I am converting a few high split msf5000 VHF repeaters to rx 144.59 and tx 145.19 I have the rx vco model TRD1842 and tx vco model TTD1732
I need to conver them to the c367 option low split vco units of TRD1841 and TTD1731. The schematics/pictorial/parts list for the low split vco units.and/or modification information is needed. Its very likely someone has done this. If I get no help I will have to re engineer the units without any documentation or instructions( not easy). Thank you for any help or helpful suggestions.
Paul
MSF5000 VHF C367 Mod of high split to low split
Moderator: Queue Moderator
Re: MSF5000 VHF C367 Mod of high split to low split
Good luck.
Check your PMs.
Bob M.
Check your PMs.
Bob M.
Re: MSF5000 VHF C367 Mod of high split to low split
http://home.comcast.net/~n0oba1/RXVCO.JPG
http://home.comcast.net/~n0oba1/TXVCO.JPG
Project completed. Rx vco works down to 132.7mhz and tx vco easily down to 145mhz. Note in photos. At the ground end of each vco inductor line(lower just left of center). All 4 inductance trim paths are cut. On the upper tuning stub(runs across circuit board left-right just below board numbers). On the rx vco it was necessary to increase capacitance by running the added wire nearer to the top of board(do not let it touch the numbers as they are grounded). On the tx vco not as much capacitance was needed and just using all of the tune stub by bridging it was all that was needed. these modifications have now been done to 8 vco units here and all work fine on rx 144.59mhz, tx 145.19mhz. This is the Aurora colorado repeater pl code 3B (131.
and echo link node number 10079. Email if you have questions. Thanks to kcbooboo for his help with documents he sent me and to Scott n0oba the repeater owner(who does all the hard work).
Paul
http://home.comcast.net/~n0oba1/TXVCO.JPG
Project completed. Rx vco works down to 132.7mhz and tx vco easily down to 145mhz. Note in photos. At the ground end of each vco inductor line(lower just left of center). All 4 inductance trim paths are cut. On the upper tuning stub(runs across circuit board left-right just below board numbers). On the rx vco it was necessary to increase capacitance by running the added wire nearer to the top of board(do not let it touch the numbers as they are grounded). On the tx vco not as much capacitance was needed and just using all of the tune stub by bridging it was all that was needed. these modifications have now been done to 8 vco units here and all work fine on rx 144.59mhz, tx 145.19mhz. This is the Aurora colorado repeater pl code 3B (131.
and echo link node number 10079. Email if you have questions. Thanks to kcbooboo for his help with documents he sent me and to Scott n0oba the repeater owner(who does all the hard work). Paul
Re: MSF5000 VHF C367 Mod of high split to low split
Bob, thanks so much for all your help with the schematics you were able to provide for this project. Once Paul figured out what was needed we were able to get things running all the VCO's modified and everything appears to be working perfect! This was the only thing holding us up to get these running and the 145.19 group is very grateful. These are fine machines and going to make our lives easier.
Regards,
Scott Hilton
n0oba
Regards,
Scott Hilton
n0oba