re[2]: [Repeater-Builder] HELP: 2 meter repeater intermod problem from pager tr
At 12/21/2004 10:09 AM, you wrote: John, Since I am the guy running the IRLP node you refer to, I thought I might take a moment to reply. The equipment now consists solely of Motorola GM300's, not amateur grade equipment. For the last six months or more both the 2m and 440 transmitters have had large cavity filters in place. I believe you may still be thinking of the original experimental equipment used for proof of concept. The 2m cavity is a Sinclair 10 diameter unit. As for the deviation I have measured it with a Motorola Model 2600 service monitor at 6 KHz, about the same as other repeaters in this area. Just curious as to why you ( the other repeaters in your area for that matter) run more than the almost universally-accepted NBFM standard of 5 kHz peak deviation? At 6 kHz, I think even 20 kHz channel spacing begins to experience adjacent-channel interference. I say almost because here in SoCal 4.2 kHz is the standard on 2 meters in order to get 15 kHz spacing to work right. 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[2]: [Repeater-Builder] HELP: 2 meter repeater intermod problem from pager tr
John, Since I am the guy running the IRLP node you refer to, I thought I might take a moment to reply. The equipment now consists solely of Motorola GM300's, not amateur grade equipment. For the last six months or more both the 2m and 440 transmitters have had large cavity filters in place. I believe you may still be thinking of the original experimental equipment used for proof of concept. The 2m cavity is a Sinclair 10 diameter unit. As for the deviation I have measured it with a Motorola Model 2600 service monitor at 6 KHz, about the same as other repeaters in this area. The node can be heard 100 miles away in some directions by mobiles and those same mobiles running 75 watts, about the same as the node transmitter output, can be heard as well. As for the frequency, I'm running a SIMPLEX node on a SIMPLEX frequency. I just thought I'd bring you up to date and suggest that you check your facts next time. Sincerely, Michael Bloom W7RAT 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: re[2]: [Repeater-Builder] HELP: 2 meter repeater intermod problem from pager tr
I guess the callsign explains it all. --- mbloom0947 [EMAIL PROTECTED] wrote: John, Since I am the guy running the IRLP node you refer to, I thought I might take a moment to reply. The equipment now consists solely of Motorola GM300's, not amateur grade equipment. For the last six months or more both the 2m and 440 transmitters have had large cavity filters in place. I believe you may still be thinking of the original experimental equipment used for proof of concept. The 2m cavity is a Sinclair 10 diameter unit. As for the deviation I have measured it with a Motorola Model 2600 service monitor at 6 KHz, about the same as other repeaters in this area. The node can be heard 100 miles away in some directions by mobiles and those same mobiles running 75 watts, about the same as the node transmitter output, can be heard as well. As for the frequency, I'm running a SIMPLEX node on a SIMPLEX frequency. I just thought I'd bring you up to date and suggest that you check your facts next time. Sincerely, Michael Bloom W7RAT Yahoo! Groups Links http://groups.yahoo.com/group/Repeater-Builder/ [EMAIL PROTECTED] __ Do you Yahoo!? The all-new My Yahoo! - What will yours do? http://my.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: re[2]: [Repeater-Builder] HELP: 2 meter repeater intermod problem from pager tr
Hi Michael- Last time you I talked (about 3 months ago) you said you were running amateur grade gear on your IRLP node at the KOIN-TV tower. Apparently you recently changed to commercial grade gear, which is a good thing! Also, the last time you I talked you REFUSED the suggestion of using cavity filters on your transmittes because it would prevent you from being frequency agile. Apparently you decided to change this also? Those are good moves, Michael. Those actions will go a long way to resolving the interference problems that have been associated with your IRLP node. Perhaps, that is all that was needed! But I really think you should re-check your deviation reports. The repeaters in this area are not running 6 KHz deviation. Good amateur practice for practically all voice repeaters is about 4.5 KHz deviation or no more than 5 Khz MAX. Your suggestion of 6 KHz deviation is roughly 20-25% over. On the other hand, that is far better than the 9 KHz deviation for your system (as checked by Dalcomm) as you stated in your previous e-mail to me a few months ago. I have attached that e-mail immediately below. -- Original Message -- Received: 03 September 2004 From: mbloom0947 [EMAIL PROTECTED] Dear John, Thank you for your response. Actually, we did use a radio communications company called Dalcomm Communications, who are very experienced in this sort of thing and quite well equipped. I checked back with them and learned that the PEAK deviation (not the average) was 9 KHz. Of course the average deviation would depend upon an integration of the signal over time and would be dependent upon the nature of the source audio. I do appreciate your offer to do the measurements and acknowledge that you have made this kind offer in the past. The reason I chose to use Dalcomm was that I wanted the measurements to be made by an independent company with no preconceived notions whose only interest is to provide accurate result. Sincerely Michael Bloom W7RAT -- Original Message -- Received: Tue, 21 Dec 2004 04:55:31 PM CST From: mbloom0947 [EMAIL PROTECTED] Since I am the guy running the IRLP node you refer to, I thought I might take a moment to reply. The equipment now consists solely of Motorola GM300's, not amateur grade equipment. For the last six months or more both the 2m and 440 transmitters have had large cavity filters in place. I believe you may still be thinking of the original experimental equipment used for proof of concept. The 2m cavity is a Sinclair 10 diameter unit. As for the deviation I have measured it with a Motorola Model 2600 service monitor at 6 KHz, about the same as other repeaters in this area. The node can be heard 100 miles away in some directions by mobiles and those same mobiles running 75 watts, about the same as the node transmitter output, can be heard as well. As for the frequency, I'm running a SIMPLEX node on a SIMPLEX frequency. I just thought I'd bring you up to date and suggest that you check your facts next time. Sincerely, Michael Bloom W7RAT 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/
