RE: [Repeater-Builder] 440 MHZ Duplexer Recommendation/Repeater at TV Station
The CAT 700B Controller works VERY WELL with an ICOM 706 Mrk II G as a remote base. Allows linking from our 220 repeater to 2, 440, 6mtrs, 10mtrs, or anything you want on HF. You can access the MEMORIES of the 706 which allows you to link to other programmed repeaters (* including their PL tones which is important ) if you like. Works very nicely that way. - Mike From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Mike Besemer (WM4B) Sent: Thursday, May 07, 2009 9:29 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] 440 MHZ Duplexer Recommendation/Repeater at TV Station Eric, As always, thanks for the advice. I'll add the bandpass cavity filter to the shopping list. We 'should' have good coverage, so we can probably forego any preamp until we can assess the footprint and add it later if necessary. Hopefully my cohort in crime got more word about the site today. I'm hoping we can tour the site soon with the site manager and/or engineer to see what we might have to work with and what they'll expect from us. I definitely believe in being a good tenant, especially when the benefactor is being so generous to us. I don't know what we'll use for repeater equipment yet, but suspect we'll end up with a MASTR II or MICOR conversion. I'm looking at different controllers to see what will do the job, not be a pain to program, and not cost us both arms and a leg. (We 'think' we might have some help from the EMA, but I don't want to be greedy either!) The two systems I have on the air now both have CAT-1000's and the other one that I help with has a CAT-500. I love the CAT-1000 (probably because I've got it figured out now) but they are a bit in the PRICEY side. I do believe, however, that it's worth spending the money to get something we can actually work with and that will lend itself to expansion (perhaps a link or remote-base) at a later time. Do you have a recommendation for a duplexer for this application (or any of the other equipment I need for that matter)? Everything I maintain now was either already in place or built from existing spare pieces-parts. I've never had the opportunity to select all the equipment for the site before and I don't want to mis-spend somebody else's money. 73, Mike WM4B From: Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> [mailto:Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> ] On Behalf Of Eric Lemmon Sent: Thursday, May 07, 2009 8:08 PM To: Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> Subject: RE: [Repeater-Builder] 440 MHZ Duplexer Recommendation/Repeater at TV Station Mike, Whenever I am putting a repeater- commercial or Amateur- at a broadcasting site, my preference is to always plan for a dual 8" bandpass cavity filter between the duplexer and the receiver input. My choice is usually a Telewave TWPC-4508-2, since it is very effective and is available with a Ham discount. I have two UHF repeaters at high-RF sites (one is close to a five megawatt FAA radar, and the other is close to a 25 kW coastal radar, while both are near UHF trunked radio systems.) but the bandpass filters are effective in eliminating receiver desense caused by "brute force" RF presence. If your site has good coverage, you may not need any amplification to make up for the slight insertion loss of the bandpass filter. I suggest that you use a good BpBr duplexer, rather than a simple notch duplexer, to gain additional bandpass filtering. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> [mailto:Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> ] On Behalf Of Mike (WM4B) Besemer Sent: Thursday, May 07, 2009 7:56 AM To: Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> Subject: [Repeater-Builder] 440 MHZ Duplexer Recommendation/Repeater at TV Station Greetings all, A friend of mine has been approached about accepting some tower/shack space at a local Public Broadcasting station. Between us, we've been working up our wants/needs for a 440 MHz system and I'm looking for suggestions for duplexers. The TV Station is on DT Channel 7 (175.25 video 179.75 sound) transmitting 31kW ERP. I've been fortunate so far in that both of my other sites are RF-free (we're the only tenant) so I've not had to deal with large amounts of RF floating about. What do I need to look out for? Thanks in advance, Mike WM4B __ NOD32 4051 (20090504) Information __ This message was checked by NOD32 antivirus system. http://www.eset.com
RE: [Repeater-Builder] 440 MHZ Duplexer Recommendation/Repeater at TV Station
Eric, As always, thanks for the advice. I'll add the bandpass cavity filter to the shopping list. We 'should' have good coverage, so we can probably forego any preamp until we can assess the footprint and add it later if necessary. Hopefully my cohort in crime got more word about the site today. I'm hoping we can tour the site soon with the site manager and/or engineer to see what we might have to work with and what they'll expect from us. I definitely believe in being a good tenant, especially when the benefactor is being so generous to us. I don't know what we'll use for repeater equipment yet, but suspect we'll end up with a MASTR II or MICOR conversion. I'm looking at different controllers to see what will do the job, not be a pain to program, and not cost us both arms and a leg. (We 'think' we might have some help from the EMA, but I don't want to be greedy either!) The two systems I have on the air now both have CAT-1000's and the other one that I help with has a CAT-500. I love the CAT-1000 (probably because I've got it figured out now) but they are a bit in the PRICEY side. I do believe, however, that it's worth spending the money to get something we can actually work with and that will lend itself to expansion (perhaps a link or remote-base) at a later time. Do you have a recommendation for a duplexer for this application (or any of the other equipment I need for that matter)? Everything I maintain now was either already in place or built from existing spare pieces-parts. I've never had the opportunity to select all the equipment for the site before and I don't want to mis-spend somebody else's money. 73, Mike WM4B From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Eric Lemmon Sent: Thursday, May 07, 2009 8:08 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] 440 MHZ Duplexer Recommendation/Repeater at TV Station Mike, Whenever I am putting a repeater- commercial or Amateur- at a broadcasting site, my preference is to always plan for a dual 8" bandpass cavity filter between the duplexer and the receiver input. My choice is usually a Telewave TWPC-4508-2, since it is very effective and is available with a Ham discount. I have two UHF repeaters at high-RF sites (one is close to a five megawatt FAA radar, and the other is close to a 25 kW coastal radar, while both are near UHF trunked radio systems.) but the bandpass filters are effective in eliminating receiver desense caused by "brute force" RF presence. If your site has good coverage, you may not need any amplification to make up for the slight insertion loss of the bandpass filter. I suggest that you use a good BpBr duplexer, rather than a simple notch duplexer, to gain additional bandpass filtering. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Mike (WM4B) Besemer Sent: Thursday, May 07, 2009 7:56 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] 440 MHZ Duplexer Recommendation/Repeater at TV Station Greetings all, A friend of mine has been approached about accepting some tower/shack space at a local Public Broadcasting station. Between us, we've been working up our wants/needs for a 440 MHz system and I'm looking for suggestions for duplexers. The TV Station is on DT Channel 7 (175.25 video 179.75 sound) transmitting 31kW ERP. I've been fortunate so far in that both of my other sites are RF-free (we're the only tenant) so I've not had to deal with large amounts of RF floating about. What do I need to look out for? Thanks in advance, Mike WM4B
RE: [Repeater-Builder] 440 MHZ Duplexer Recommendation/Repeater at TV Station
Mike, Whenever I am putting a repeater- commercial or Amateur- at a broadcasting site, my preference is to always plan for a dual 8" bandpass cavity filter between the duplexer and the receiver input. My choice is usually a Telewave TWPC-4508-2, since it is very effective and is available with a Ham discount. I have two UHF repeaters at high-RF sites (one is close to a five megawatt FAA radar, and the other is close to a 25 kW coastal radar, while both are near UHF trunked radio systems.) but the bandpass filters are effective in eliminating receiver desense caused by "brute force" RF presence. If your site has good coverage, you may not need any amplification to make up for the slight insertion loss of the bandpass filter. I suggest that you use a good BpBr duplexer, rather than a simple notch duplexer, to gain additional bandpass filtering. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Mike (WM4B) Besemer Sent: Thursday, May 07, 2009 7:56 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] 440 MHZ Duplexer Recommendation/Repeater at TV Station Greetings all, A friend of mine has been approached about accepting some tower/shack space at a local Public Broadcasting station. Between us, we've been working up our wants/needs for a 440 MHz system and I'm looking for suggestions for duplexers. The TV Station is on DT Channel 7 (175.25 video 179.75 sound) transmitting 31kW ERP. I've been fortunate so far in that both of my other sites are RF-free (we're the only tenant) so I've not had to deal with large amounts of RF floating about. What do I need to look out for? Thanks in advance, Mike WM4B
Re: [Repeater-Builder] 440 MHZ Duplexer Recommendation/Repeater at TV Station
I've not gotten it yet but the systems I ordered use a Cellwave duplexer. I'm not up on how they handle RF as my installation will be one stand alone and one moble. https://www.gmrsoutlet.com/product.php?productid=49&cat=19&page=1 73, Dean KJ4LII From: Mike (WM4B) Besemer To: Repeater-Builder@yahoogroups.com Sent: Thursday, May 7, 2009 10:55:46 AM Subject: [Repeater-Builder] 440 MHZ Duplexer Recommendation/Repeater at TV Station Greetings all, A friend of mine has been approached about accepting some tower/shack space at a local Public Broadcasting station. Between us, we've been working up our wants/needs for a 440 MHz system and I'm looking for suggestions for duplexers. The TV Station is on DT Channel 7 (175.25 video 179.75 sound) transmitting 31KW ERP. I've been fortunate so far in that both of my other sites are RF-free (we're the only tenant) so I've not had to deal with large amounts of RF floating about. What do I need to look out for? Thanks in advance, Mike WM4B
