Re: [Repeater-Builder] Two CTCSS Tones out of One TX
If nothing else, be certain both tones are not distorted. Neil - WA6KLA Original Message From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Two CTCSS Tones out of One TX Date: Fri, 21 Apr 2006 18:20:43 -0700 (PDT) You will likely end up with an audible sound by using two signals at the same time. Let's say you use 77.0 Hz and 192.8 Hz. These are unrelated but you will still get the sum and difference frequencies coming out, which would give you around 115 Hz and 269 Hz. You might hear the one at 269. If you used two signals that were much closer, you could hear a slow beat note. Also, depending on the kind of decoders you use, they may not be happy seeing another sub-audible tone present along with the desired one. After saying this, I bet someone will come along and tell you that it will work, and how to do it! Bob M. == --- Kevin Natalia Mitchell [EMAIL PROTECTED] wrote: Hi All, I am wanting to use one TX from our repeater site, to link to two link RX's, these are on opposite sides of the repeater. I was thinking about having two different CTCSS tones, one for each, and then having the TX generate the two tones together. This way I can use one freq., but still have some form of control over the links by switching either, or both CTCSS tones off/on as required. Any ideas, or comments on this setup would be helpful Regards Kev. __ 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/
[Repeater-Builder] Duplexer Wanted
We are looking for a Mobile type duplexer for a portable Repeater. tuned to 147.015 tx and 147.615 rx If anyone has one or knows where we can get one please let me know, Thanks Randy 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: That horrible noise
--- In Repeater-Builder@yahoogroups.com, Ken Arck [EMAIL PROTECTED] wrote: At 08:58 PM 4/21/2006 -0400, you wrote: You wouldnt hear the sync buzz,your rx is to narrow! --I ABSOLUTE disagree with this. You can easily hear sync buzz on a NBFM receiver. I know. The narrow bandwidth dosen't prevent a smeared narrowband version coming through. 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] Two CTCSS Tones out of One TX
Hi All, I am wanting to use one TX from our repeater site, to link to two link RX's, these are on opposite sides of the repeater. I was thinking about having two different CTCSS tones, one for each, and then having the TX generate the two tones together. This way I can use one freq., but still have some form of control over the links by switching either, or both CTCSS tones off/on as required. Any ideas, or comments on this setup would be helpful Regards Kev. As has been pointed out, there are some problems with running two different PL tones at the same time, both on the TX and at the RX sites. It can be done, but it also can have some problems. Here is a thought, a possible solution to the problem. Run a single tone at the TX site, but selectable from 3 choices, say 100.0, 107.2, and 114.8. This can easily be done by diode switching on a Comm-Spec or similiar type encoder. At each RX site, have 2 decoders, one set to a common tone, maybe 100.0. When this PL is selected, both sites will be active. At site A, there will also be a parallel decoder on 107.2, and at site B there will be a parallel decoder on 114.8. So to run both sites, 100.0 is selected at the TX site. For site A only, run 107.2, and for site B only, run 114.8. This solution will cost a little more, but will be much easier to implement and keep running without problems, using any type of decoder. Joe __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com 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] Duplexer Wanted
At 4/22/2006 08:11, you wrote: We are looking for a Mobile type duplexer for a portable Repeater. tuned to 147.015 tx and 147.615 rx If anyone has one or knows where we can get one please let me know, Thanks Doesn't exist. Mobile VHF duplexers will not work below ~2.5 MHz split. Best you're going to do size-wise is the Sinclair Q2220 series, but the spec is only 70 dB of isolation, not enough for a 600 kHz split. The one I had had adjustable loops, so I was able to get ~90 dB out of it after taking an extra 1 dB loss hit (2 to 2.5 dB total loss IIRC the notches are VERY narrow). At 28 pounds, not exactly portable either but will fit in a car trunk nicely. Bob NO6B 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] Duplexer Wanted
Thanks Bob for the info Randy 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] Duplexer Wanted
Randy, You won't find such a duplexer for a 600 kHz split. Mobile duplexers are notch-only, with no bandpass action at all. As such, they are almost useless for anything below a 5 MHz split. Even the larger compact base station duplexers such as the Celwave 5085 series are generally no good below a 3 MHz split. One of my local ARES groups has a portable 2m repeater that uses a Telewave TPRD-1454, 4-cavity Bp/Br duplexer that works fine with the low-power Hamtronics repeater. It's built into a foot-locker sort of wooden box that can be carried by two men- more like transportable than portable. My CommShop program calls for about 77 dB of isolation between a 5 watt transmitter and a 0.35 uV receiver at a 600 kHz split, and this is exactly the specification of the TPRD-1454 duplexer. For 10 watts TX power, you'll need about 80 dB of isolation. At 2m, a very small duplexer is simply not practical. The 2m coordination group in my area of California, TASMA, wisely set aside one wide-spaced frequency pair for short-term portable repeater usage. This pair is 147.585 MHz input and 144.930 MHz output, for a split of 2.655 MHz. This is within the capability of a Celwave 5085-1 compact base station duplexer, when ordered tuned on this pair from the factory. I am assembling a portable repeater using this duplexer and a Motorola R1225 10-watt full-duplex radio. The entire repeater fits into a case that is less than one cubic foot in volume and can be carried with one hand. The Celwave 5085 duplexer is about 50% larger than a typical mobile duplexer, and it comes in models for both 3 MHz and 5 MHz splits. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Randy Sent: Saturday, April 22, 2006 8:12 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Duplexer Wanted We are looking for a Mobile type duplexer for a portable Repeater. tuned to 147.015 tx and 147.615 rx. If anyone has one or knows where we can get one please let me know, Thanks Randy 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] Duplexer Wanted
Make your life easy, build a 440 Mhz repeater and tie a 2 meter simplex receiver into it and you will have all that you need. This is what I am going to do with the mobile command center that I am putting together. The UHF all fits into a small cabinet and you won't need much of a transmitter on two meters, about 25 watts will do. Mathew Eric Lemmon [EMAIL PROTECTED] wrote: Randy,You won't find such a duplexer for a 600 kHz split. Mobile duplexers arenotch-only, with no bandpass action at all. As such, they are almostuseless for anything below a 5 MHz split. Even the larger "compact basestation duplexers" such as the Celwave 5085 series are generally no goodbelow a 3 MHz split.One of my local ARES groups has a "portable" 2m repeater that uses aTelewave TPRD-1454, 4-cavity Bp/Br duplexer that works fine with thelow-power Hamtronics repeater. It's built into a foot-locker sort of woodenbox that can be carried by two men- more like transportable than portable.My CommShop program calls for about 77 dB of isolation between a 5 watttransmitter and a 0.35 uV receiver at a 600 kHz split, and this is exactlythe specification of the TPRD-1454 duplexer. For 10 watts TX power, you'llneed about 80 dB of isolation. At 2m, a very small duplexer is simply notpractical.The 2m coordination group in my area of California, TASMA, wisely set asideone wide-spaced frequency pair for short-term portable repeater usage. Thispair is 147.585 MHz input and 144.930 MHz output, for a split of 2.655 MHz.This is within the capability of a Celwave 5085-1 compact base stationduplexer, when ordered tuned on this pair from the factory. I am assemblinga portable repeater using this duplexer and a Motorola R1225 10-wattfull-duplex radio. The entire repeater fits into a case that is less thanone cubic foot in volume and can be carried with one hand. The Celwave 5085duplexer is about 50% larger than a typical mobile duplexer, and it comes inmodels for both 3 MHz and 5 MHz splits.73, Eric Lemmon WB6FLY-Original Message-From: Repeater-Builder@yahoogroups.com[mailto:[EMAIL PROTECTED] On Behalf Of RandySent: Saturday, April 22, 2006 8:12 AMTo: Repeater-Builder@yahoogroups.comSubject: [Repeater-Builder] Duplexer WantedWe are looking for a Mobile type duplexer for a portable Repeater. tuned to 147.015 tx and 147.615 rx. If anyone has one or knows where we can get one please let me know, ThanksRandyYahoo! Groups LinksYahoo! 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! Messenger with Voice. Make PC-to-Phone Calls to the US (and 30+ countries) for 2ยข/min or less. 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] Duplexer Wanted
Hello Randy, With only 25 watts, the other option is to use two antennas with some separation. And it is also helpful to add a filter to the transmit line and another to the receiver. At least add one to the transmit side. Adding a filter to the transmit side would help eliminate the high power interference, and no loss for the receiver. And of course PL on your receiver would help too. I've been running a 35 watt repeater with two antennas and a transmit filter for more than a year and it works just fine. Mick - W7CAT Be sure to check out all the latest at http://www.wyocat.com/tarra Randy wrote: Hi Eric and others, Thanks for the info. We are wanting something portable but not as to carry them around. Just something we can transport with out to much trouble, The repeater puts out about 25 watts. I guess thats why most use UHF gear for this. Randy - Original Message - From: "Eric Lemmon" [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Saturday, April 22, 2006 12:34 PM Subject: RE: [Repeater-Builder] Duplexer Wanted Randy, You won't find such a duplexer for a 600 kHz split. Mobile duplexers are notch-only, with no bandpass action at all. As such, they are almost useless for anything below a 5 MHz split. Even the larger "compact base station duplexers" such as the Celwave 5085 series are generally no good below a 3 MHz split. One of my local ARES groups has a "portable" 2m repeater that uses a Telewave TPRD-1454, 4-cavity Bp/Br duplexer that works fine with the low-power Hamtronics repeater. It's built into a foot-locker sort of wooden box that can be carried by two men- more like transportable than portable. My CommShop program calls for about 77 dB of isolation between a 5 watt transmitter and a 0.35 uV receiver at a 600 kHz split, and this is exactly the specification of the TPRD-1454 duplexer. For 10 watts TX power, you'll need about 80 dB of isolation. At 2m, a very small duplexer is simply not practical. The 2m coordination group in my area of California, TASMA, wisely set aside one wide-spaced frequency pair for short-term portable repeater usage. This pair is 147.585 MHz input and 144.930 MHz output, for a split of 2.655 MHz. This is within the capability of a Celwave 5085-1 compact base station duplexer, when ordered tuned on this pair from the factory. I am assembling a portable repeater using this duplexer and a Motorola R1225 10-watt full-duplex radio. The entire repeater fits into a case that is less than one cubic foot in volume and can be carried with one hand. The Celwave 5085 duplexer is about 50% larger than a typical mobile duplexer, and it comes in models for both 3 MHz and 5 MHz splits. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com] On Behalf Of Randy Sent: Saturday, April 22, 2006 8:12 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Duplexer Wanted We are looking for a Mobile type duplexer for a portable Repeater. tuned to 147.015 tx and 147.615 rx. If anyone has one or knows where we can get one please let me know, Thanks Randy 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/ __ NOD32 1.1501 (20060421) Information __ This message was checked by NOD32 antivirus system. http://www.eset.com 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] Two CTCSS Tones out of One TX
How about making it even easier? Just connect the switch outputs of your controller to the encoder dip switch, and then you can easily turn on the tone decode you need with the controller, either automatically or manually. Mick - W7CAT Be sure to check out all the latest at http://www.wyocat.com/tarra Here is a thought, a possible solution to the problem. Run a single tone at the TX site, but selectable from 3 choices, say 100.0, 107.2, and 114.8. This can easily be done by diode switching on a Comm-Spec or similiar type encoder. At each RX site, have 2 decoders, one set to a common tone, maybe 100.0. When this PL is selected, both sites will be active. At site "A", there will also be a parallel decoder on 107.2, and at site "B" there will be a parallel decoder on 114.8. So to run both sites, 100.0 is selected at the TX site. For site "A" only, run 107.2, and for site "B" only, run 114.8. This solution will cost a little more, but will be much easier to implement and keep running without problems, using any type of decoder. Joe __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com 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/ __ NOD32 1.1501 (20060421) Information __ This message was checked by NOD32 antivirus system. http://www.eset.com 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.
[Repeater-Builder] MCR 100
A question for the Motorola folks MCR 100 450-470 repeater, I think the combo is D34MJA7304BK. Will it program to tx442 and rx447? Thanks Ted W3VG 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] 6mtr duplexer
Hi Guys have finaly found a source of some LDF750 Heliax, so will have a go at making a 6mtr duplexer. Can anyone point me to a source of good clear diagrams. 73 Steve 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] Sinclair Q 202G Tuning Problem
Jim, Sinclair makes two harness assemblies for that duplexer. The jumpers are about two inches longer in the low-range harness, and that makes a world of difference. You can order the low-split harness directly from Sinclair. Go to: www.sinctech.com Make it very clear that you want the low range harness, as some of the Sinclair sales folk seemed to be unaware of its availability, the last time I called them. A year or so ago, that harness cost about $145. It's all in one piece, with crimped connections. As I recall, the low range was for 136-150 MHz, and the high range was for 150-174 MHz. Most Bp/Br cavities will have one notch above and one notch below the pass frequency. I have tuned several Sinclair duplexers of this design, and they all tuned up perfectly once the correct harness was installed. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Jim Brown Sent: Saturday, April 22, 2006 2:10 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Sinclair Q 202G Tuning Problem I am trying to move a Q-202G from the 170 MHz range down to the 147 MHz range and have run into a problem on the notch tuning. The high pass tuning works like a charm and has a good pass and notch characteristic. The low pass side is another story. The pass tuning works fine, but I can't get a notch. With the tuning rods all the way in, it is starting to notch, but only about 20 db. Here is the strange thing - I took the coupling loop out of the high pass side and compared it to the low pass side, and they are identical. The tuning rod varies the capacitance across the single loop connector and there is no inductance in the circuit for either high pass or low pass side. How does the same hookup work to allow a notch on the low side as well as the high side? I am tempted to add a small fixed capacitance across the loop to see if that helps the tuning for the low pass side.. Any comments on which way to go? 73 - Jim W5ZIT 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] April AGL Digital issue- several good articles
Yes, a good magazine ... Neil Original Message From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] April AGL Digital issue- several good articles Date: Mon, 17 Apr 2006 14:05:12 -0400 Begging the list owners pardon, I noticed several articles in Rich Biby's rag this month that address multiple discussions that occurred recently.. grounding, selecting poly-phasors, phased antenna systems and batteries.. etc.. So I figured it couldn't hurt to pass the link along to the rest of the group. I have no ties to the magazine, other than I occasionally work Rich during the VHF and up contests and have known him for over a decade. 73 Mike Perryman www.k5jmp.us Subject: Your April AGL Digital issue has been delivered http://www.qmags.com/agl; April Highlights include: RF Hazard Protection Equipment Best Practices, Batteries and Backup Power Systems Cells Within Cells Generating Some Respect Grounding Practices for Wireless Telecom Sites Selecting Coaxial Lightning Protectors Strike Out Lightning With Single-point Grounding Accident Investigations: A Means to Improve Safety 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] Sinclair Q 202G Tuning Problem
What you are experiencing is the symptioms of insufficient capacity to pull the notch down low enough on the low pass side. The capacity range of those tuning stubs is determined by the length of the center rod inside the plastic stub. They are 3/16 (I think) diameter brass rod with a threaded end. Sinclair had several lengths available, the longest one being about 6in long. There is probably nobody left at Sinclair that even remembers that part as that design dates back to the 1950s or 60s and was superseded by the Johanson trimmer design in the late 1960s. You should be able to get a local machinist to make you a longer one using the one you have as an example. Burt VE2BMQ Jim Brown wrote: I am trying to move a Q 202 G from the 170 mHz range down to the 147 mHz range and have run into a problem on the notch tuning. The high pass tuning works like a charm and has a good pass and notch characteristic. The low pass side is another story. The pass tuning works fine, but I can't get a notch. With the tuning rods all the way in, it is starting to notch, but only about 20 db. Here is the strange thing - I took the coupling loop out of the high pass side and compared it to the low pass side, and they are identical. The tuning rod varies the capacitance across the single loop connector and there is no inductance in the circuit for either high pass or low pass side. How does the same hookup work to allow a notch on the low side as well as the high side? I am tempted to add a small fixed capacitance across the loop to see if that helps the tuning for the low pass side.. Any comments on which way to go? 73 - Jim W5ZIT 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] Two CTCSS Tones out of One TX
That is an easy problem to fix, simply make a low pass filter to roll off everything above about 220 HZ. -- Original Message -- Received: Fri, 21 Apr 2006 08:20:49 PM CDT From: Bob M. [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Two CTCSS Tones out of One TX You will likely end up with an audible sound by using two signals at the same time. Let's say you use 77.0 Hz and 192.8 Hz. These are unrelated but you will still get the sum and difference frequencies coming out, which would give you around 115 Hz and 269 Hz. You might hear the one at 269. If you used two signals that were much closer, you could hear a slow beat note. Also, depending on the kind of decoders you use, they may not be happy seeing another sub-audible tone present along with the desired one. After saying this, I bet someone will come along and tell you that it will work, and how to do it! Bob M. == --- Kevin Natalia Mitchell [EMAIL PROTECTED] wrote: Hi All, I am wanting to use one TX from our repeater site, to link to two link RX's, these are on opposite sides of the repeater. I was thinking about having two different CTCSS tones, one for each, and then having the TX generate the two tones together. This way I can use one freq., but still have some form of control over the links by switching either, or both CTCSS tones off/on as required. 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: Sinclair Q 202G Tuning Problem
If the tunable stub is connectorized, then just add a 90 degree connector in line to make it a bit longer. It depends on the version of the old stub Q202 duplexer you have. Is it side mounted or top mounted loops and are there 4 or 8 pieces of coax being used? Is the harness connectorized with separate Ts or is it one assembly? The coax lengths should be a little longer but I think 2 is too much if I remember correctly. You should still be able to make it work with that cable harness. A good working stub Q202 is better than a new Q202 with capacitor loops. Harold, VA3HF --- In Repeater-Builder@yahoogroups.com, Burt Lang [EMAIL PROTECTED] wrote: What you are experiencing is the symptioms of insufficient capacity to pull the notch down low enough on the low pass side. The capacity range of those tuning stubs is determined by the length of the center rod inside the plastic stub. They are 3/16 (I think) diameter brass rod with a threaded end. Sinclair had several lengths available, the longest one being about 6in long. There is probably nobody left at Sinclair that even remembers that part as that design dates back to the 1950s or 60s and was superseded by the Johanson trimmer design in the late 1960s. You should be able to get a local machinist to make you a longer one using the one you have as an example. Burt VE2BMQ Jim Brown wrote: I am trying to move a Q 202 G from the 170 mHz range down to the 147 mHz range and have run into a problem on the notch tuning. The high pass tuning works like a charm and has a good pass and notch characteristic. The low pass side is another story. The pass tuning works fine, but I can't get a notch. With the tuning rods all the way in, it is starting to notch, but only about 20 db. Here is the strange thing - I took the coupling loop out of the high pass side and compared it to the low pass side, and they are identical. The tuning rod varies the capacitance across the single loop connector and there is no inductance in the circuit for either high pass or low pass side. How does the same hookup work to allow a notch on the low side as well as the high side? I am tempted to add a small fixed capacitance across the loop to see if that helps the tuning for the low pass side.. Any comments on which way to go? 73 - Jim W5ZIT 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: Duplexer Wanted
You should use a Q2330E Sinclair duplexer for less loss at 600Khz separation or the Q2220E set at the higher insertion loss to get the deeper notches. There was a re-entrant version of the Q2330E called the Q2332E which is shorter but should be mounted in something to protect both ends of the filter if it is to be moved around allot. I once made a re-entrant short VHF 600KHz split duplexer out of PC Boards from the design publish in QST about 27 years ago but that had about 3 dB loss and was fragile. Harold, VA3HF --- In Repeater-Builder@yahoogroups.com, Randy [EMAIL PROTECTED] wrote: Hi Eric and others, Thanks for the info. We are wanting something portable but not as to carry them around. Just something we can transport with out to much trouble, The repeater puts out about 25 watts. I guess thats why most use UHF gear for this. Randy --- 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: Sinclair Q 202G Tuning Problem
If the tunable stub is connectorized, then just add a 90 degree connector in line to make it a bit longer. No connectors on the tuning stub. The coupling loop is built into the stub and it extends at a right angle from the loop insert. A single N connector opposite the tuning stub couples to the harness. I am not sure if the center conductor inside the notch tube will unscrew from the connector/loop assembly. It looks like it is soldered to the loop and connector. It depends on the version of the old stub Q202 duplexer you have. Is it side mounted or top mounted loops and are there 4 or 8 pieces of coax being used? Is the harness connectorized with separate Ts or is it one assembly? The coax lengths should be a little longer but I think 2 is too much if I remember correctly. You should still be able to make it work with that cable harness. The harness is made up of 8 individual cables with all cables the same length except for one that couples from the junction of the antenna output cable and the receiver connection. (transmitter connection is also longer). I have tried extending the cables with an elbow connector on each of the cavities that won't tune with no change in the tuning characteristics. A good working stub Q202 is better than a new Q202 with capacitor loops. Harold, VA3HF --- In Repeater-Builder@yahoogroups.com, Burt Lang [EMAIL PROTECTED] wrote: What you are experiencing is the symptioms of insufficient capacity to pull the notch down low enough on the low pass side. The capacity range of those tuning stubs is determined by the length of the center rod inside the plastic stub. They are 3/16 (I think) diameter brass rod with a threaded end. Sinclair had several lengths available, the longest one being about 6in long. There is probably nobody left at Sinclair that even remembers that part as that design dates back to the 1950s or 60s and was superseded by the Johanson trimmer design in the late 1960s. You should be able to get a local machinist to make you a longer one using the one you have as an example. Burt VE2BMQ Thanks for the inputs - 73 - Jim - W5ZIT 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] Two CTCSS Tones out of One TX
Good idea, did not think about this option. This will serve our situation well. And will be an easy fix. Regards Kev. As has been pointed out, there are some problems with running two different PL tones at the same time, both on the TX and at the RX sites. It can be done, but it also can have some problems. Here is a thought, a possible solution to the problem. Run a single tone at the TX site, but selectable from 3 choices, say 100.0, 107.2, and 114.8. This can easily be done by diode switching on a Comm-Spec or similiar type encoder. At each RX site, have 2 decoders, one set to a common tone, maybe 100.0. When this PL is selected, both sites will be active. At site A, there will also be a parallel decoder on 107.2, and at site B there will be a parallel decoder on 114.8. So to run both sites, 100.0 is selected at the TX site. For site A only, run 107.2, and for site B only, run 114.8. This solution will cost a little more, but will be much easier to implement and keep running without problems, using any type of decoder. Joe __ 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] Duplexer Wanted
At 09:54 AM 04/22/06, you wrote: Hello Randy, With only 25 watts, the other option is to use two antennas with some separation. And it is also helpful to add a filter to the transmit line and another to the receiver. At least add one to the transmit side. Adding a filter to the transmit side would help eliminate the high power interference, and no loss for the receiver. And of course PL on your receiver would help too. NO IT WON'T. PL only hides a problem. It's like a lady down the block that had a squealing left front brake shoe (it was dragging) so she kept her window closed and turned up the volume on the CD player. If you want good performance, you need to leave it in carrier squelch mode and FIX IT. Mike WA6ILQ 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] Duplexer Wanted
Okay, you know it all! I only have been using this for a year and a half without any problems, and I know others who also use this. Of course you can run without the PL, just minimizes a chance of getting into the receiver. My transmitter and receiver use the same PL, so pretty much the same as carrier squelch. Maybe you need to turn off your CD player and open your mind! Mick - W7CAT Be sure to check out all the latest at http://www.wyocat.com/tarra Mike Morris wrote: At 09:54 AM 04/22/06, you wrote: Hello Randy, With only 25 watts, the other option is to use two antennas with some separation. And it is also helpful to add a filter to the transmit line and another to the receiver. At least add one to the transmit side. Adding a filter to the transmit side would help eliminate the high power interference, and no loss for the receiver. And of course PL on your receiver would help too. NO IT WON'T. PL only hides a problem. It's like a lady down the block that had a squealing left front brake shoe (it was dragging) so she kept her window closed and turned up the volume on the CD player. If you want good performance, you need to leave it in carrier squelch mode and FIX IT. Mike WA6ILQ 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/ __ NOD32 1.1502 (20060422) Information __ This message was checked by NOD32 antivirus system. http://www.eset.com 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.
