Randy, Your obstervations are correct. GE simply added more boards/transistors to increase power from 35 to 60 to 110 watt. If you look in say a 60 watt most of the PA compartment is open with a coax going from the last board to the filter.
Most often simply changing a board is easier than changing the transistor. Changing the whole PA is also simple. When new it was probably expensive, but today cheap and there are lots of Mastr IIs around. Some repeater owners buy rigs for spares. Might consider it for your group. 73, ron, n9ee/r >From: "R. K. Brumback" <[EMAIL PROTECTED]> >Date: 2007/07/23 Mon PM 05:54:36 CDT >To: [email protected] >Subject: RE: [Repeater-Builder] GE 100 watt PA final transistors >Scott, >From an amateur approach this is how I would describe it. I am just now >learning about Mastr IIs. The PA appears to be in 3 stages and can be >separated physically into 3 different boards. The first board has 2 >transistors (4340P1 & 4340P2). The first board appears to drive the second >board which has one power transistor (4304P4). At the end of the second >board I can get 50 watts output power so I figured everything was good to >there. The 3rd board has two power transistors that appear to be in >parallel. From there it goes into what appears to be a matching network and >then on out to coax. The number on the board is PL19D424266G1 Rev B. From >what I understand about any 110 watt board will interchange even is the >configuration is different. Contact me personally at this email if you wish >and many thanks. [EMAIL PROTECTED] >Randy >W4CPT > > >-----Original Message----- >From: [email protected] >[mailto:[EMAIL PROTECTED] On Behalf Of Scott Zimmerman >Sent: Monday, July 23, 2007 3:31 PM >To: [email protected] >Subject: Re: [Repeater-Builder] GE 100 watt PA final transistors > >Randy, > >Since you have been struggling with this for a while now, tell me what style > >VHF PA you currently have (the 3 or 4 transistor final) and I can sell you a > >complete VHF 110W PA known working for MUCH, MUCH cheaper than that. Then >all you have to do is some transplanting. > >Scott > >Scott Zimmerman >Amateur Radio Call N3XCC >612 Barnett Rd >Boswell, PA 15531 > >----- Original Message ----- >From: "R. K. Brumback" <[EMAIL PROTECTED]> >To: <[email protected]> >Sent: Monday, July 23, 2007 2:38 PM >Subject: [Repeater-Builder] GE 100 watt PA final transistors > > >> >> I just got a quote back from Digitron Electronics on the MRF-247 final >> transistors for the VHF Mastr II. They want $80.00 EACH!! OUCH!!!!!!!! I >> nearly crapped in the chair. They had about 5,000 of them and I would say >> that is the reason they have so many. >> Randy >> KI4BQN >> >> >> >> No virus found in this outgoing message. >> Checked by AVG Free Edition. >> Version: 7.5.476 / Virus Database: 269.10.14/912 - Release Date: 7/22/2007 >> 7:02 PM >> >> >> >> >> >> >> >> Yahoo! Groups Links >> >> >> >> >> >> -- >> No virus found in this incoming message. >> Checked by AVG Free Edition. >> Version: 7.5.476 / Virus Database: 269.10.14/912 - Release Date: 7/22/2007 > >> 7:02 PM >> >> > > > > > > >Yahoo! Groups Links > > > > >No virus found in this incoming message. >Checked by AVG Free Edition. >Version: 7.5.476 / Virus Database: 269.10.14/912 - Release Date: 7/22/2007 >7:02 PM > > >No virus found in this outgoing message. >Checked by AVG Free Edition. >Version: 7.5.476 / Virus Database: 269.10.14/912 - Release Date: 7/22/2007 >7:02 PM > > > > > > > >Yahoo! Groups Links > > > Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
