX 489.1MHZ RX 483.900MHZ fitted with 6ld450s diplexer 6db colinear ant MAXON PM150/SM4450SC All coaxes are Heliax from antennas to Diplexers with N connectors Interconnecting cables between diplexers and radios are rg223u A and B are a 1.5 meter apart with C in the middle All antennas are mounted aprox 50 cms or more away from C or each other . D and E have a 1.5 meter between them ie- D A C B E I am at times having desense (ie scratch ) especially in windy weather occuring on repeaters B and D.It doesn't seem to affect the desense wether the transmitters are txing or not .There isnt any problem of the repeaters affectingeach other ,they all work great just the problem of scratch coming and going .A,C and E do get scratch on occasion but no whereas bad as D and B.D and B works great sometimes (clear with no scratch)and then reception willslowlydevelope major scratch and then slowly clear up -possibly electrostatic or wind moving the antennas ?.I havebeen fixing loose bolts on the windmill tower to stop problems incase of tower twist and this affecting service.I am wondering if there are any futhersugestions . Thank You, Ian Wells, Kerinvale Comaudio, www.kerinvalecomaudio.com.au YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] Re: Cheap Tunnel Heatsink
Variable 1 amp to 100 amp. 12v to 60volt. Brett - Original Message - From: Dave VanHorn [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, February 13, 2006 8:31 AM Subject: [Repeater-Builder] Re: Cheap Tunnel Heatsink --- In Repeater-Builder@yahoogroups.com, Mike Morris [EMAIL PROTECTED] wrote: Anybody want to write up an article for repeater-builder.com on the power supply test load? Are you looking for something like a constant current sink? Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Cheap Tunnel Heatsink
Hi guys does anyone have that circuit diagram I need to build one to test 12 to 60 volt supply. Thanks in advance. Brett - Original Message - From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Sunday, February 12, 2006 10:01 AM Subject: Re: [Repeater-Builder] Cheap "Tunnel" Heatsink In a message dated 2/11/2006 3:10:54 PM Eastern Standard Time, [EMAIL PROTECTED] writes: http://www.ve3tjd.com/pictures/tech%20stuff/ What a perfect heatsink for that variable power supply load that was bouncing around on R-B about a year or two ago. You could vary the Amp Load on your power supply using a variable pot control. Gary K2UQ YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] UHF Power
Here in OZ we only run 25 watts for mobile and 50 for bases / repeaters. Cheers Brett - Original Message - From: Chuck Kelsey [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Sunday, February 12, 2006 10:02 AM Subject: Re: [Repeater-Builder] UHF Power Sure they would. There was a long time ham (now SK) who would not run anything less than 100 watts from his mobile. Didn't matter what band -- had to be at least 100 watts or he wasn't happy. I've seen the same thing in public safety service. For years you couldn't get the local fire departments to run a mobile at anything less than 100 watts, didn't matter if it was on 46.10 MHz or on the UHF MED channels. Today, however, they are running 25 watts and find that it works just fine. Chuck WB2EDV Kevin Custer wrote: Besides the math, in real practice it's easy to see how well matched a properly working 200 watt repeater operates. If it didn't make a difference, no one would pay the price to run this much RF. The equipment costs more, as well as the electric bill, and I don't know anyone around here that would enjoy running a repeater that out-talks the receiver. Kevin Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: 2 x mini CTCSS encoders needed Please
Hi thanks for the info. The 2 off that I need is ST-140. The only place left in the Kyodo KG-109 is in the VCO can. It has a removable cover and it has been done many time and works. Cheers Brett - Original Message - From: skipp025 [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, February 06, 2006 12:49 PM Subject: [Repeater-Builder] Re: 2 x mini CTCSS encoders needed Please Make them... there's a ctcss encoder project on my www.radiowrench.com/sonic web page using the 555 timer chip. Before you yahoo's give me grief about the stability of the circuit you should try one. They work very well and are relatively stable over a large range of operating voltages. I can make one the size of my finger nail using the mentioned circuit. skipp banjupb [EMAIL PROTECTED] wrote: Hi Guys and Girls. I need 2 mini encoders for our volunteer fire brigade hand helds. I could use good s/h as these are mainly used for monitoring but some times on air. Can you help I am in Australia. Cheers Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] 2 x mini CTCSS encoders needed Please
Sorry guys. I have just got back to my office and started to read your responses (which I am glad to get). What I need is 2 x CTCSS boards that are 15mmL x 20mmWx 5mmH. I need to fit 1 into each Hand Held. Thanks for your help. Cheers Brett - Original Message - From: Mark A. Holman [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, February 06, 2006 11:38 AM Subject: Re: [Repeater-Builder] 2 x mini CTCSS encoders needed Please How about this.. Have something depending on your band Motorola has some decent HTs which I am thinking like same freq I'll chart the idea here. Channel 1 freq xxx.xxx Mhz. CTCSS A Channel 2 freq same as 1 CTCSS B Channel 3 freq. xxx.xxx different freq. CTCSS B or C idea is one CTCSS tone can page , next on same channel can be working channel 2 and Channel 3 would be available for more supervisory or secondary work channel. one area in a Major city actually has 3 CTCSS tones on the same channel using some thing programmed to dispatch calls in different areas of a city with 6 Channels in a 30,000 + population, also laptop communications, 800 Mhz. circuits. only recently had their Nextels taken away abuse of calling wife, girlfreinds, etc.. taxpayers paid a big sum for private conversations. and Nextel thought to make money by giving free Nextels to every cop in the US !!! Cha Ching ! banjupb wrote: Hi Guys and Girls. I need 2 mini encoders for our volunteer fire brigade hand helds. I could use good s/h as these are mainly used for monitoring but some times on air. Can you help I am in Australia. Cheers Yahoo! Groups Links -- MZ� Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Crimp versus Clamp Connectors
I have never had a clamp up style connector cut the braid. All the connectors I use on pro installs are clamp up style and never a joiner, adapter in sight. I was taught that if you don't the correct connector GET ONE no adaptors ever. This maybe is an old idea but for 30 years has worked for me. P.S. justhad a look at the duplexer pics on W4ZT and spied a Eastpenn gel battery these I use for back up power. Cheers from down under Brett - Original Message - From: Tony King, W4ZT [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Wednesday, February 01, 2006 10:46 PM Subject: Re: [Repeater-Builder] Crimp versus Clamp Connectors Eric Lemmon wrote: Lee, I appreciate your comments, but I can rebut them easily. I have seen too many clamp-type connectors pull apart, usually because they were over-tightened during assembly. Take a close look at a MIL-spec clamp-type N connector, and you can see that the knife-edge component can slice right through the braid if the nut is over-tightened, allowing the cable and the center conductor to pull right out of the connector. snip Every Mil-spec clamp type N connector I have ever made put the knife edge towards the red gasket material, not the braid. See the scan of an original instruction sheet: http://testeqdocs.w4zt.com/nconnector/ 73, Tony W4ZT Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Balloons to be tested as cell-tower Replacement
Looks good until you get a major atmospheric disturbance like a large fire or storm or cyclone. See Ya. Brett - Original Message - From: KA9QJG [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, January 30, 2006 7:46 AM Subject: [Repeater-Builder] Balloons to be tested as cell-tower Replacement Well forget looking for Tower Repeater Sites Maybe this will Work As A Alternate http://tinyurl.com/7mwdh Happy Repeater Building 73 De Don KA9QJG Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: Balloons to be tested as cell-tower Replacement
Here is an idea the static on the zip cord could be rectified and used to power the gear. No batteries just a super cap or 2. Cheers Brett - Original Message - From: Coy Hilton [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Tuesday, January 31, 2006 9:32 AM Subject: [Repeater-Builder] Re: Balloons to be tested as cell-tower Replacement Not really, just use a long cord for a teatherLets see...what's the voltage drop across about 10 miles of #16 zip cord;-) Just give this group a few minutes and we'll have this whole thing solved. --- In Repeater-Builder@yahoogroups.com, Dave VanHorn [EMAIL PROTECTED] wrote: --- In Repeater-Builder@yahoogroups.com, KA9QJG [EMAIL PROTECTED] wrote: Well forget looking for Tower Repeater Sites Maybe this will Work As A Alternate http://tinyurl.com/7mwdh Getting the 100AH battery up there is going to be a problem though.. Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] battery question
Hi Guys and Girls I use Eastpen Gel Batteries here in OZ and they are the best in + 60 degrees C to - 10 degrees C. I have even used them in cars and with more than 5 years they are cool. You can buy then cheaper than I can they come from the USA. Cheers Brett - Original Message - From: Q [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Sunday, January 15, 2006 12:10 AM Subject: Re: [Repeater-Builder] battery question NO!Car batteries will sulphate and vent dangerously explosive hydrogen gas,are meant to be discharged quickly and recharged immediately and dont last long in backup service.Most site owners wont allow them to be used. Sealed lead/acid will last 5 to 10 times longer and are designed for the intended purpose.There is lots of good info on the web,do a search! 73,Lee [EMAIL PROTECTED] wrote: At 1/14/2006 01:09, you wrote: The sealed lead acid cells have a much better deep cycle capacity. Just don't overcharge them. Dave WB2FTX Given that batteries used in backup service rarely get cycled at all, wouldn't car batteries be a more cost-effective choice? (assuming the gel cels were not a gift) Bob NO6B Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: battery question
That's the babies. The commercial batteries are the ones we use for most cases, wheelchairs, comms, and in our cars. Some time ago I was in Sydney (East Coast), picked up a battery to try just before flying home to Perth (West Coast) I took it on board as carry-on baggage it was a small one with the documentation showing it was sealed. Well you should of seen the look on the x-ray guys face and then the security came from every where. I don't think I would get a way with it now. he he. I would recommend these to anyone. They also have various acid concentrations (SG) for different parts of the world. I am having a seniors moment I think it is southern hemisphere uses a higher sg than the north to get the same capacity (normal wet batteries). We used the lower SG in drilling rig where they were in 60 degrees C plus during the day so they did not boil them dry. Some of the rigs had evaporative coolers fitted to the battery banks to lower the temp. No batteriesnodrill bit rotation no money. So enough from me. See ya and thanks for a excel group Brett Down Under - Original Message - From: Dave VanHorn [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Sunday, January 15, 2006 6:56 AM Subject: [Repeater-Builder] Re: battery question --- In Repeater-Builder@yahoogroups.com, Brett [EMAIL PROTECTED] wrote: Hi Guys and Girls I use Eastpen Gel Batteries Do you mean East Penn? (as in pensylvania) http://www.eastpenn-deka.com/ Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] still searching: settings TAIT T800 CTCSS boards
Hi I have got the info just now from a friend and I will try to send to you tonight it is 16:21 hrs now. Cheers Brett - Original Message - From: Bernd Maestling [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Wednesday, December 14, 2005 6:42 AM Subject: [Repeater-Builder] still searching: settings TAIT T800 CTCSS boards Hello, I'm still looking for the DIP-switch settings of the TAIT T800 Series I internal CTCSS boards. If someone have some informations please let me know. 73 Bernd DM5BM Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: T800 CTCSS boards: received informations
Hey yes it would be good to have a full copy I only have 2 pagers of the 8 odd pager. So yes I would like a copy Thanks. Cheers Brett - Original Message - From: wa6rqd [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Friday, December 16, 2005 6:59 AM Subject: Re: [Repeater-Builder] Re: T800 CTCSS boards: received informations Bernd Maestling wrote: Hello Brett, I already received the informations today, thanks anyway. William, N9BOE, gave me the pdf earlier this morning. So if anybody else need this file, please let me know. 73 Bernd DM5BM Bernd, If possible, I would appreciate a copy of the pdf. Thanks Ed Yoho Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] still searching: settings TAIT T800 CTCSS boards
Hi I believe the ctcss is set during programming. IE channel freq and ctcss. Cheers Brett - Original Message - From: Bernd Maestling [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Wednesday, December 14, 2005 6:42 AM Subject: [Repeater-Builder] still searching: settings TAIT T800 CTCSS boards Hello, I'm still looking for the DIP-switch settings of the TAIT T800 Series I internal CTCSS boards. If someone have some informations please let me know. 73 Bernd DM5BM Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Off Topic, but curiosity.............
What? - Original Message - From: Ken Arck [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, November 28, 2005 7:20 AM Subject: Re: [Repeater-Builder] Off Topic, but curiosity. At 03:19 PM 11/27/2005 +0100, you wrote: Can someone share why this ítems are so expensive??? ---Because PT Barnum was right? :-) Ken -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html We offer complete Kenwood TKR repeater packages! We are now an authorized Telewave Dealer! AH6LE/R - IRLP Node 3000 http://www.irlp.net Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Solar Panel Question
Hi guys. Just a Q re: what diection and angle for panel at 3 degree south of the equater in Africa? Would you face some Nor-Eastly and some Nor-Westerly? This is a Q that has been hrown around since I installed and commisioned a 100km 4 x E1 link in Tanzania earlier this year. The gear was DMC Stratex DXR-100 24v 1.5 amp 400mhz. The longest path is 67km. Someadvice would be cool. Cheers from Down Under. Banjupb - Original Message - From: Kevin Custer To: Repeater-Builder@yahoogroups.com Sent: Sunday, November 13, 2005 6:40 AM Subject: Re: [Repeater-Builder] Solar Panel Question I'm not trying to start a fight, Eric, just answer a few questions. Unless you are pointing the dissimilar panels in different directions [Unless we have two or more suns, the panels should be in the same plane, pointing in the same direction. Since the angle for optimum operation in the winter is steeper than in summer, it is generally a good idea to use the winter angle year around. In summer, there is usually an excess of solar energy, so the winter angle is more than adequate.] Around here, some folks are experimenting with the east to west alignment of several panels. Most of us are not fortunate enough to have a sun tracker mount, and just as it's important for summer/winter declination, folks are seeing that there are instances where several smaller panels in a east to west alignment will have advantage over one large stationary panel. [I have bought panels from Siemens, Solarex, Shell, and Phillips, and *none* of them included a diode on the output. An output diode is *not* the same thing as a diode embedded within the panel itself. Okay, so what is the embedded one for? Remember that one of the tasks performed by a good solar controller is to shunt all of the excess power produced by the panels, once the batteries are fully charged. Can you elaborate on this, Eric? [Most of the better solar charge controllers have three basic functions: 1. To regulate the current going to the battery so that it is not overcharged; 2. To disconnect the load when the battery voltage falls to a level where either the battery or the load can be damaged ; 3. To shunt excess energy from the solar panels, so that high voltages cannot damage the load equipment. It's important to note that the solar panels, the battery, and the load are independently connected to the controller so that it has complete control over the power distribution.One instance I see where the shunt function is very valuable is, *if* a large battery bank is not used (or none at all) excess energy could over voltage the load.I'm I on the right track?Kevin YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] Re: Using VOIP to control a repeater?
Hi I am very interested in voip to radio is there some good info in the mags. I am in oz and we can not get it here. Can recommend another source? Cheers Banjupb - Original Message - From: Mark A. Holman To: Repeater-Builder@yahoogroups.com Sent: Thursday, November 10, 2005 9:38 AM Subject: Re: [Repeater-Builder] Re: Using VOIP to control a repeater? if you are going to need a VOIP Connection for commercial application I may sugguest checking a Mag called Mission Critical I just got the recent issue and BTW FREE Subscription even the skinflints can afford that ! :-) lotta good stuff in there been a sub 4 well few yrs somewhere in the 90's mark h.Erik Finskas wrote: Coy Hilton wrote: If you have a couple of older computers that you wouldn't mind throwing at the project try using Echolink. You can have the link recover if it is dropped AND ONLY allow the "other" node to connect. like a private connection. If you don't know about Echolink ask around the local group and someone will fill you in. 73 AC0Y Just my two cents, I understood this is a commercial repeater, not ham radio, so echolink wont work as it requires registration of a licenced operators. .. Erik Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/ YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] Antenna system 4 short term portable uhf repeater
HI again, I am using 25 watt (awa rt85/ midland) repeater on 476.550 and 477.300 (750 kHz split)(uhf cb here in OZ). The mast will be 20' ally tube with a fibre glass section near the lower whip (rx). The top of the fibre glass mounted to the ground plains with the TX whip above the ground plain. We use a mobile whip that has 1/4 wave section, phasing coil and then a 1/2 wave section on the top giving 3 db ish, 20 MHz band width. What I figured was 3db TX and 3 db rx sounds good but vertical separation would be a problem. But what about if the TX whip inc a solid ground plain was mounted at the top and the same for rx was mounted directly under but upside down. This would give a solid ground plain between them. Normally you would need about 60' separation. Duplexers for this are very bulky and about $2000. I figure that get rid of the loss in the duplexer add a good double shielded feeder and what you end up with is a 3db 20mhz band width TX and rx antenna system. That can be used on any of the 8 uhf cb repeater channels. This may be an ugly solution but when dollars ($1600 in duplexers) counts this maybe a solution for a rapid deployment multi channel suit case repeater system. I hope this adds to my earlier email. I am very interested in your comments and advise. I am sure there are other applications other than OZ uhf CB repeaters. Cheers all from down under. - Original Message - From: Joe [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Friday, August 26, 2005 8:15 PM Subject: Re: [Repeater-Builder] Antenna system 4 short term portable uhf repeater Hello, You need to tell the group the receive and transmit frequencies and the transmit power level before anyone can venture a guess. Also, type of equipment would be helpful.You are on the other side of the world, so you may have to reverse TX/RX antennas to make it work properly seeing as you are upside-down from this side... ;-) Joe At 03:25 AM 8/26/2005 +, you wrote: Hi my learned freinds. I am interested if any body has tryed using 3db mobile whips mounted on a solid ground plain verticaly 180 degrees to each other and fed with separate coax to rx tx ports. Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Batteries in Parallel
Hi guys. I have been watching this backup battery discussion. We use Eastpen Geltech batteries from the states they are the best batteries no weekly monthly maintenance. We check them for capacity every 6 months and thats it. We use a product called Korode Kure on the battery terminals this keeps them clean and a good contact for many years. I have been using this for 30 years. I also use it under HF mobile whip bases. If really stuck out in the bush with a empty tube of KK I have used copper kote a nut and bolt antiseaze.Oh by the way I have had a unsealed battery bank go up so please venterlate the battery box to the outside world and keep a minimum 20 liter bottle of distiled water close at hand in the hut just in case. A 8hr + drive to medical help with acid burns is no fun. Cheers form down under. - Original Message - From: Mark A. Holman [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Thursday, August 25, 2005 8:42 PM Subject: Re: [Repeater-Builder] Batteries in Parallel As a sugguestion, if the wire has any green corrsion I would replace the stuff with new, especially if that wire got hot , from my experience. Mark AB8RU Tony VE6MVP wrote: At 12:42 AM 2005-08-25 -0400, you wrote: Those BCI -31's are good batteries, you can add extras on if you need to but you would have to go to a HD Truck Parts place or dealership to make up a special 2 or more battery cable, your cable should be #6 or larger diameter ( #4 ,or #0 ) depends on how much current the system is drawing.. All that was attached to those radios were 2 UHF linking radios wired back to back. So the most power they would use would be, guessing 20 amps, when one radio is transmitting. I have no idea what gauge of wire was used. They'd been there for at least five or ten years if not even fifteen or twenty. I say 20 amps because 22 amps was what an electrical place told me my mobile radio was consuming when we were stress testing the alternator and battery in my car. And the other ham was far, far more experienced with all this than I am. I was basically just the driver and gopher. smile Tony Yahoo! Groups Links Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Tait Repeaters
Hi Terry. What Tait repeaters do you have? I would need to know model # . Cheers - Original Message - From: tstone666 [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Tuesday, August 23, 2005 7:36 AM Subject: [Repeater-Builder] Tait Repeaters Any one have a manual? Any one know how the duplexer handles channel changes? What is the TX/RX seperation on the channel format i.e. + 5 megs like in the us for UHF or -5 megs or some odd split? Any one have a reasonable 110 power supply for Tait repeater? Anyone know how to computer interface the repeater? Warmest regards, Terry Stone (800) 932-3337 or (218) 2839290. Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] Re: VXR-7000
Hi Brian, I am not sure if this has been said already as I haven't been back through the thread however it seems that you may have a couple of issues here. Firslty your new equipment has significantly more OP and better RX sensitivy. This will certainly test the isolation afforded by the duplexer. Secondly your new TX may be noisier off freq than your original TX and so require more isolation at the RX freq. Given the increase in TX power this is almost certainly the case. Thirdly It would be interesting to work out if the desense is being caused by (i)fundamental overload of the RX (ii) TX sideband noise falling in the RX passband (iii) Other noise being generated by the TX operation, which falls in the RX passband The first 2 can generally be solved by improving the duplexer through additional cans/tuning etc. The third is trickier and really needs to be addressed at the source. For example if you have a noisy antenna (say water ingress has caused corrosion) filtering in the duplexer will not fix this problem. The same can be said for noise coming from other sources, eg connectors, metal on metal moving contacts in the TX field etc. A test you can do to isolate the problem is to terminate the OP of the duplexer in a 50ohm load. If desense goes away the problem may be noise from the antenna or feeder system or that the antenna/feeder system is presenting a high VSWR that has the effect of reducing isolation in the duplexer. If the desense persists the problem is probably in the duplexer, or lack of isolation between the TX and RX directly (ie leakage between them). This is a rough test but if you patch around one of the TX cavities (ie remove it from cct) and the problem doesn't change then it could be the RX cavities aren't rejecting TX carrier well enough. If you patch around one of the RX cavities and the problem doesn't change then it could be the TX cavities not rejecting the TX noise in the RX band well enough. If in either case the desense does get worse these tests aren't really valid. This test should be done with a 50hm termination on the antenna port. Be careful with all of the bits and pieces you test with. I was testing a 2m repeater recently and could not get rid of a desense problem. It turned out the 50ohm termination and some of the RF adaptors I had were noisey. Once I removed these everything worked well. With respect to your flaky TX power problem, that cavity you identified as the cause may also be generating noise which could be causing your desense issues. If possible pull it apart and look for corrosion, loose parts etc. Also check all the cabling and make sure there is no chance a connector is loose (ie not terminated properly) or a cable damaged. Shake the cavity and look at the transmission loss and VSWR - see if anything changes. Personally I would start by looking for something generating noise in the system rather than suspecting the cavity performance. Look hard at that crook TX cavity. Hope this helps. I have found these problems tricky and the best way to solve them is to logically eliminate as much as you can. The trial and error method can be very frustrating... Regards Brett (VK2CBD) --- In Repeater-Builder@yahoogroups.com, Brian [EMAIL PROTECTED] wrote: Ok, today we went out on the hill and did much testing. We ended up running the new repeater on 2 antennas as this seems to work and we are going to see how it goes for a bit. Several things were learned while testing things. 1. Our old machine was only putting out about 4 watts before the duplexers. We thought 10 to 12 watts. when we hooked up the new machine into the line with duplexers and all we noticed an odd thing. 2. The new machine took a couple of seconds to come to full power through the duplexers.key up needle on meter moved to about 15 watts kind of slowly and sporadiclly then boom suddenly jumped to full full power. We ended up through much swapping things around isolating this to one of the duplexer cans on the transmit side. Without that one can it keyed up instantly. Has anybody seen this and I assume it means that the can is bad or faulty This problem only showed up on the new repeater as the old one didn't put out enough power to seem to cause this problem. Anyway I really appreciate this list everyone here has been great. Brian -- [EMAIL PROTECTED] Amateur Radio Callsign: KC0DWX WARN (Weather Amateur Radio Network) member Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: Di-Electric Grease
Hi all. I to have used the dow stuff for years. It is 4 Compound I believe it is the same as the goop that andrews supply with their hardline connectors. Just about all the outdoor connectors that I have used over the past 30 years has had it in the connecting faces as well as inside the body. I have used it in the electrical joints on my boat trailer and on my 4 wheel motor bike(this is where faults apear in time). Cheers from down under. Ps I am making a portable repeater on 460mhz 10/15 watts and would like not to use a diplexer can you advise the solution. Maybe a tx groundplane with a solid disk and have the rx ant hanging directly below ie 180 degree to each other. The ch spacing is 500khz. I would use a foil or at least a double sheilded cable for each feed. See ya - Original Message - From: n8sac [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Thursday, May 12, 2005 8:34 PM Subject: [Repeater-Builder] Re: Di-Electric Grease --- In Repeater-Builder@yahoogroups.com, Vaughan Henderson [EMAIL PROTECTED] wrote: CRC have recently introduced Di-Electric grease for reducing / stopping corrosion and water ingress in connectors. Anyone tried it at RF? Any good? Any problems. Regards Vaughan ZL1TGC Vaughan I have used Di-Electric Grease for years Made by Dow-Corning the Product Number is # 111. Have used For everything from holding o rings in place while putting gear boxes togeather , Filling Electric boxes to keep water out have went back years later inside of box looked like new. I worked as Service Tech . on Auto controls for Water Sewer Plants Distrubtion systems. in a raidus of about 400 miles of Huntington WV . USA for 30 years .I have also used in PL-256 Conections for years in Ham Radio on all bands Some say not to use above VHF but I haven't had any problems. Is bether than getting water in conection as water will not displace this Grease. My vote is this Grease is almost as good as SEX if I could remimber what it was like. Oldmax Dale ( N8SAC ) Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Bag Cell Phone rant?
Hi guys I may have some M analogue bag phone 2 wire 600 ohm interfaces if you are interested. Cheers Brett - Original Message - From: Mark Holman [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Thursday, July 29, 2004 11:24 AM Subject: Re: [Repeater-Builder] Bag Cell Phone rant? If you put a Cell Roof Mount antenna on the metal building that will be sheilded from the repeater, as well improve reception, or get a Beam antenna and point it towards the cell site. Using Good Eng. Pratices is the key. Mark A. Holman, CRO, AB8RU [EMAIL PROTECTED] - Original Message - From: John Clark [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, July 26, 2004 12:30 PM Subject: Re: [Repeater-Builder] Bag Cell Phone rant? You are sadly right, and on that day I will depend entirely on mobile 2-way radio for communications. I'd rather hear a bit of static any day as opposed to bits of garbled digital mess. It's frustrating to me that cell phones with ring tones, cameras and games are better sellers than quality audio. They say the old brick phones (like mine) cause cancer. I say the tiny digital phones cause stress! The carriers in my area already look at the analogue channels as secondary, unimportant lines. John Clark - KI4AWK Thomasville, GA [EMAIL PROTECTED] FYI-in a couple of years, carriers will no longer be required to maintain analog channels, so you can bet that the analog channels will go away quite quickly, and the bag phone will no longer work. -- Jim Barbour WD8CHL Yahoo! Groups Links Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Maxar 80
Ron contact me off list I have a service manual. Brett - Original Message - From: Ronald Wicker To: Repeater-Builder@yahoogroups.com Sent: Monday, May 31, 2004 10:40 AM Subject: [Repeater-Builder] Maxar 80 I have a Maxar 80 UHF. How do these convert to repeater operation? Yahoo! Groups Links To visit your group on the web, go to:http://groups.yahoo.com/group/Repeater-Builder/ To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
