RE: [Repeater-Builder] Re: Diamond X-50 NA
Bob - Tell us more about how you did that what filtering/protection you used? (I've been thinking of a very similar project) -- Original Message -- Received: Fri, 29 Aug 2008 09:33:50 PM PDT From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Diamond X-50 NA Not too long ago I installed a TRAM 1480 with the following connected to it: 2M TX, 2M RX (repeater) 445 TX, 440 RX (repeater) 420 TX, 430 RX (duplex link) All running at the same time. No desense.
RE: [Repeater-Builder] Re: Diamond X-50 NA
At 8/30/2008 08:19, you wrote: Bob - Tell us more about how you did that what filtering/protection you used? (I've been thinking of a very similar project) Any ol' crossband diplexer to split between the 2 meter 440 bands (well, not quite any: must have connectors on the unit - no pigtail leads, which will cause desense). In this example I used an Austin diplexer, though I found the loss to be higher than the Comet/Diamond equivalents. The antenna port of the 2 meter duplexer of course went to the VHF side of the diplexer. On the UHF side, I used a wide split mobile duplexer to multiplex in the 420 TX. That duplexer was tuned to notch 440 445 on the low freq. port notch 420 on the high freq. port. The high freq. port of that duplexer went to the antenna port of another notch duplexer that duplexed the 445 TX 440 RX. A splitter or 10 dB coupler went on the RX port of that duplexer for the 439 MHz link RX. There were also pass cavities on both UHF TXs on the low freq. (RX) port of the 440 duplexer. The 439 link RX 440 main RX freqs. were close enough that I could tolerate the small additional losses on the 439 channel that were due to the pass cavity being tuned to 440. Bob NO6B
[Repeater-Builder] Re: Diamond X-50 NA
I use the X50A (same thing just N type connector) on the W3AHS-R repeater here in Williamsport, PA. I have used it since 2001 with no problems, in fact I have 2 of them up there and the 440 Link radio also shares it and have not had any problems. It is mounted on the roof of the high school which sit on top of a hill about 1000 ft. elev. I know another guy who has used it for an APRS digi up on the 2,000 ft Williamsport Bald Eagle mountain even before that and it is still holding. As far as the gain. Yeah its a little low but for UHF its a little higher. I have talked mobile to Laporte, base stations in Hazleton, mobile to Mill Hall and even on Route 80 at the Clinton/Centre County line and about 20 miles to the south (good ol 2000 ft mountain in the way). I guess you can see what I think of it. 73 John KB3AWQ Anyone have any opinions on the Diamond X-50NA? I have an application to use it for a simple repeater on UHF.
Re: [Repeater-Builder] Re: Diamond X-50 NA
Thanks for the input, Joe! -- Original Message -- Received: Thu, 28 Aug 2008 08:56:46 PM PDT From: Joe Burkleo [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Diamond X-50 NA John, I have several of these up for repeaters here on the Oregon Coast. They hold up pretty well. I would recommend a top brace if they are in a harsh environment. I like their performance on UHF, they work very well for their size and price. On VHF they of course are a little lacking, and I have found they compare to the performance of one of the single Telewave broadband loops. We have one on a 4000' mountaintop that sees a fair amount of snow and ice and it has survived 2 winters up there so far. Hope this helps, Joe - WA7JAW --- In Repeater-Builder@yahoogroups.com, John Mackey [EMAIL PROTECTED] wrote: Anyone have any opinions on the Diamond X-50NA? I have an application to use it for a simple repeater on UHF.
RE: [Repeater-Builder] Re: Diamond X-50 NA
A number of years ago, the packet operations here were able to get three systems placed on cell sites. Each system consisted of a 440 MHz full-duplex bit-regenerative 9600 bps packet repeater, and a 146 MHz 1200 baud simplex digipeater/gateway. All three systems were using X50A antennas, professionally installed, on the cell towers. We noticed that when the 146 MHz transmitter was active the 440 MHz repeater experienced desense that it didn't when the 146 MHz transmitter wasn't active. When the same test was performed using a dummy load, we didn't have the problem. I attributed this to IM generation in the antenna, although in further consideration, there are some other possibilities - IMG on the tower and/or in the lighting protector. All three systems experienced this, although to varying degrees. Not a scientific result, but might be a reason to not use a dual-band antenna on both bands. 73 Bob, KD7NM PS: My first post to the group - joined yesterday -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of John W. Springman III - KB3AWQ Sent: Friday, August 29, 2008 9:12 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Diamond X-50 NA I use the X50A (same thing just N type connector) on the W3AHS-R repeater here in Williamsport, PA. I have used it since 2001 with no problems, in fact I have 2 of them up there and the 440 Link radio also shares it and have not had any problems. It is mounted on the roof of the high school which sit on top of a hill about 1000 ft. elev. I know another guy who has used it for an APRS digi up on the 2,000 ft Williamsport Bald Eagle mountain even before that and it is still holding. As far as the gain. Yeah its a little low but for UHF its a little higher. I have talked mobile to Laporte, base stations in Hazleton, mobile to Mill Hall and even on Route 80 at the Clinton/Centre County line and about 20 miles to the south (good ol 2000 ft mountain in the way). I guess you can see what I think of it. 73 John KB3AWQ Anyone have any opinions on the Diamond X-50NA? I have an application to use it for a simple repeater on UHF. Yahoo! Groups Links
RE: [Repeater-Builder] Re: Diamond X-50 NA
At 8/29/2008 09:41, you wrote: A number of years ago, the packet operations here were able to get three systems placed on cell sites. Each system consisted of a 440 MHz full-duplex bit-regenerative 9600 bps packet repeater, and a 146 MHz 1200 baud simplex digipeater/gateway. All three systems were using X50A antennas, professionally installed, on the cell towers. We noticed that when the 146 MHz transmitter was active the 440 MHz repeater experienced desense that it didn't when the 146 MHz transmitter wasn't active. When the same test was performed using a dummy load, we didn't have the problem. I attributed this to IM generation in the antenna, although in further consideration, there are some other possibilities - IMG on the tower and/or in the lighting protector. All three systems experienced this, although to varying degrees. Not a scientific result, but might be a reason to not use a dual-band antenna on both bands. 73 Bob, KD7NM Not too long ago I installed a TRAM 1480 with the following connected to it: 2M TX, 2M RX (repeater) 445 TX, 440 RX (repeater) 420 TX, 430 RX (duplex link) All running at the same time. No desense. Bob NO6B PS: My first post to the group - joined yesterday -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of John W. Springman III - KB3AWQ Sent: Friday, August 29, 2008 9:12 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Diamond X-50 NA I use the X50A (same thing just N type connector) on the W3AHS-R repeater here in Williamsport, PA. I have used it since 2001 with no problems, in fact I have 2 of them up there and the 440 Link radio also shares it and have not had any problems. It is mounted on the roof of the high school which sit on top of a hill about 1000 ft. elev. I know another guy who has used it for an APRS digi up on the 2,000 ft Williamsport Bald Eagle mountain even before that and it is still holding. As far as the gain. Yeah its a little low but for UHF its a little higher. I have talked mobile to Laporte, base stations in Hazleton, mobile to Mill Hall and even on Route 80 at the Clinton/Centre County line and about 20 miles to the south (good ol 2000 ft mountain in the way). I guess you can see what I think of it. 73 John KB3AWQ Anyone have any opinions on the Diamond X-50NA? I have an application to use it for a simple repeater on UHF. Yahoo! Groups Links Yahoo! Groups Links
[Repeater-Builder] Re: Diamond X-50 NA
John, I have several of these up for repeaters here on the Oregon Coast. They hold up pretty well. I would recommend a top brace if they are in a harsh environment. I like their performance on UHF, they work very well for their size and price. On VHF they of course are a little lacking, and I have found they compare to the performance of one of the single Telewave broadband loops. We have one on a 4000' mountaintop that sees a fair amount of snow and ice and it has survived 2 winters up there so far. Hope this helps, Joe - WA7JAW --- In Repeater-Builder@yahoogroups.com, John Mackey [EMAIL PROTECTED] wrote: Anyone have any opinions on the Diamond X-50NA? I have an application to use it for a simple repeater on UHF.
