I was able to change the bandsplits in the RSS using the info provided here in Batlabs. I added a 120k resistor and also a 220k resistor. The 120k resistor allows me to go down to about 918 with receive and transmit lock. I have several channels that are 908 and 906 transmit but can't get a lock. Any suggestions. My transmit range is 906-921. Receive is 918-921. Thanks.
Jason
Spectra 900 MHZ Ham Conversion
Moderator: Queue Moderator
Jason,
If at all possible - consider having your local coordinator revisit the 900 band plan issue. The old ARRL band plan was copied from the plan originally developed by SCRRBA (Southern Calif Repeater & Remote Base Assn). They have since changed to a 25 MHz repeater split with outputs at 927.xxxx with 12.5 KHz spacing. Recent ARRL directories state: "A new band plan is under development that reflects our need to not cause interference to AVM systems at 904-912 MHz and 918-926 MHz." Although ARRL has yet to act, most of the country is going to this new plan. Check out the 902 group @ yahoo.
If you are stuck with needing to talk to an in place system on the old band plan, Spectra may not be the way to go. The front end rolls off sharply below 927. I have yet to see anyone present a source for a direct replacement for the filters in Spectra.
Maxtrac will go wherever you want in the band with the mods shown on Batlabs and with available exact fit replacement filters. You can get 900 Maxtracs even cheaper than Spectras.
If at all possible - consider having your local coordinator revisit the 900 band plan issue. The old ARRL band plan was copied from the plan originally developed by SCRRBA (Southern Calif Repeater & Remote Base Assn). They have since changed to a 25 MHz repeater split with outputs at 927.xxxx with 12.5 KHz spacing. Recent ARRL directories state: "A new band plan is under development that reflects our need to not cause interference to AVM systems at 904-912 MHz and 918-926 MHz." Although ARRL has yet to act, most of the country is going to this new plan. Check out the 902 group @ yahoo.
If you are stuck with needing to talk to an in place system on the old band plan, Spectra may not be the way to go. The front end rolls off sharply below 927. I have yet to see anyone present a source for a direct replacement for the filters in Spectra.
Maxtrac will go wherever you want in the band with the mods shown on Batlabs and with available exact fit replacement filters. You can get 900 Maxtracs even cheaper than Spectras.
I figure this site may come in handy,
http://www.arrl.org/nfcc/coordinators.htm
at least you have an email contact for SCRRBA.
http://www.arrl.org/nfcc/coordinators.htm
at least you have an email contact for SCRRBA.
Working the graveyard shift its about 1am. Anyway I would contact the Coordinator at the top of this text page! Dave Karr, KA9FUR Waukesha, WI 53189 ka9fur@arrl.net As of a few years ago 900Mhz Ham, was still experimental, so a ham would contact you if theres any interference before the FCC jumps in. Look around these links
http://www.wi-repeaters.org/
http://www.wi-repeaters.org/DirByFreq.txt Simplex, I would try 906.000mhz but don't wait to shoot an email off to the dude above! Ask him the same question, where can you test some simplex freqs. on? He's supposed to help you! Ed (back to work)
<font size=-1>[ This Message was edited by: radioEd on 2002-01-24 02:50 ]</font>
http://www.wi-repeaters.org/
http://www.wi-repeaters.org/DirByFreq.txt Simplex, I would try 906.000mhz but don't wait to shoot an email off to the dude above! Ask him the same question, where can you test some simplex freqs. on? He's supposed to help you! Ed (back to work)
<font size=-1>[ This Message was edited by: radioEd on 2002-01-24 02:50 ]</font>
Jason, I don't know where you are in WI. But it looks like 900Mhz is wide open!
http://home.dwave.net/~wvra/
I went to the above link, & checked out the major cities, & I see nothing.. But just because its not listed, dosen't mean its not being used! you should have no prob. working with the Coordinator.. also
PRELIMINARY WAR Band Plan - Acrobat PDF Format under this link:
http://www.wi-repeaters.org/forms.htm List about 20 900Mhz machines, SSTV, Beacons, Look around! let me know how you make out? 73's Ed
http://home.dwave.net/~wvra/
I went to the above link, & checked out the major cities, & I see nothing.. But just because its not listed, dosen't mean its not being used! you should have no prob. working with the Coordinator.. also
PRELIMINARY WAR Band Plan - Acrobat PDF Format under this link:
http://www.wi-repeaters.org/forms.htm List about 20 900Mhz machines, SSTV, Beacons, Look around! let me know how you make out? 73's Ed
Hi Jason,
If you're planning on using commercial-type radios like Motorola Maxtrac, GTX, etc., it will be easier to use the 927 end of the band for simplex. Here in AZ, we use repeaters with a 25 mHz "split", with 902 input, 927 output, and use either the repeater output or 927.500 for simplex. Most of these radios won't receive well at 906 without major surgery. But do contact your local coordinator - they should know if there is any local activity.
73 DE Hartley W1OQ/7
If you're planning on using commercial-type radios like Motorola Maxtrac, GTX, etc., it will be easier to use the 927 end of the band for simplex. Here in AZ, we use repeaters with a 25 mHz "split", with 902 input, 927 output, and use either the repeater output or 927.500 for simplex. Most of these radios won't receive well at 906 without major surgery. But do contact your local coordinator - they should know if there is any local activity.
73 DE Hartley W1OQ/7