Re: [Repeater-Builder] Radio conversion to 225MHZ
K5IN wrote: Kevin, Any suggestions for a decent quality 220mhz amp for repeater duty? Micor 20-25 watts drive or pull the PA and exciter in and 50-60 watts output? For 50 watts, we use two Japanese power modules and Wilkinson power dividers for splitting and combining. We build an IPA that supplies the required drive for the two modules, it's a one transistor buffer that puts out about 1 watt but it's output is variable from 1/2 watt to 1 watt. This drives the two modules in parallel and the output is combined with another Wilkinson. I think Scott has pictures - it was never officially written up that I'm aware of. Kevin
Re: [Repeater-Builder] Radio conversion to 225MHZ
Kevin Custer wrote: it's a one transistor buffer that puts out about 1 watt but _it's_ output is variable Yea... _its_ out is variable - not _it is_ output is variable... Long Day! Kevin
Re: [Repeater-Builder] Radio conversion to 225MHZ
We used a TU-50 splitter and two SAV-15 power modules and modified the existing driver. We ended up with about 73 watts and turned it down a bit. Also used a form of the Wilkinson combiner for the outputs. We ground and polished the existing heat sink to mount the modules on and we know it's just about bullet proof. One at least two occasions the RC-210 controller keyed it all night. No problem. You can read all about it on K7IOU Dave's page http://home.comcast.net/~micorrepeater/ de WD7F John in Tucson - Original Message - From: Kevin Custer kug...@kuggie.com To: Repeater-Builder@yahoogroups.com Sent: Friday, October 16, 2009 6:08 PM Subject: Re: [Repeater-Builder] Radio conversion to 225MHZ K5IN wrote: Kevin, Any suggestions for a decent quality 220mhz amp for repeater duty? Micor 20-25 watts drive or pull the PA and exciter in and 50-60 watts output? For 50 watts, we use two Japanese power modules and Wilkinson power dividers for splitting and combining. We build an IPA that supplies the required drive for the two modules, it's a one transistor buffer that puts out about 1 watt but it's output is variable from 1/2 watt to 1 watt. This drives the two modules in parallel and the output is combined with another Wilkinson. I think Scott has pictures - it was never officially written up that I'm aware of. Kevin Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.421 / Virus Database: 270.14.20/2441 - Release Date: 10/16/09 18:39:00
[Repeater-Builder] Radio conversion to 225MHZ
Has anyone converted any of the commercial (GE/Motorola) radios to the 220 band? If so what works and what doesnt. I need several 225 radios and thought this might be a route to go. Thanks in advance Jim
Re: [Repeater-Builder] Radio conversion to 225MHZ
I did a Micor mobile once (VHF-Hi to 220) It was a lot of work and the PA won't convert, so you need to address that. Also did a GE MPI portable, Came out okay, but a rock bound 2 watt, 2 channel portable is not really worth the effort, given the cost of Icom 3ATs etc. Not sure about the newer stuff. GL de W1EL Eric Lowell Eastern Maine Electronics Inc. 48 Loon Road Wesley ME 04686 eme@starband.net www.satnetmaine.com --- On Wed, 10/14/09, J aat...@yahoo.com wrote: From: J aat...@yahoo.com Subject: [Repeater-Builder] Radio conversion to 225MHZ To: Repeater-Builder@yahoogroups.com Date: Wednesday, October 14, 2009, 7:41 PM Has anyone converted any of the commercial (GE/Motorola) radios to the 220 band? If so what works and what doesnt. I need several 225 radios and thought this might be a route to go. Thanks in advance Jim
Re: [Repeater-Builder] Radio conversion to 225MHZ
I have several Mitsubishi 220 PA Hybrid Modules. 100 mW in, 20~25 W out. $30 each. I have a friend that made some interface PCBs, not essential, but handy. I'll ask him what he wants for them if anyone is interested. Eric Lowell wrote: I did a Micor mobile once (VHF-Hi to 220) It was a lot of work and the PA won't convert, so you need to address that. Also did a GE MPI portable, Came out okay, but a rock bound 2 watt, 2 channel portable is not really worth the effort, given the cost of Icom 3ATs etc. Not sure about the newer stuff. GL de W1EL Eric Lowell Eastern Maine Electronics Inc. 48 Loon Road Wesley ME 04686 eme@starband.net www.satnetmaine.com --- On *Wed, 10/14/09, J /aat...@yahoo.com/* wrote: From: J aat...@yahoo.com Subject: [Repeater-Builder] Radio conversion to 225MHZ To: Repeater-Builder@yahoogroups.com Date: Wednesday, October 14, 2009, 7:41 PM Has anyone converted any of the commercial (GE/Motorola) radios to the 220 band? If so what works and what doesnt. I need several 225 radios and thought this might be a route to go. Thanks in advance Jim -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
Re: [Repeater-Builder] Radio conversion to 225MHZ
J wrote: Has anyone converted any of the commercial (GE/Motorola) radios to the 220 band? If so what works and what doesnt. I need several 225 radios and thought this might be a route to go. I have converted MASTR II Mobiles, both multiplier and PLL exciter, with standard receivers to 220 MHz. - they work fine, the PLL is easier. There are preferred instructions on the MASTR II conversion site: http://www.repeater-builder.com/rbtip/geindex.html#220 For the M2 with a PLL exciter, Scott sells a complete conversion kit: http://www.repeater-builder.com/products/MIIconversionkit.html The PA's won't convert, but there is an easy fix: http://www.repeater-builder.com/products/ampbd.html I have converted MICOR Mobiles and Stations to 220 MHz. - they also work fine. There are preferred instructions on the MICOR conversion site: http://www.repeater-builder.com/rbtip/micor-index.html#220 Helical Resonators modified for 220 operation are available here: http://www.repeater-builder.com/products/ The PA's won't convert, but again - never fear, the amp board is the solution: http://www.repeater-builder.com/products/ampbd.html Any of the above radios can be converted to 220 MHz and achieve book specification sensitivity on the new band. My favorite is the MICOR. Hope this helps... Kevin Custer
RE: [Repeater-Builder] Radio conversion to 225MHZ
Kevin, Any suggestions for a decent quality 220mhz amp for repeater duty? Micor 20-25 watts drive or pull the PA and exciter in and 50-60 watts output? Thanks -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Kevin Custer Sent: Wednesday, October 14, 2009 5:57 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Radio conversion to 225MHZ J wrote: Has anyone converted any of the commercial (GE/Motorola) radios to the 220 band? If so what works and what doesnt. I need several 225 radios and thought this might be a route to go. I have converted MASTR II Mobiles, both multiplier and PLL exciter, with standard receivers to 220 MHz. - they work fine, the PLL is easier. There are preferred instructions on the MASTR II conversion site: http://www.repeater-builder.com/rbtip/geindex.html#220 http://www.repeater-builder.com/rbtip/geindex.html#220 For the M2 with a PLL exciter, Scott sells a complete conversion kit: http://www.repeater-builder.com/products/MIIconversionkit.html http://www.repeater-builder.com/products/MIIconversionkit.html The PA's won't convert, but there is an easy fix: http://www.repeater-builder.com/products/ampbd.html http://www.repeater-builder.com/products/ampbd.html I have converted MICOR Mobiles and Stations to 220 MHz. - they also work fine. There are preferred instructions on the MICOR conversion site: http://www.repeater-builder.com/rbtip/micor-index.html#220 http://www.repeater-builder.com/rbtip/micor-index.html#220 Helical Resonators modified for 220 operation are available here: http://www.repeater-builder.com/products/ http://www.repeater-builder.com/products/ The PA's won't convert, but again - never fear, the amp board is the solution: http://www.repeater-builder.com/products/ampbd.html http://www.repeater-builder.com/products/ampbd.html Any of the above radios can be converted to 220 MHz and achieve book specification sensitivity on the new band. My favorite is the MICOR. Hope this helps... Kevin Custer
