[Repeater-Builder] 6 Meter Repeater
I am tossing around the idea of building a 6 meter repeater. This will have to be single site if I do this. What are you guys using for the repeater, duplexer, and antenna? Thanks, Charles KC5DGC
RE: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers)
Eric/Jeff/Chuck/... thanks for all of the good info. As the receiver site will be solar (& there's nothing electrical of any kind for quite a ways), I guess the site should be pretty quiet. Now start looking for some hardware. thanks again! Tim
RE: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers)
Jeff, I completely agree with your conclusions. The calculations of CommShop, while remarkably close to reality for 2m, 220, and 440 applications, are misleading at 6m and lower frequencies. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jeff DePolo Sent: Friday, January 22, 2010 11:59 AM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers) > I plugged the same values as before into CommShop, but this > time with a 1 > MHz split, and the result is about 85 dB isolation, which can > be met with > about 7.75 miles of horizontal separation. > The definitive method for testing whether your transmitter is causing > desense to your receiver is to radiate a weak signal to your > receive antenna > that results in a 12 dB SINAD reading on your service monitor > with your > transmitter off. Then, energize your transmitter. If the SINAD reading > drops, you have desense. As others have pointed out, the use > of one or more > bandpass cavities on either or both ends may greatly reduce > or eliminate > desense. You may be pleasantly surprised. > > 73, Eric Lemmon WB6FLY On 6m, it's pretty hard to find a site with a noise floor low enough that you will ever realize the "bench" sensitivity of the receiver. More often than not, the math says that you will have desense due to insufficient transmitter noise supression, but in the real world you never notice it because that Tx noise is hidden in the ambient noise floor. FWIW, I have a split-site 6m repeater (actually, it's off the air currently) on two high rise buildings in Philadelphia. Tx and Rx are Mastr II, TPO is 110 watts, antennas were originally HyGain V6R's but are being replaced by Kreco "co-plane". The two rooftops are equal height, and are about 150 yards apart. There is no additional filtering at either the Tx or Rx. No desense. However, the difference between the receiver's "bench" sensitivity and the effective sensitivity at the site is about 12 dB (i.e. 12 dB SINAD is about -106 dBm) when connected to an antenna. Quite often I see effective sensitivity on 6m as being up in the microvolt range, so you might want to plug in higher sensitivity values for the receiver spec (rather than 0.3 uV) when doing the math. FWIW, GE's duplex isolation curves show that you need 59 dB of Tx noise supression and 45 dB of carrier supression for a Mastr II lowband station at 50 watts and 0.2 uV, 1 MHz split. --- Jeff WN3A
RE: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers)
> I plugged the same values as before into CommShop, but this > time with a 1 > MHz split, and the result is about 85 dB isolation, which can > be met with > about 7.75 miles of horizontal separation. > The definitive method for testing whether your transmitter is causing > desense to your receiver is to radiate a weak signal to your > receive antenna > that results in a 12 dB SINAD reading on your service monitor > with your > transmitter off. Then, energize your transmitter. If the SINAD reading > drops, you have desense. As others have pointed out, the use > of one or more > bandpass cavities on either or both ends may greatly reduce > or eliminate > desense. You may be pleasantly surprised. > > 73, Eric Lemmon WB6FLY On 6m, it's pretty hard to find a site with a noise floor low enough that you will ever realize the "bench" sensitivity of the receiver. More often than not, the math says that you will have desense due to insufficient transmitter noise supression, but in the real world you never notice it because that Tx noise is hidden in the ambient noise floor. FWIW, I have a split-site 6m repeater (actually, it's off the air currently) on two high rise buildings in Philadelphia. Tx and Rx are Mastr II, TPO is 110 watts, antennas were originally HyGain V6R's but are being replaced by Kreco "co-plane". The two rooftops are equal height, and are about 150 yards apart. There is no additional filtering at either the Tx or Rx. No desense. However, the difference between the receiver's "bench" sensitivity and the effective sensitivity at the site is about 12 dB (i.e. 12 dB SINAD is about -106 dBm) when connected to an antenna. Quite often I see effective sensitivity on 6m as being up in the microvolt range, so you might want to plug in higher sensitivity values for the receiver spec (rather than 0.3 uV) when doing the math. FWIW, GE's duplex isolation curves show that you need 59 dB of Tx noise supression and 45 dB of carrier supression for a Mastr II lowband station at 50 watts and 0.2 uV, 1 MHz split. --- Jeff WN3A
RE: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers)
Tim, I plugged the same values as before into CommShop, but this time with a 1 MHz split, and the result is about 85 dB isolation, which can be met with about 7.75 miles of horizontal separation. The developer of CommShop was calculating distances that would result in NO desense, using radios available at that time. Many repeater owners simply put up with a small amount of desense, either because they have no means to measure it or they say that the repeater is working fine. I'll readily admit that many repeaters will "work fine" with some desense, and their owners get on with their lives. I daresay that a split-site 6m repeater using Micor or Mastr II radios will supremely outperform a similar system using Alinco or similar mobile radios that have broadband front ends. Doug Bade made a very good point that some desense may result from other stations that may be closer to your receive site than your transmitter; in this case, horizontal separation between your sites is meaningless. Obviously, a neighboring transmitter that is only 500 kHz away from your receive frequency will completely swamp your transmitter that is 1 MHz away. The definitive method for testing whether your transmitter is causing desense to your receiver is to radiate a weak signal to your receive antenna that results in a 12 dB SINAD reading on your service monitor with your transmitter off. Then, energize your transmitter. If the SINAD reading drops, you have desense. As others have pointed out, the use of one or more bandpass cavities on either or both ends may greatly reduce or eliminate desense. You may be pleasantly surprised. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Tim Ahrens Sent: Friday, January 22, 2010 6:57 AM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers) Thanks to all for the great response! Well, since we are 1meg splits here -thanks Don-, that should help some also. (I had looked up a couple of repeaters around here & saw .5 split, so thought that's how it was). Anyhow, it's just in the thinking stages. Thanks again, Tim W5FN
RE: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers)
Thanks to all for the great response! Well, since we are 1meg splits here -thanks Don-, that should help some also. (I had looked up a couple of repeaters around here & saw .5 split, so thought that's how it was). Anyhow, it's just in the thinking stages. Thanks again, Tim W5FN
Re: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers)
Exactly my feeling. We've got low-band fire here with channels close-spaced and
high power TX and desense on an adjacent channel is rarely an issue. Usually
you've got to be within one or two blocks from the 1/4K before it gets noticed.
Chuck
- Original Message -
From: Doug Bade
To: Repeater-Builder@yahoogroups.com
Sent: Friday, January 22, 2010 9:24 AM
Subject: Re: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers)
I had a quite much longer reply in the buffer and decided to shorten
it.. .. but 19 miles for any tx to rx coupling would seem to make the band
unusable in a metro area.. due to every radio would swamp every receiver in the
market...This is just not the case..
The only influence the tx could have on the rx (500khz spacing) at over maybe
a mile or two would be white noise.. as the carrier would be well below desense
levels itself at that range The implication is every white noise generator
within 19 miles would disrupt the rx site aka every mobile in the band.
or base or other repeater..
I can say I am aware of a system that a group here operated a 6m repeater
site to site at .5 miles at 300khz with modest filters on the TX end.. The RX
site actually had 3 repeater receivers for 3 different clubs...
Proper engineering would put at least a single bandpass can and maybe an
isolator if possible on the TX site.. to minimize white noise to other
users...and by itself should make the system useable within a mile let alone
8...or 19...
Doug
KD8B
At 08:59 AM 1/22/2010, you wrote:
Boy, that seems excessive to me, even at 500 kHz. My hunch is that you'll
have acceptable performance much closer in distance. 1 MHz spacing was
mentioned which would obviously be even better.
Chuck
WB2EDV
- Original Message -
From: "Eric Lemmon"
To: < Repeater-Builder@yahoogroups.com>
Sent: Friday, January 22, 2010 12:19 AM
Subject: RE: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers)
> Tim,
>
> I use CommShop for Windows, a handy package that does much more than
> duplexer isolation calculations. Go here for more info:
> < www.dcico.com/dcilmr.htm>
>
> It calculates that you'll need about 93 dB of isolation, which requires
> more
> than 19 miles of horizontal separation. This can be reduced by using
> lower
> power output, a better receiver and PA, and perhaps directional antennas.
> Bear in mind that CommShop and similar programs make many assumptions to
> come up with these estimates, and some or all of those assumption might be
> invalid. YMMV...
>
> 73, Eric Lemmon WB6FLY
>
>
>
> -Original Message-
> From: Repeater-Builder@yahoogroups.com
> [ mailto:repeater-buil...@yahoogroups.com] On Behalf Of Tim Ahrens
> Sent: Thursday, January 21, 2010 7:21 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: RE: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers)
>
>
>
> Hi Eric/all,
>
> Since this is just a curiosity at this time, let's figure 50 watts,
> 0.25uV, & 500khz split.
>
> I figured that was the case about the vertical separation, but
> threw it in anyway.
>
> One site would be a solar site, so it would make sense to
> make it the RX. Guess it might require a notch can at
> the rx site, based on what Chris said.
>
> BTW, what software package are you using?
>
> I've been using Radio Mobile for coverage, & it works
> pretty good.
>
> Thanks,
>
> Tim W5FN
>
--
No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 9.0.730 / Virus Database: 271.1.1/2638 - Release Date: 01/22/10
02:34:00
Re: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers)
I had a quite much longer reply in the buffer and decided to shorten it.. .. but 19 miles for any tx to rx coupling would seem to make the band unusable in a metro area.. due to every radio would swamp every receiver in the market...This is just not the case.. The only influence the tx could have on the rx (500khz spacing) at over maybe a mile or two would be white noise.. as the carrier would be well below desense levels itself at that range The implication is every white noise generator within 19 miles would disrupt the rx site aka every mobile in the band. or base or other repeater.. I can say I am aware of a system that a group here operated a 6m repeater site to site at .5 miles at 300khz with modest filters on the TX end.. The RX site actually had 3 repeater receivers for 3 different clubs... Proper engineering would put at least a single bandpass can and maybe an isolator if possible on the TX site.. to minimize white noise to other users...and by itself should make the system useable within a mile let alone 8...or 19... Doug KD8B At 08:59 AM 1/22/2010, you wrote: Boy, that seems excessive to me, even at 500 kHz. My hunch is that you'll have acceptable performance much closer in distance. 1 MHz spacing was mentioned which would obviously be even better. Chuck WB2EDV - Original Message - From: "Eric Lemmon" <<mailto:wb6fly%40verizon.net>wb6...@verizon.net> To: <<mailto:Repeater-Builder%40yahoogroups.com>Repeater-Builder@yahoogroups.com> Sent: Friday, January 22, 2010 12:19 AM Subject: RE: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers) > Tim, > > I use CommShop for Windows, a handy package that does much more than > duplexer isolation calculations. Go here for more info: > > > It calculates that you'll need about 93 dB of isolation, which requires > more > than 19 miles of horizontal separation. This can be reduced by using > lower > power output, a better receiver and PA, and perhaps directional antennas. > Bear in mind that CommShop and similar programs make many assumptions to > come up with these estimates, and some or all of those assumption might be > invalid. YMMV... > > 73, Eric Lemmon WB6FLY > > > > -Original Message- > From: <mailto:Repeater-Builder%40yahoogroups.com>Repeater-Builder@yahoogroups.com > [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Tim Ahrens > Sent: Thursday, January 21, 2010 7:21 PM > To: <mailto:Repeater-Builder%40yahoogroups.com>Repeater-Builder@yahoogroups.com > Subject: RE: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers) > > > > Hi Eric/all, > > Since this is just a curiosity at this time, let's figure 50 watts, > 0.25uV, & 500khz split. > > I figured that was the case about the vertical separation, but > threw it in anyway. > > One site would be a solar site, so it would make sense to > make it the RX. Guess it might require a notch can at > the rx site, based on what Chris said. > > BTW, what software package are you using? > > I've been using Radio Mobile for coverage, & it works > pretty good. > > Thanks, > > Tim W5FN >
Re: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers)
Boy, that seems excessive to me, even at 500 kHz. My hunch is that you'll have acceptable performance much closer in distance. 1 MHz spacing was mentioned which would obviously be even better. Chuck WB2EDV - Original Message - From: "Eric Lemmon" To: Sent: Friday, January 22, 2010 12:19 AM Subject: RE: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers) > Tim, > > I use CommShop for Windows, a handy package that does much more than > duplexer isolation calculations. Go here for more info: > > > It calculates that you'll need about 93 dB of isolation, which requires > more > than 19 miles of horizontal separation. This can be reduced by using > lower > power output, a better receiver and PA, and perhaps directional antennas. > Bear in mind that CommShop and similar programs make many assumptions to > come up with these estimates, and some or all of those assumption might be > invalid. YMMV... > > 73, Eric Lemmon WB6FLY > > > > -Original Message- > From: Repeater-Builder@yahoogroups.com > [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Tim Ahrens > Sent: Thursday, January 21, 2010 7:21 PM > To: Repeater-Builder@yahoogroups.com > Subject: RE: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers) > > > > Hi Eric/all, > > Since this is just a curiosity at this time, let's figure 50 watts, > 0.25uV, & 500khz split. > > I figured that was the case about the vertical separation, but > threw it in anyway. > > One site would be a solar site, so it would make sense to > make it the RX. Guess it might require a notch can at > the rx site, based on what Chris said. > > BTW, what software package are you using? > > I've been using Radio Mobile for coverage, & it works > pretty good. > > Thanks, > > Tim W5FN >
RE: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers)
To everybody that did the math for Tim, we are 1 meg split here in the country of Texas. Tim, I have some 1 5/8 hard line if you want to make a set of notch duplexers, probably can get you the 80% done set from a buddy. Don Kirchner W5DK -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of tahrens301 Sent: Thursday, January 21, 2010 4:09 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers) Hi Folks, I was just wondering if one of you who has the software to do so could look up how much horizontal separation it would take on 6 meters. I have two sites 8 miles apart, and vertically separated by about 30 meters. just wonderin' Thanks, Tim W5FN Yahoo! Groups Links
RE: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers)
Tim, I use CommShop for Windows, a handy package that does much more than duplexer isolation calculations. Go here for more info: It calculates that you'll need about 93 dB of isolation, which requires more than 19 miles of horizontal separation. This can be reduced by using lower power output, a better receiver and PA, and perhaps directional antennas. Bear in mind that CommShop and similar programs make many assumptions to come up with these estimates, and some or all of those assumption might be invalid. YMMV... 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Tim Ahrens Sent: Thursday, January 21, 2010 7:21 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers) Hi Eric/all, Since this is just a curiosity at this time, let's figure 50 watts, 0.25uV, & 500khz split. I figured that was the case about the vertical separation, but threw it in anyway. One site would be a solar site, so it would make sense to make it the RX. Guess it might require a notch can at the rx site, based on what Chris said. BTW, what software package are you using? I've been using Radio Mobile for coverage, & it works pretty good. Thanks, Tim W5FN
Re: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers)
Ball park - 50.000 RX 50.500 TX 50 w .25 uV Commshop comes up with 92.6 dB of isolation required at a distance 101,843 feet horizontally (about 19 1/4 miles). On Thu, Jan 21, 2010 at 8:20 PM, Tim Ahrens wrote: > > > Hi Eric/all, > > Since this is just a curiosity at this time, let's figure 50 watts, > 0.25uV, & 500khz split. > > I figured that was the case about the vertical separation, but > threw it in anyway. > > One site would be a solar site, so it would make sense to > make it the RX. Guess it might require a notch can at > the rx site, based on what Chris said. > > BTW, what software package are you using? > > I've been using Radio Mobile for coverage, & it works > pretty good. > > Thanks, > > Tim W5FN > > >
RE: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers)
Hi Eric/all, Since this is just a curiosity at this time, let's figure 50 watts, 0.25uV, & 500khz split. I figured that was the case about the vertical separation, but threw it in anyway. One site would be a solar site, so it would make sense to make it the RX. Guess it might require a notch can at the rx site, based on what Chris said. BTW, what software package are you using? I've been using Radio Mobile for coverage, & it works pretty good. Thanks, Tim W5FN
RE: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers)
Tim, We need to know how much power the TX has, and what sensitivity the RX has, before your question can be answered. Are the TX and RX frequencies 500 kHz apart? Vertical separation only counts when the two antennas are one directly above and in line with the other. At 8 miles separation, it wouldn't make a bit of difference even if one antenna was 1000 feet up. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of tahrens301 Sent: Thursday, January 21, 2010 2:09 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers) Hi Folks, I was just wondering if one of you who has the software to do so could look up how much horizontal separation it would take on 6 meters. I have two sites 8 miles apart, and vertically separated by about 30 meters. just wonderin' Thanks, Tim W5FN
RE: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers)
Assuming .5 spacing, 7.99 miles for a .35 rx and 15 watts out tx Kb0wlf > -Original Message- > From: Repeater-Builder@yahoogroups.com [mailto:Repeater- > buil...@yahoogroups.com] On Behalf Of tahrens301 > Sent: Thursday, January 21, 2010 4:09 PM > To: Repeater-Builder@yahoogroups.com > Subject: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers) > > Hi Folks, > > I was just wondering if one of you who has the software to > do so could look up how much horizontal separation it would > take on 6 meters. I have two sites 8 miles apart, and vertically > separated by about 30 meters. > > just wonderin' > > Thanks, > > Tim W5FN > > > > > > > > Yahoo! Groups Links > > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.432 / Virus Database: 270.14.143/2624 - Release Date: > 01/21/10 07:34:00
[Repeater-Builder] 6 Meter Repeater spacing (no duplexers)
Hi Folks, I was just wondering if one of you who has the software to do so could look up how much horizontal separation it would take on 6 meters. I have two sites 8 miles apart, and vertically separated by about 30 meters. just wonderin' Thanks, Tim W5FN
[Repeater-Builder] 6 Meter Repeater Desense issues.
First of all let me thank everyone that answered my questions about LMR-400 cable and the desense issues I have been having. So far tests right up to the antenna with a dummy load have shown no desense so to me that leaves the antenna. After some discussion with a Diamond representative who didn't have a lot of technical background this is what I have learned. The model DP-GH62 appears to cover the 6 meter band in two segments. 50 to 51.5 and 52 to 54 Mhz. There is a 9.5 pf cap across a coil at the base and with the cap in place it is supposed to operate from 50.to 51.5 and removing the cap moves it up to 52 to 54. My repeater frequencies are 52.810 out and 51.110 in. So I need to either move my input frequency up or so If I play with the value of the cap say 12 to 25 pf and make the antenna resonate somewhere from 51 to 53 Mhz? Thank You Tom Elmore KA1NVZ Anchorage, Alaska
RE: [Repeater-Builder] 6 meter Repeater
Eric, Your question cannot be answered properly unless you provide the power output of your transmitter and the 12 dB SINAD sensitivity of your receiver. Therefore, I will offer some calculations based on some assumed values: 25 watt transmitter, 0.35 uV receiver, 1.7 MHz split: 237 feet vertical separation, 13,368 feet horizontal. 50 watt transmitter, 0.35 uV receiver, 1.7 MHz split: 282 feet vertical separation, 18,905 feet horizontal. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Eric Harrison Sent: Wednesday, September 03, 2008 7:18 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] 6 meter Repeater Well regardless if whether 1.7MHz split in the 6 meter band is or is not a national US band plan split, it is an accepted split by the Kansas State Repeater Cordinator as my repeater is cordinated on 52.850/51.150 by them and has been for over 2 years. Just getting it back on the air at a new site. Wasn't trying a war here just trying to get some answers on the dB isolation needed and acceptable vertical antenna separation needed for a 1.7MHz split on 6 meters, which is my reason for posting but have failed to see anyone give the answers I needed. Eric N7JYS
Re: [Repeater-Builder] 6 meter Repeater
On Sep 3, 2008, at 8:18 PM, Eric Harrison wrote: > Well regardless if wether 1.7mhz split in the 6 meter band is or is > not > a national US band plan split it is an excepted split by the Kansas > State Repeater Cordinator as my repeater is cordinated on > 52.850/51.150 > by them and has been for over 2 years. Just getting it back on the air > at a new site. Wasn't trying a war here just trying to get some > answers > on the db isolation needed and exceptibale vertical antenna seperation > needed for a 1.7mhz split on 6 meters, which is my reason for posting > but have failed to see anyone give the answers I needed. > > > Eric > N7JYS No war, Eric... just discussing. Someone mentioned they needed to know what your expected transmitter power was to help with the isolation numbers. Did you post that? -- Nate Duehr, WY0X [EMAIL PROTECTED]
[Repeater-Builder] 6 meter Repeater
Well regardless if wether 1.7mhz split in the 6 meter band is or is not a national US band plan split it is an excepted split by the Kansas State Repeater Cordinator as my repeater is cordinated on 52.850/51.150 by them and has been for over 2 years. Just getting it back on the air at a new site. Wasn't trying a war here just trying to get some answers on the db isolation needed and exceptibale vertical antenna seperation needed for a 1.7mhz split on 6 meters, which is my reason for posting but have failed to see anyone give the answers I needed. Eric N7JYS
[Repeater-Builder] 6 meter repeater
Looking for db of isolation need for a 1.7mhz split repeater on the 6 meter band. If using split antennas what would be the vertical seperation needed? Thanks. Eric N7JYS
RE: [Repeater-Builder] 6 meter repeater Identification and help
Travis, The Motorola Reference Manual describes the B61LPY-3100DT as a Repeater (RT) Station for the 25-50 MHz band. It is rated as 100 watts continuous duty, with Private-Line squelch and DC remote control. The service manual for the station is 6881003E65 which, unfortunately, is long out of print and not available from Motorola Parts. You may be able to locate that manual on an auction site. Armed with the service manual, you should be able to convert that station's receiver to the 6m band by changing out some capacitors in the front end and local oscillator stages. The transmitter section will take a lot more work, but it can be done with the appropriate tools and test equipment. You might consider contacting a firm that specializes in such conversions for suggestions and cost. Repeater-Builder (the Company) is one such firm. The Sinclair R-103G duplexer is a very good unit, but it will take some serious sheet-metal work to make it perform well in the 6m band. The conversion involves shortening both the outer cylinder and the internal elements, and changing the cable harness. You might consider contacting Sinclair tech support for suggestions, at www.sinctech.com Although they are somewhere around 30 years old, such Motorola stations seem to keep running... 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of travis8303 Sent: Sunday, December 09, 2007 8:23 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] 6 meter repeater Identification and help Hello group, I have four Motorola repeaters in the 48-49 MHZ range. The fifth is high VHF. 1) Can anyone tell me what they are? 2) Any leads for information or people that might know how to convert the equipment for ham use? The repeater model is B61LPY 3100DT SPL (it looks like) The duplexers are model R-103G Pictures are posted on my site: hteeteep://aa9nv.r2i.net/Repeaters6M.htm take out the extra ee's :) Any help would be greatly appreciated. Thank you, Travis AA9NV
Re: [Repeater-Builder] 6 meter repeater Identification and help
The repeater is a 120 watt continous duty Motrac with factory PL and no extender, I think. The duplexer is a exactly what the label says. I have had one operating on 6 meters for about 15 years. They need slight modification to go to 6 meters. -- Original Message -- Received: Mon, 10 Dec 2007 02:01:28 PM CST From: "travis8303" <[EMAIL PROTECTED]> To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] 6 meter repeater Identification and help > Hello group, > > I have four Motorola repeaters in the 48-49 MHZ range. > The fifth is high VHF. > > 1) Can anyone tell me what they are? > 2) Any leads for information or people that might know how to convert > the equipment for ham use? > > The repeater model is B61LPY 3100DT SPL (it looks like) > The duplexers are model R-103G > > Pictures are posted on my site: > hteeteep://aa9nv.r2i.net/Repeaters6M.htm > take out the extra ee's :) > > Any help would be greatly appreciated. > > Thank you, > Travis > AA9NV > >
[Repeater-Builder] 6 meter repeater Identification and help
Hello group, I have four Motorola repeaters in the 48-49 MHZ range. The fifth is high VHF. 1) Can anyone tell me what they are? 2) Any leads for information or people that might know how to convert the equipment for ham use? The repeater model is B61LPY 3100DT SPL (it looks like) The duplexers are model R-103G Pictures are posted on my site: hteeteep://aa9nv.r2i.net/Repeaters6M.htm take out the extra ee's :) Any help would be greatly appreciated. Thank you, Travis AA9NV
Re: [Repeater-Builder] 6 meter repeater with 2 meter link?
rthollenbeck wrote: > I have a good site avaialible to me (2 good sites) for a repeater. So > I was thinking about putting in a repeater on 6 meters Is there any > good reason why I should not link a the sites on a 2 meter fequency. > I have Mastr II for 6 meters and I have access to a low power Mastr II > for the link that will tune to 2 meters. I don't have a UHF mastrII ummm-because it's illegal. links have to be above 222 Mhz. now if 2M was a standalone repeater, with a 6M rx tied to it, and at the other end a 2M rx listening to the 2M output tied to the 6M tx with no hang time, that would be different. -- Jim Barbour WD8CHL 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] 6 meter repeater with 2 meter link?
This means no linking USING a six meter frequency...not that 6m machines can't be linked. At 07:52 PM 1/29/2006, you wrote: >I sure thought I remembered a few years ago that the FCC started to allow >linking on 6 meters, in order to get more activity there. > >-- Original Message -- >Received: Sun, 29 Jan 2006 06:45:59 PM CST >From: mch <[EMAIL PROTECTED]> >To: Repeater-Builder@yahoogroups.com >Subject: Re: [Repeater-Builder] 6 meter repeater with 2 meter link? > > > No - above 222.150 MHz, and not on 6M at all. > > > > Joe M. > > > > JOHN MACKEY wrote: > > > > > > Linking is not legal on 2 meters. All links must be on 6 meters or above >222 > > > MHz. > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > >Yahoo! Groups Links > > > > Thanks, Robin Midgett K4IDC VHF+ Glutton EM66se 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] 6 meter repeater with 2 meter link?
I sure thought I remembered a few years ago that the FCC started to allow linking on 6 meters, in order to get more activity there. -- Original Message -- Received: Sun, 29 Jan 2006 06:45:59 PM CST From: mch <[EMAIL PROTECTED]> To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] 6 meter repeater with 2 meter link? > No - above 222.150 MHz, and not on 6M at all. > > Joe M. > > JOHN MACKEY wrote: > > > > Linking is not legal on 2 meters. All links must be on 6 meters or above 222 > > MHz. > > > > > > > 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] 6 meter repeater with 2 meter link?
No - above 222.150 MHz, and not on 6M at all. Joe M. JOHN MACKEY wrote: > > Linking is not legal on 2 meters. All links must be on 6 meters or above 222 > MHz. 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] 6 meter repeater with 2 meter link?
Linking is not legal on 2 meters. All links must be on 6 meters or above 222 MHz. Alternately, you could wireline your link, but the is usually not cost effective in the amateur service. -- Original Message -- Received: Sat, 28 Jan 2006 08:40:16 AM CST From: "rthollenbeck" <[EMAIL PROTECTED]> To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] 6 meter repeater with 2 meter link? > I have a good site avaialible to me (2 good sites) for a repeater. So > I was thinking about putting in a repeater on 6 meters Is there any > good reason why I should not link a the sites on a 2 meter fequency. > I have Mastr II for 6 meters and I have access to a low power Mastr II > for the link that will tune to 2 meters. I don't have a UHF mastrII > > > > > > > > > > > > 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] 6 meter repeater with 2 meter link?
Not true. Linking has been allowed on 6 meters for a few years now. "ALL" links & control are requered to be on 222 MHZ & above as wireline linking control has always been legal. -- Original Message -- Received: Sat, 28 Jan 2006 09:04:48 AM CST From: "Chuck Kraly" <[EMAIL PROTECTED]> To: Subject: RE: [Repeater-Builder] 6 meter repeater with 2 meter link? > Well for one, According to the FCC rules, ALL links and control must be done > above 222Mhz > > > -Original Message- > From: Repeater-Builder@yahoogroups.com > [mailto:[EMAIL PROTECTED] On Behalf Of rthollenbeck > Sent: Saturday, January 28, 2006 8:27 AM > To: Repeater-Builder@yahoogroups.com > Subject: [Repeater-Builder] 6 meter repeater with 2 meter link? > > I have a good site avaialible to me (2 good sites) for a repeater. So > I was thinking about putting in a repeater on 6 meters Is there any > good reason why I should not link a the sites on a 2 meter fequency. > I have Mastr II for 6 meters and I have access to a low power Mastr II > for the link that will tune to 2 meters. I don't have a UHF mastrII > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.1.375 / Virus Database: 267.14.23/243 - Release Date: 1/27/2006 > > > -- > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.1.375 / Virus Database: 267.14.23/243 - Release Date: 1/27/2006 > > > > > > > > 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] 6 meter repeater with 2 meter link?
I don't know where you're located, but out here in CA, link radios have to be at or above the 222 MHz band. Double ditto if you're sending control sigs over the link. In most areas, 2 m is too crowded to allow use of that band for linking. You might talk with your local coordination group about it. 73, Dick - Original Message - From: "rthollenbeck" <[EMAIL PROTECTED]> To: Sent: 28 January, 2006 06:26 Subject: [Repeater-Builder] 6 meter repeater with 2 meter link? I have a good site avaialible to me (2 good sites) for a repeater. So I was thinking about putting in a repeater on 6 meters Is there any good reason why I should not link a the sites on a 2 meter fequency. I have Mastr II for 6 meters and I have access to a low power Mastr II for the link that will tune to 2 meters. I don't have a UHF mastrII 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] 6 meter repeater with 2 meter link?
At 09:19 AM 1/28/2006 -0600, you wrote: This begs the question, can a tcpip connection be used as >wireline control? <-- Why not? But if it's done over the air, then the same 222.5 Mhz and above rule applies. I have an 802.11 (operating in the ham band of course!) feed to one of my sites and use a diskless Linux mini-ITX board for (among other things) positive control of the system. Ken -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net 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] 6 meter repeater with 2 meter link?
I suppose you could use 2M to get to another repeater (if you can find a 2M frequency), BUT as otherwise mentioned, control links 220 and above, or wireline...This begs the question, can a tcpip connection be used as wireline control? Steve NU5D -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Kevin Custer Sent: Saturday, January 28, 2006 8:59 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] 6 meter repeater with 2 meter link? The FCC rules say you must link on a frequency of 222.15 MHz or above. That's one GOOD reason not to. rthollenbeck wrote: >I have a good site avaialible to me (2 good sites) for a repeater. So -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 267.14.23/243 - Release Date: 1/27/2006 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] 6 meter repeater with 2 meter link?
Well for one, According to the FCC rules, ALL links and control must be done above 222Mhz -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of rthollenbeck Sent: Saturday, January 28, 2006 8:27 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] 6 meter repeater with 2 meter link? I have a good site avaialible to me (2 good sites) for a repeater. So I was thinking about putting in a repeater on 6 meters Is there any good reason why I should not link a the sites on a 2 meter fequency. I have Mastr II for 6 meters and I have access to a low power Mastr II for the link that will tune to 2 meters. I don't have a UHF mastrII Yahoo! Groups Links -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 267.14.23/243 - Release Date: 1/27/2006 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 267.14.23/243 - Release Date: 1/27/2006 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] 6 meter repeater with 2 meter link?
The FCC rules say you must link on a frequency of 222.15 MHz or above. That's one GOOD reason not to. rthollenbeck wrote: >I have a good site avaialible to me (2 good sites) for a repeater. So >I was thinking about putting in a repeater on 6 meters Is there any >good reason why I should not link a the sites on a 2 meter fequency. >I have Mastr II for 6 meters and I have access to a low power Mastr II >for the link that will tune to 2 meters. I don't have a UHF mastrII > 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] 6 meter repeater with 2 meter link?
I have a good site avaialible to me (2 good sites) for a repeater. So I was thinking about putting in a repeater on 6 meters Is there any good reason why I should not link a the sites on a 2 meter fequency. I have Mastr II for 6 meters and I have access to a low power Mastr II for the link that will tune to 2 meters. I don't have a UHF mastrII 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] 6 meter repeater interference
Joe, Because the separation (about 45 MHz) is significant, you might consider installing a cavity filter on your receiver input. A less expensive solution might be to order up a helical resonator filter from DCI. Don't forget that the FM station operator has an obligation to not interfere with other licensed stations, so he/she must step up to the plate and be a part of the solution. Write a letter to the station manager explaining the interference problem, and ask for his/her assistance in reaching a solution. Don't wait to do this! 73, Eric Lemmon WB6FLY Joe wrote: > I just got a new neighbor at my 6 meter repeater site, a low power (30 > watt) FM broadcast station on 94.9 MHz. I now have low level > interference on my MastrII repeater input frequency. > > As a simple troubleshooting tool, I thought about putting a low pass > filter on the receiver or the antenna connection to the duplexer. This > would attenuate any 94.9 MHz signal coming down the coax. My thoughts > are to take the low pass filter out of a MastrII PA, but I don't know > what the input impedance to it is. Does anyone know if the final PA of > a MasterII is 50 ohms into the low pass filter? I believe that it is, > but not sure. 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] 6 meter repeater interference
You might have better luck with shorted coax stubs on the target frequency with tees to the feeder line and at both ends of the coax. On 7/6/05, Joe <[EMAIL PROTECTED]> wrote: > Hello to All, > > I just got a new neighbor at my 6 meter repeater site, a low power (30 > watt) FM broadcast station on 94.9MHZ. I now have low level > interference on my MastrII repeater input frequency. > > As a simple troubleshooting tool, I thought about putting a low pass > filter on the receiver or the antenna connection to the duplexer. This > would attenuate any 94.9Mhz signal coming down the coax. My thoughts > are to take the low pass filter out of a MastrII PA, but I don't know > what the input impeadance to it is. Does anyone know if the final PA > of a MasterII is 50 ohms into the low pass filter? I belive that it > is, but not sure. > > 73, Joe, k1ike > > > > > > > > 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] 6 meter repeater interference
Hello to All, I just got a new neighbor at my 6 meter repeater site, a low power (30 watt) FM broadcast station on 94.9MHZ. I now have low level interference on my MastrII repeater input frequency. As a simple troubleshooting tool, I thought about putting a low pass filter on the receiver or the antenna connection to the duplexer. This would attenuate any 94.9Mhz signal coming down the coax. My thoughts are to take the low pass filter out of a MastrII PA, but I don't know what the input impeadance to it is. Does anyone know if the final PA of a MasterII is 50 ohms into the low pass filter? I belive that it is, but not sure. 73, Joe, k1ike 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/
