Re: [Repeater-Builder] Sd174 uhf
Ok installed a dummy load on the side we are not using and also tuned that to 517.025 and tuned the other side to 473.200 .Results are rx and TX though the 473.200 notched side is aprox 4db loss and the TX 517.025 is now producing 2 watt and no interference from the 473.200 transmitter so it looks like the idea worked .I just need to try it on site. Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Ph 0749922449 or 0409159932 or 0749922574 www.kerinvalecomaudio.com.au ---Original Message--- From: DCFluX Date: 8/12/2009 14:42:18 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Sd174 uhf A 50 ohm terminator should suffice, you may want to tune the terminated side to notch the TX frequency. On Mon, Dec 7, 2009 at 7:28 PM, Ian Wells kerin...@pacific.net.au wrote: Yep its a mobile style 6 pack notch .would it be best with a 50 ohm dummy load or 50 ohm terminator.I thought about tuning it with notch of 473.200 on the side we want to use (between the sd174 and antenna) and notch of 517.025 on the unused side (the side that goes to the dummy load) Thank You ,Ian Wells Kerinvale Comaudio, 361 Camboon road, Biloela.4715 Ph 0749922449 Mb 0409159932 Hm 0749922574 Fx 0749922767 www.kerinvalecomaudio.com.au ---Original Message--- From: DCFluX Date: 8/12/2009 12:59:08 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Sd174 uhf dont know that number, but sounds like a mobile style 6 cavity notch duplexer, try the other side if the insertion loss is too high going one way and the opposite side should have a 50 ohm load on it On Mon, Dec 7, 2009 at 6:01 PM, Ian Wells kerin...@pacific.net.au wrote: Can one side of a 6mc450s diplexer be used as I have a few of them laying around .The first test I tried worked well with a 6mc450s with no interference but the 174 lost a lot of its TX power through it .from 3 watt it reduced it down to .5 watt .I can say I didn't have a 50 ohm terminator on the unused port which I should try next time and see how that's goes Thank You ,Ian Wells Kerinvale Comaudio, 361 Camboon road, Biloela.4715 Ph 0749922449 Mb 0409159932 Hm 0749922574 Fx 0749922767 www.kerinvalecomaudio.com.au ---Original Message--- From: DCFluX Date: 8/12/2009 11:51:22 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Sd174 uhf In that case use a single notch cavity to remove the 473 frequency in question. Circulators can be used in conjunction with shorted stubs and cavities to create super narrow notch filters, but this may be more than you need. http://books.google com/books?id=trJ6rhF0lU0Cpg=PA122dq=circulator+notch+filter#v=onepageq=cir ulator%20notch%20filterf=false On Mon, Dec 7, 2009 at 5:21 PM, Ian Wells kerin...@pacific.net.au wrote: How would a circulator or isolator work .The transmitt signal from the data radio could pass through to the antenna and the rx signal could be received from the antenna and The signal you wish to remove from the data radio radio on receive could be notched to the dummy load . The data radio radio frequencies are set for 507.025mhz rx 517.025mhz TX and the frequency that is interfering is on 473.200mhz. Thank You ,Ian Wells Kerinvale Comaudio, 361 Camboon road, Biloela.4715 Ph 0749922449 Mb 0409159932 Hm 0749922574 Fx 0749922767 www.kerinvalecomaudio.com.au ---Original Message--- From: DCFluX Date: 8/12/2009 11:08:15 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Sd174 uhf depends on the quality of the filter. I would try using the coax stub routine with RG-58 as the coax, that should be fairly wide. But look at it on a spectrum analyzer to be sure it will pass both signals. If not try building a 3-5 pole interdigital BPF. Those can tune 10MHz wide easy. On Mon, Dec 7, 2009 at 4:57 PM, Ian Wells kerin...@pacific.net.au wrote: Our TX and rx frequencies are 10 meg apart so a band pass filter may have problems giving good signal on both or should I tune the filter in the middle of the two frequencies Thank You ,Ian Wells Kerinvale Comaudio, 361 Camboon road, Biloela.4715 Ph 0749922449 Mb 0409159932 Hm 0749922574 Fx 0749922767 www.kerinvalecomaudio.com.au ---Original Message--- From: DCFluX Date: 8/12/2009 10:53:00 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Sd174 uhf The lack of a front end comes to mind. You basicly got there a hand held in a pretty box with a DB-9. Try adding a bandpass filter, such as a bandpass cavity, shorted coaxial stub or a interdigital bandpass filter. On Mon, Dec 7, 2009 at 3:42 PM, kerinvale kerin...@pacific.net.au wrote: Hi guys .I have a SD 174 maxon data radio and it seems to not be able filter other transmitters near by .The receiver opens up with squark noise even when programmed with ctcss .can anyone suggest whats possibly the problem is and possible fixes.I have one on site
[Repeater-Builder] Sd174 uhf
Hi guys .I have a SD 174 maxon data radio and it seems to not be able filter other transmitters near by .The receiver opens up with squark noise even when programmed with ctcss .can anyone suggest whats possibly the problem is and possible fixes.I have one on site and it seems to be working perfectly but I know of two that are the same carn't filter signals nearby Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Ph 0749922449 or 0409159932 or 0749922574 www.kerinvalecomaudio.com.au .
[Repeater-Builder] Maxon smp4000 password
Hi guys .I found the password 317537.It was in the smp4000 programming manual Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Ph 0749922449 or 0409159932 or 0749922574 www.kerinvalecomaudio.com.au
[Repeater-Builder] Maxon smp4000
Hi guys .I have a maxon stand alone programmer and I have some sm4450 NE,SD and I have tried to program the eproms with two frequencies .one 507 with no problems and one with 517megs and it comes up with frequency max error .does anyone know thee password to access the parameters to charge the frequency max setting Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Ph 0749922449 or 0409159932 or 0749922574 www.kerinvalecomaudio.com.au
[Repeater-Builder] Linking
Hi guys.I would like to throw a interesting question to the forum.I have several uhf repeaters with links to our central hub . .one site receives on 479.350 and transmits on 474.150 through a 6ld450s diplexer into a 6db antenna mounted 9 meters above the repeater site and we have a 3 watt link radio transmitting on 481.825mhz through a 12db beam (at ground level) aimed to our hub site .The repeater works fine on its own however the link is the problem .My question would be Would I get more separation between the link and the receiver if I change the link transmitter up to say 500hz or should I move the link antenna away from the site.I suppose the question is would I get more separation by changing the link frequency or wouldn't it matter what frequency the link is on ,the link TX energy would still affect the repeater. Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Ph 0749922449 or 0409159932 or 0749922574 www.kerinvalecomaudio.com.au
Re: [Repeater-Builder] RE: Wavetek 3000
There is also a wavetek service monitor group on yahoo if you need any futher information on yr 3000 Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Ph 0749922449 or 0409159932 or 0749922574 www.kerinvalecomaudio.com.au
[Repeater-Builder] Kenwood tk-370
Hi guys .Would anyone know where we can replacement antenna parts for the Kenwood tk-370. I am chasing the sma-f antenna socket in the top of the radio and also a antenna but seem to be having trouble finding a supplier or replacement parts Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Ph 0749922449 or 0409159932 or 0749922574 www.kerinvalecomaudio.com.au
RE: [Repeater-Builder] Maxon sm4450sc
Hi Eric .Two radios here are not working properly and I found in one that the 8meg crystal was 2.4khz off frequency and in the other radio there is no 8 megs at all.so this should explain the radios not working .on a good radio the ctcss was 131.8 and the crystal was very near to the 8.2944mhz .On the service monitor the 131 was stable but the .8 was flicking up and down a little but it never altered from 131hz Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Ph 0749922449 or 0409159932 or 0749922574 www.kerinvalecomaudio.com.au ---Original Message--- From: Eric Lemmon Date: 18/10/2009 09:16:09 To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Maxon sm4450sc Ian, The CTCSS tones are derived from the timing of ASIC IC107, and are independent of the carrier frequency control circuit. Use your service monitor to sniff around the CPU to see if the clock is running at or very close to 8.2944 MHz. If it is way off, you'll need to replace the X1 crystal since there is no adjustment. Crystal X1 is type HC-184, part number 260-862-6Z. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups com] On Behalf Of kerinvale Sent: Saturday, October 17, 2009 2:36 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Maxon sm4450sc Hi guys .Has anyone come across the ctcss frequency being a little off frequency on a maxon sm4450 I.e. For 123 Hz the radio produces 122.5hz or below is there anyway to make the radio produce the exact programmed Hz Thank You, Ian Wells
[Repeater-Builder] Maxon sm4450sc
Hi guys .Has anyone come across the ctcss frequency being a little off frequency on a maxon sm4450 I.e. For 123 Hz the radio produces 122.5hz or below is there anyway to make the radio produce the exact programmed Hz Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Ph 0749922449 or 0409159932 or 0749922574 www.kerinvalecomaudio.com.au
RE: [Repeater-Builder] Maxon sm4450sc
Thanks . I will check them out Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Ph 0749922449 or 0409159932 or 0749922574 www.kerinvalecomaudio.com.au ---Original Message--- From: Eric Lemmon Date: 18/10/2009 09:16:09 To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Maxon sm4450sc Ian, The CTCSS tones are derived from the timing of ASIC IC107, and are independent of the carrier frequency control circuit. Use your service monitor to sniff around the CPU to see if the clock is running at or very close to 8.2944 MHz. If it is way off, you'll need to replace the X1 crystal since there is no adjustment. Crystal X1 is type HC-184, part number 260-862-6Z. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups com] On Behalf Of kerinvale Sent: Saturday, October 17, 2009 2:36 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Maxon sm4450sc Hi guys .Has anyone come across the ctcss frequency being a little off frequency on a maxon sm4450 I.e. For 123 Hz the radio produces 122.5hz or below is there anyway to make the radio produce the exact programmed Hz Thank You, Ian Wells
[Repeater-Builder] Vertex service manuals
Hi guys .Where can I download vertex service manuals .I am chasing a vx2200 because I have to adapt a ear muff headset to the radio.any suggestions for adapting /powering the mic (electret mic ) to the radio Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Ph 0749922449 or 0409159932 or 0749922574 www.kerinvalecomaudio.com.au
[Repeater-Builder] Text missing
Hi guys .I was wondering in my last posts some of my text was missing when I received the email . Is it a fault this end or is in the settings of the yahoo group Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
Re: [Repeater-Builder] Re: Text missing
Thanks I am using incredimail .ill check the settings Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: ka1jfy Date: 3/09/2009 08:52:13 To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Text missing Yahoo is notorious for not handling HTML mail very well. Plus, if you are using Outlook, there is a specific issue with the way it codes quoted material. Best suggestion is to send only in plain text, and have it delivered in Traditional' not 'Fully Featured' format. WalterH --- In Repeater-Builder@yahoogroups.com, kerinvale kerin...@... wrote: Hi guys .I was wondering in my last posts some of my text was missing when I received the email . Is it a fault this end or is in the settings of the yahoo group Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
[Repeater-Builder] Cable length
Hi guys Just updating on the 6mc450s style notch duplexer problem.We found one of the 6 tuning insulators inside were burnt through the insulator so we got the local engineering group to lave another insulator out of nylon rod and have put it back together and tested it on the service monitor and it comes up perfect on it and tested it with a maxon pm150 and we are now getting 40 watt output of the duplexer instead of 4-10watt so I think we have fixed it .We will know when we install it back into the repeater. Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
[Repeater-Builder] Cavity/duplexer connection cables
Hi again guys .After tuning a notch mobile duplexer with a service monitor and spectrum analyzer .The tuning indicated the duplexer was tuned correctly but when the 40 watt transmitter was applied then the output of the duplexer was around 10 watt then certainly something is wrong with the duplexer.I wonder if the low output of the duplexer is not bad matching of cable length but is more tied up with a faulty duplexer.maybe a burnt track of carbon inside the tuning tubes? Any thoughts .I have tuned 6ld450s notch duplexers with no worries and they produce 20 watt or more from 40 watt in. Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
RE: [Repeater-Builder] Cavity/duplexer connection cables
Thanks Eric .The uhf diplexer is a 6mc450s and it has been tuned to the makers procedure (tuned for the notch and not pass).The notches came up with ease around 70 db each side and the db loss at the pass frequency was around 1-2 db .I am using a hp8921a with the duplex out and ant in connections These mobile notch duplexers are supposed to do between 400-520mhz but as you say maybe they are built to suit the particular frequency for the client .There are plently of them available and they quote they are supposed to cover the frequencies.The interconnecting cables cannot be changed and are molded into the design of the duplexer. I have been able to remove the top screw plate from the one I am having problems with and have found one of the insulating tubes has a burnt hole through it so a spark of rf could jump from the tube to the adjusting screw and has burnt the tip of the screw black so this could be the cause of the static and loss of power because it was in the TX pass side.I will look at making a new insulator tube and test it again . I have other flat pack duplexers in use and they work perfectly I have been changing them slowly over to 6LD450s notch duplexers because they seem to work better than the mobile flat packs. Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
RE: [Repeater-Builder] Cavity/duplexer connection cables
.thanks Jeff .The duplexers are only being used with maxon 40 watt Radios and shouldn't be over the specs and the ants are the correct ones For the frequencies. I am thinking that when power is applied then the duplexer sparks Internally causing low output during transmission Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: Jeff DePolo Date: 08/29/09 07:48:42 To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Cavity/duplexer connection cables I'm not familiar with those particular duplexers, but the Celwave duplexers Eric mentioned are easily damaged by over-power. Usually the insulators at the open end of the resonators (the ends with the tuning slugs) arc over and/or develop carbon-ish deposits. In cases of mis-tuning, sometimes there is damage at the cabled ends as well. Their maximum ratings shouldn't be stressed, and make sure you have a good antenna load, they aren't very forgiving. --- Jeff -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of kerinvale Sent: Friday, August 28, 2009 4:59 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Cavity/duplexer connection cables Thanks Eric .The uhf diplexer is a 6mc450s and it has been tuned to the makers procedure (tuned for the notch and not pass).The notches came up with ease around 70 db each side and the db loss at the pass frequency was around 1-2 db .I am using a hp8921a with the duplex out and ant in connections.These mobile notch duplexers are supposed to do between 400-520mhz but as you say maybe they are built to suit the particular frequency for the client .There are plently of them available and they quote they are supposed to cover the frequencies.The interconnecting cables cannot be changed and are molded into the design of the duplexer. I have been able to remove the top screw plate from the one I am having problems with and have found one of the insulating tubes has a burnt hole through it so a spark of rf could jump from the tube to the adjusting screw and has burnt the tip of the screw black so this could be the cause of the static and loss of power because it was in the TX pass side.I will look at making a new insulator tube and test it again . I have other flat pack duplexers in use and they work perfectly .I have been changing them slowly over to 6LD450s notch duplexers because they seem to work better than the mobile flat packs. Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au http://www.kerinvalecomaudio.com.au/ http://geo.yahoo.com/serv?s=97359714/grpId=104168/grpspId=170 5063108/msgId=93649/stime=1251473201/nc1=5191952/nc2=5741395/nc3 =5758221 No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.65/2323 - Release Date: 08/28/09 06:26:00
Re: [Repeater-Builder] Re: Cavity/duplexer connection cables
With tuning the cavities /duplexers should we use 50 ohm pads or something else in line with the items when we tune them on service monitors Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: iain.philipps Date: 26/08/2009 15:57:13 To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Cavity/duplexer connection cables --- In Repeater-Builder@yahoogroups.com, John Sehring wb...@... wrote: There seems to be confusion mystery in the crowd of radio buffs that I han out with (not in this group!) on the subject of connecting cable lengths for cavity duplexer use. I've heard that the manufacturers of such devices also tend to be mum on this. These sets of cables are generally known (where I come from) as critical length harnesses. It seems to me that if these devices are tuned up to perform their function(s) (notch, peak, bandpass, bandreject, etc.) with 50 ohms of pure R in out as source load Z, cable length ought not make a difference (within reason, I'm not talking long cables with significant losses) to their performance. Is this so? Am I missing something? Thanx! Common sense would say you're right on the money. However, I think that common sense only applies if the velocity factor of your cable is 100%. There's also something to do with the shape of waves travelling along it, and voltage/current minima and maxima, I suppose :-)
[Repeater-Builder] Cable length
Hi again guys .This has been brought up before I know but I thought I need to ask this .With the length between the transmitter and diplexer should we keep the cable as short as possible because I seem to find I have more loss with longer rg223u cables (aprox 1 meter ) .I tried a isolator inline and it produced lower output than the cable did.Should I be using shorter lengths so to lower the loss .Maybe I should try heavier cable like hard line and see how much loss I get from that Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
Re: [Repeater-Builder] Maxon sm4450sc
Thanks mike good suggestion Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: Mike Morris WA6ILQ Date: 12/08/2009 07:53:27 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Maxon sm4450sc At 02:16 PM 08/10/09, you wrote: Hi guys .thanks for the replys .The fault was I had too much length between the radio and the ctcss decoder card .I have altered most of my repeaters to allow the maxons to decode the signal by itself and then it controls the transmitter by the maxon approved design with a bs170 fet .I have now developed a interface circuit that has no relays for switching audio .and the new design uses a 4066 audio IC to switch audio paths .It has reduced transmitting delays very well .Now the repeaters seem to work almost as soon as a signal comes in .One repeater decodes even if the signal is just below the mute .I need to find out how that one works.All in all very happy I have found the problem .Now I have repeaters with no ctcss breakup. Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au If you have not cast your design into concrete yet you might want to make one parts change. Use the 4053 (3 SPDT switches in one package) instead of the 4066 (4 SPST switches). Use the SPDT switches to feed either audio or audio ground to the next circuit downstream. With SPST you can only open and close the audio path leaving the downstream input floating when the switch is open. This can lead to hum, or at a site with high RF levels, other grunge. Rarely do common interface circuits need 4 switches, and the cost of the chip is pretty much the same. Mike WA6ILQ
Re: [Repeater-Builder] Hp 8921a test set
Hi guys just to finish off .the fault was the 2 amps in the input atten After these were replaced all tested ok . Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: kerinvale Date: 31/07/2009 01:31:06 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Hp 8921a test set I followed the unit test procedure and it failed on filter output detector output variable att,auto range att,duplex detector(no signal) Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: Scott Zimmerman Date: 31/07/2009 01:06:39 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Hp 8921a test set Any handheld or mobile radio will work. A scanner would even be appropriate. Scott Scott Zimmerman Amateur Radio Call N3XCC 474 Barnett Road Boswell, PA 15531 kerinvale wrote: Ill try that .which is ht you refer to Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au http://www.kerinvalecomaudio.com.au/ /---Original Message---/ /*From:*/ Scott Zimmerman mailto:n3...@repeater-builder.com /*Date:*/ 30/07/2009 11:08:31 /*To:*/ Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com /*Subject:*/ Re: [Repeater-Builder] Hp 8921a test set Ian, I did the same thing. (easy to do isn't it!!) I ran the internal tests before and after the repairs and there was a significant difference. That's what I did to be sure it was working OK. I must admit, it's probably not as good as sending it somewhere for calibration, but on a ham budget, it works OK enough. You could always hook your HT to the I/O port and check sensitivity then connect it to the duplex port and see if it's about the same. That's a REAL easy benchmark. Scott Scott Zimmerman Amateur Radio Call N3XCC 474 Barnett Road Boswell, PA 15531 kerinvale wrote: I accidently hooked up my test leads to my 8921a wrong and introduced high Watts into the duplex out socket .Removed the a23 module and found the cr203 And cr501 burnt out in the duplex switch .I have replaced them and the unit Seems to be working again .Can anyone suggest simple ways to check the Duplex and ant in section to make sure there isn't any more parts damaged . Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au http://www.kerinvalecomaudio.com.au/ http://www.kerinvalecomaudio.com.au/ -- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.392 / Virus Database: 270.13.35/2271 - Release Date: 07/29/09 18:07:00 -- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.392 / Virus Database: 270.13.35/2271 - Release Date: 07/29/09 18:07:00
Re: [Repeater-Builder] Maxon sm4450sc
Hi guys .thanks for the replys .The fault was I had too much length between the radio and the ctcss decoder card .I have altered most of my repeaters to allow the maxons to decode the signal by itself and then it controls the transmitter by the maxon approved design with a bs170 fet .I have now developed a interface circuit that has no relays for switching audio .and the new design uses a 4066 audio IC to switch audio paths .It has reduced transmitting delays very well .Now the repeaters seem to work almost as soon as a signal comes in .One repeater decodes even if the signal is just below the mute .I need to find out how that one works.All in all very happy I have found the problem .Now I have repeaters with no ctcss breakup. Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: kerinvale Date: 11/07/2009 02:18:36 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Maxon sm4450sc Thanks for the reply Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: Razvan Daniel Date: 10/07/2009 21:57:50 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Maxon sm4450sc Hey, You can use the external card, just shield it as well as possible by placeing it into a metal grounded case and using double or triple shieldee coaxial condutors to link it to the radio. This wil prevent any interference from dispurbing the useful signals. This having said, please take into consideration that if the TX antenna is at least several meters away then you should check the feeder, connectors and antenna reflected wave, since this diturbance should not normlly happen in good configuration. I have also noticed that for some reason, the internal decoder takes a wihile to react to the carier CTSS signal. It may be a design glitch or it may be possible that a optional delay might exist via software. I never checked. For these reasons, I think the external card is best. Regards, Buie Daniel Razvan RADIOCOM Bihor 004 741 133740 buie.raz...@radiotelecomunicatii.ro www.radiotelecomunicatii.ro --- On Fri, 7/10/09, kerinvale kerin...@pacific.net.au wrote: From: kerinvale kerin...@pacific.net.au Subject: [Repeater-Builder] Maxon sm4450sc To: Repeater-Builder@yahoogroups.com Date: Friday, July 10, 2009, 4:35 AM Hi guys .I have a maxon sm4450sc that is setup for rx ctcss decode in a repeater and it is decoding ctcss ok but it only activates the call led when the signal is over the squelch level. I am wondering is there a way that the radio decoder can be on all the time so even if the signal is below the squelch the radio will activate the call led without affecting the audio squelch level. I tried to use ctcss external decoder card and they work great with direct connection to the receiver audio out from the detector but as I have found out recently with the cards outside the radio they are affected badly with rf when the transmitter is activated if the leads are too long so I have setup the radio to decode the ctcss and this is working well but it is slow to activate the repeater.I am trying to set the receiver up that it will decode as soon as the signal is present instead of it needing it to be over the squelch level before decoding. Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela. 4715 Phone 0749922574 or 0409159932 www.kerinvalecomaud io.com.au
Re: [Repeater-Builder] Hp 8921a test set
I followed the unit test procedure and it failed on filter output detector output variable att,auto range att,duplex detector(no signal) Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: Scott Zimmerman Date: 31/07/2009 01:06:39 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Hp 8921a test set Any handheld or mobile radio will work. A scanner would even be appropriate. Scott Scott Zimmerman Amateur Radio Call N3XCC 474 Barnett Road Boswell, PA 15531 kerinvale wrote: Ill try that .which is ht you refer to Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au http://www.kerinvalecomaudio.com.au/ /---Original Message---/ /*From:*/ Scott Zimmerman mailto:n3...@repeater-builder.com /*Date:*/ 30/07/2009 11:08:31 /*To:*/ Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com /*Subject:*/ Re: [Repeater-Builder] Hp 8921a test set Ian, I did the same thing. (easy to do isn't it!!) I ran the internal tests before and after the repairs and there was a significant difference. That's what I did to be sure it was working OK. I must admit, it's probably not as good as sending it somewhere for calibration, but on a ham budget, it works OK enough. You could always hook your HT to the I/O port and check sensitivity then connect it to the duplex port and see if it's about the same. That's a REAL easy benchmark. Scott Scott Zimmerman Amateur Radio Call N3XCC 474 Barnett Road Boswell, PA 15531 kerinvale wrote: I accidently hooked up my test leads to my 8921a wrong and introduced high Watts into the duplex out socket .Removed the a23 module and found the cr203 And cr501 burnt out in the duplex switch .I have replaced them and the unit Seems to be working again .Can anyone suggest simple ways to check the Duplex and ant in section to make sure there isn't any more parts damaged . Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au http://www.kerinvalecomaudio.com.au/ http://www.kerinvalecomaudio.com.au/ -- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.392 / Virus Database: 270.13.35/2271 - Release Date: 07/29/09 18:07:00 -- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.392 / Virus Database: 270.13.35/2271 - Release Date: 07/29/09 18:07:00
[Repeater-Builder] Hp 8921a test set
I accidently hooked up my test leads to my 8921a wrong and introduced high Watts into the duplex out socket .Removed the a23 module and found the cr203 And cr501 burnt out in the duplex switch .I have replaced them and the unit Seems to be working again .Can anyone suggest simple ways to check the Duplex and ant in section to make sure there isn't any more parts damaged . Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
Re: [Repeater-Builder] Hp 8921a test set
Ill try that .which is ht you refer to Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: Scott Zimmerman Date: 30/07/2009 11:08:31 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Hp 8921a test set Ian, I did the same thing. (easy to do isn't it!!) I ran the internal tests before and after the repairs and there was a significant difference. That's what I did to be sure it was working OK. I must admit, it's probably not as good as sending it somewhere for calibration, but on a ham budget, it works OK enough. You could always hook your HT to the I/O port and check sensitivity then connect it to the duplex port and see if it's about the same. That's a REAL easy benchmark. Scott Scott Zimmerman Amateur Radio Call N3XCC 474 Barnett Road Boswell, PA 15531 kerinvale wrote: I accidently hooked up my test leads to my 8921a wrong and introduced high Watts into the duplex out socket .Removed the a23 module and found the cr203 And cr501 burnt out in the duplex switch .I have replaced them and the unit Seems to be working again .Can anyone suggest simple ways to check the Duplex and ant in section to make sure there isn't any more parts damaged Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au http://www.kerinvalecomaudio.com.au/ -- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.392 / Virus Database: 270.13.35/2271 - Release Date: 07/29/09 18:07:00
[Repeater-Builder] Gme answer to Australia's uhf CB 40ch
Hi guys .Our acma wishes to upgrade our current 40ch uhf from 25khz to 12.5 khz spacing here is the gme answer to this this change http://www.acma.gov.au/webwr/_assets/main/lib310903/gme_ifc-08-2009.pdf Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
[Repeater-Builder] Maxon sm4450sc
Hi guys .I have a maxon sm4450sc that is setup for rx ctcss decode in a repeater and it is decoding ctcss ok but it only activates the call led when the signal is over the squelch level. I am wondering is there a way that the radio decoder can be on all the time so even if the signal is below the squelch the radio will activate the call led without affecting the audio squelch level. I tried to use ctcss external decoder card and they work great with direct connection to the receiver audio out from the detector but as I have found out recently with the cards outside the radio they are affected badly with rf when the transmitter is activated if the leads are too long so I have setup the radio to decode the ctcss and this is working well but it is slow to activate the repeater.I am trying to set the receiver up that it will decode as soon as the signal is present instead of it needing it to be over the squelch level before decoding. Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
Re: [Repeater-Builder] Maxon sm4450sc
Thanks for the reply Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: Razvan Daniel Date: 10/07/2009 21:57:50 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Maxon sm4450sc Hey, You can use the external card, just shield it as well as possible by placeing it into a metal grounded case and using double or triple shieldee coaxial condutors to link it to the radio. This wil prevent any interference from dispurbing the useful signals. This having said, please take into consideration that if the TX antenna is at least several meters away then you should check the feeder, connectors and antenna reflected wave, since this diturbance should not normlly happen in good configuration. I have also noticed that for some reason, the internal decoder takes a wihile to react to the carier CTSS signal. It may be a design glitch or it may be possible that a optional delay might exist via software. I never checked. For these reasons, I think the external card is best. Regards, Buie Daniel Razvan RADIOCOM Bihor 004 741 133740 buie.raz...@radiotelecomunicatii.ro www.radiotelecomunicatii.ro --- On Fri, 7/10/09, kerinvale kerin...@pacific.net.au wrote: From: kerinvale kerin...@pacific.net.au Subject: [Repeater-Builder] Maxon sm4450sc To: Repeater-Builder@yahoogroups.com Date: Friday, July 10, 2009, 4:35 AM Hi guys .I have a maxon sm4450sc that is setup for rx ctcss decode in a repeater and it is decoding ctcss ok but it only activates the call led when the signal is over the squelch level. I am wondering is there a way that the radio decoder can be on all the time so even if the signal is below the squelch the radio will activate the call led without affecting the audio squelch level. I tried to use ctcss external decoder card and they work great with direct connection to the receiver audio out from the detector but as I have found out recently with the cards outside the radio they are affected badly with rf when the transmitter is activated if the leads are too long so I have setup the radio to decode the ctcss and this is working well but it is slow to activate the repeater.I am trying to set the receiver up that it will decode as soon as the signal is present instead of it needing it to be over the squelch level before decoding. Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela. 4715 Phone 0749922574 or 0409159932 www.kerinvalecomaud io.com.au
[Repeater-Builder] Ctcss dropout due to loud voice
Hi guys .Can anyone suggest ways to reduce ctcss dropout when someone is talking loud on a repeater .The repeater radios are maxon pm150 (sm4450sc) and I have tuned them using 600hz of ctcss and a 1khz tone at 3khz modulation to make sure it doesn't happen ,but I have one user that talks louder than the other users and it seems to breakup all the time for them where other users seem to have no problems.Could I make sure their ctcss from their maxon pm160 is around 600hz or 700hz or could the problem be more tied up with the receiving repeater radio Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
Re: [Repeater-Builder] Ctcss dropout due to loud voice
Thanks .These maxons pm160 are straight from the makers and the deviation hasn't been touched but I will check this radio on our service monitor and see how it goes. Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: Kris Kirby Date: 7/07/2009 07:40:08 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Ctcss dropout due to loud voice On Tue, 7 Jul 2009, kerinvale wrote: Hi guys .Can anyone suggest ways to reduce ctcss dropout when someone is talking loud on a repeater .The repeater radios are maxon pm150 (sm4450sc) and I have tuned them using 600hz of ctcss and a 1khz tone at 3khz modulation to make sure it doesn't happen ,but I have one user that talks louder than the other users and it seems to breakup all the time for them where other users seem to have no problems.Could I make sure their ctcss from their maxon pm160 is around 600hz or 700hz or could the problem be more tied up with the receiving repeater radio Your user is over-deviating. Reduce the deviation in his radio, or tell him not to yell into the mic. The dropout is because his signal is passing outside of the receiver's bandpass. -- Kris Kirby, KE4AHR Disinformation Analyst
RE: [Repeater-Builder] Ctcss dropout due to loud voice
Thanks guys .I will check these out and let you know what I find Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: Eric Lemmon Date: 7/07/2009 10:40:41 To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Ctcss dropout due to loud voice Ian, I suspect that the problem is talk off caused by overdeviation of the mike audio. When the CTCSS tone is mixed with the mike audio prior to the deviation limiter stage, an excessive voice signal will be hard limited along with the CTCSS tone, causing a distorted signal. This problem occurs quite often in Amateur-grade equipment, since the makers often have very hot tone deviation that is set with a fixed resistor rather than adjustable as in most commercial-grade radios. Alinco, Icom, and Yaesu handhelds seem to have this problem all the time. Every Alinco handheld I've tested has a PL deviation above 1 kHz, and a few samples were up to 1.5 kHz- about three times the necessary amount. Needless to say, a tone deviation of 1.5 kHz doesn't leave much room for voice deviation, and all it takes is a loud talker to cause the limiter to squash the modulating signal and distort the CTCSS tone enough for the repeater to drop. It's not easy, but I have padded the CTCSS tone circuit in several Alinco and Yaesu radios to reduce the level to less than 500 Hz deviation, and that cures the problem. Most modern repeaters can detect a tone as low as 100 Hz deviation, so setting the tone between 400 and 500 Hz should work fine. Of course, there are diddle-stick artists who can't resist cranking up the mike gain pot so that they will sound better (they think) and make the problem worse. In order to stay within a 16K0F3E emission envelope, the total deviation should be limited to around 4.8 kHz. Most commercial-grade radios reduce the voice gain when a tone is added, but cheap radios aren't that smart. If the total deviation is limited to, say, 4.8 kHz, but a tone is not used, the voice deviation will sound softer. I suspect that the diddle-stick artist cranks up the gain to offset that low level. I suggest that you set the CTCSS deviation to 500 Hz, and ensure that the deviation limiter is set no higher than 5.0 kHz. See if that reduces or eliminates the talk-off problems. The Maxon service manual should have a procedure for mike gain and limiter setting, which should be followed. The fact that only some users have the problem strongly points to the user radios, rather than the repeater. Also, ensure that the problem radios are exactly on frequency. Please keep this list informed as to your findings and progress. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of kerinvale Sent: Monday, July 06, 2009 2:33 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Ctcss dropout due to loud voice Hi guys .Can anyone suggest ways to reduce ctcss dropout when someone is talking loud on a repeater .The repeater radios are maxon pm150 (sm4450sc) and I have tuned them using 600hz of ctcss and a 1khz tone at 3kHz modulation to make sure it doesn't happen ,but I have one user that talks louder than the other users and it seems to breakup all the time for them where other users seem to have no problems.Could I make sure their ctcss from their maxon pm160 is around 600hz or 700hz or could the problem be more tied up with the receiving repeater radio Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au http://www.kerinvalecomaudio.com.au/ http://geo.yahoo.com/serv?s=97359714/grpId=104168/grpspId=1705063108/msgId= 92448/stime=1246912865/nc1=5349274/nc2=5741391/nc3=4025338
[Repeater-Builder] Circuit diagram for interfacing 2 maxon pm150 repeaters together
Would anyone have a simple diagram for joining 2 separate maxon sm4450 repeaters together in real time I.e. Rx1 --+---tx1 I Rx2--+tx2 So what is received from rx1 transmitts to tx1 and TX 2 and what is received from rx2 goes over tx1 and tx2 Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
Re: [Repeater-Builder] Circuit diagram for interfacing 2 maxon pm150 repeaters together
Is there a diagram available .over here I am currently using a sm4450 repeater modification diagram using 2 separate bs170 and transistor to switch 2 relays which control the ptt on both repeaters but I feel it is too slow .Also I find the ctcss is a little slow to detect the tone are there any inmprovements that can improve the detect time? Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: Gareth Bennett \(Ihug\) Date: 12/06/2009 23:08:22 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Circuit diagram for interfacing 2 maxon pm150 repeaters together Hi Ian, How about building a 3 way 600Z resistive bridge with 7x 220R resistors, feeding each TX into two of the three ports and utilising the last port for either RX1 or RX2, which is switched into the remaining port via the active RX COS control driving into a DPST relay to select the active RX? ... Simple and it works . Cheers Gareth Bennett From: kerinvale To: Repeater-Builder@yahoogroups.com Sent: Saturday, June 13, 2009 12:31 AM Subject: [Repeater-Builder] Circuit diagram for interfacing 2 maxon pm150 repeaters together Would anyone have a simple diagram for joining 2 separate maxon sm4450 repeaters together in real time I.e. Rx1 --+---tx1 I Rx2--+tx2 So what is received from rx1 transmitts to tx1 and TX 2 and what is received from rx2 goes over tx1 and tx2 Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
Re: [Repeater-Builder] Maxon Sm4450sc ctcss
Thanks it worked . with our radios over here .the ones that have the 93C46 EPROM it works wether the mic is plugged in or not Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: kerinvale Date: 4/06/2009 15:15:19 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Maxon Sm4450sc ctcss Does that mute the radio.ill try it Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: Jim WB5OXQ inb Waco, TX Date: 4/06/2009 14:51:44 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Maxon Sm4450sc ctcss Do you have the microphone hanger grounded? - Original Message - From: kerinvale To: Repeater-Builder@yahoogroups.com Sent: Wednesday, June 03, 2009 11:44 PM Subject: [Repeater-Builder] Maxon Sm4450sc ctcss Hi guys .I have purchased a sm4450sc from the us with a 93C56 eprom.I have programmed the eprom with the sm4000 programer (sm4450-ex) with a ctcss channel.The squelch is operating ok but with the ctcss it isn't muting the audio.When a non-ctcss signal is applied the audio still comes through .When a ctcss signal is applied the call light comes on but the audio doesn't mute when its removed .Link 1 and 2 have been linked as per manual. can anyone suggest any more I need to check . Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
[Repeater-Builder] Maxon Sm4450sc ctcss
Hi guys .I have purchased a sm4450sc from the us with a 93C56 eprom.I have programmed the eprom with the sm4000 programer (sm4450-ex) with a ctcss channel.The squelch is operating ok but with the ctcss it isn't muting the audio.When a non-ctcss signal is applied the audio still comes through .When a ctcss signal is applied the call light comes on but the audio doesn't mute when its removed .Link 1 and 2 have been linked as per manual. can anyone suggest any more I need to check . Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
Re: [Repeater-Builder] Maxon Sm4450sc ctcss
Does that mute the radio.ill try it Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: Jim WB5OXQ inb Waco, TX Date: 4/06/2009 14:51:44 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Maxon Sm4450sc ctcss Do you have the microphone hanger grounded? - Original Message - From: kerinvale To: Repeater-Builder@yahoogroups.com Sent: Wednesday, June 03, 2009 11:44 PM Subject: [Repeater-Builder] Maxon Sm4450sc ctcss Hi guys .I have purchased a sm4450sc from the us with a 93C56 eprom.I have programmed the eprom with the sm4000 programer (sm4450-ex) with a ctcss channel.The squelch is operating ok but with the ctcss it isn't muting the audio.When a non-ctcss signal is applied the audio still comes through .When a ctcss signal is applied the call light comes on but the audio doesn't mute when its removed .Link 1 and 2 have been linked as per manual. can anyone suggest any more I need to check . Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
[Repeater-Builder] UHF CB goes to 60 channels 12.5khz
Hey guys .You think your FCC is entertaining try the suggested band plan to replace our uhf CB in Australia .All 40 channels are currently 25khz from 476.425 ch1 to 476.400 ch 40 .below is the new suggested plan in possibly the next 5 years. CB is going to 60 channels see ACMA: http://www.acma.gov.au/WEB/STANDARD/pc=PC_311684 Channel plan here: Http://www.users.bigpond.com/rsawday//UHFCB.doc Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
RE: [Repeater-Builder] Re: Quieting duplex noise from a tower
We went the other way and earthed all guy wires with short wires connected back to the tower and have had no problems with static in windy weather Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: Michael Ryan Date: 03/13/09 08:13:06 To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Quieting duplex noise from a tower I have far less experience with this sort of thing than most anyone here but IMHO towers that are guyed SHOULD have insulators breaking up the guy wires, as close to the tower as possible, and at least one per guy wire. The guy wires that were installed on the tower where my repeater is installed MOVE ever so slightly on windy days. When the wires move you get static from the metal on metal surfaces. We broke the wires with JUST ONE insulator per leg and the noise we were getting on windy days disappeared. -MIke From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups com] On Behalf Of hankjr...@aol.com Sent: Thursday, March 12, 2009 4:59 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Quieting duplex noise from a tower Sorry, I have the same problem with my repeater on a 100 foot tower guyed with 3/16 cable. It seems when the temp drops below 60 F I get a squeal in the RX side of my repeater. I can shake the tower when its doing it and it will go away for a few minutes. We went up and grounded the antenna and bracket to the tower. I thought we were getting RX noise from a bad connection that would get worse when the temp dropped due to the metal shrinking. Still no luck fixing it. I'm not sure what to do now. 73, KD5UZA In a message dated 3/12/2009 3:39:30 P.M. Central Daylight Time, paul_n1...@myfairpoint.net writes: Hi Randy, I remember working you on 2 meters. That is very interesting. I tried bonding all the joints. If anything it actually seemed to make things worse!? I have been seriously thinking about Phillystran. It's a big expense not knowing for sure where the problem lies, but the only way to find out may be to try it and see! Paul wb8art wrote: Hello Paul, Worked you a few times many moons ago. I would agree with Jeff with tapping and slightly causing movement with the repeater up with a weak signal. I have before experiened both an antenna (stationmaster) with internal broken joint which caused severe noise and desense but also dependent on movement in the structure. Also have seen with a 100ft. guyed 3/36 town like yours having the same issue. I tried grounding bonding all joints on guys to tower and between tower sections to no avail. Also tried isolating the preforms from tower and bottom supports with no change. I decided that the 3/16 stranded was the generation source. We changed the guys to Phillystran and never had another issue. Need a job? Find employment help in your area. __ NOD32 3931 (20090312) Information __ This message was checked by NOD32 antivirus system. http://www.eset.com
RE: [Repeater-Builder] Re: Quieting duplex noise from a tower
The tower is all steel so why wont the lightning hit the entire tower and guy ropes .Wether they are shorted to the tower or not a lightning hit will run through all the setup.I have had a VHF antenna hit with lightning and the tower was a1 ok and the antenna was blowen to pieces .All commercial communication towers here in aus are done with big earthing straps into the ground especially the anchors that are in concrete. Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: Nate Duehr Date: 13/03/2009 10:18:50 To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Quieting duplex noise from a tower This fixes the RF problem, but creates a new one the guy anchors can now explode in a direct lightning strike if your shorting wires dont give up first if the lightning thinks the path down the guy wire looks better than others Nate WY0X From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups com] On Behalf Of kerinvale Sent: Thursday, March 12, 2009 4:28 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Quieting duplex noise from a tower
