Eric and all, On the PA problem has anyone on the board tried using PAs from say Micors or GE Mastr line made for 150 or UHF on 220.
These often have LPF on their output which can be taken out (don't like to). Since these amps are wide band they just might move up/down to 220. Some do have tuning like in the Micor so would be little harder, but GEs only have a pot for adjusting drive/output and some with SWR shutdown circuit adjustments. 73, ron, n9ee/r >From: Eric Lemmon <[EMAIL PROTECTED]> >Date: 2007/07/12 Thu PM 10:21:34 CDT >To: [email protected] >Subject: RE: [Repeater-Builder] Hamtronics > >Gene, > >I recently converted a UHF Hamtronics REP-200 repeater to 220 MHz by >changing the receiver, exciter, and power amplifier to the 220 versions. It >is working well, and has not had any problems. The only reason why I did >this was because neither Motorola nor Kenwood offered a commercial-grade >repeater for the 220 Amateur band. > >In my opinion, the major deficiency in Hamtronics repeaters is the >bare-bones power amplifier. These units have no power regulation and no >high-VSWR protection. I know of two Hamtronics 2m repeaters that suffered >blown PAs due to antenna problems. With no protection against high VSWR, >the PA transistor smoked. To prevent that from happening in my "new" 220 >repeater, I installed a Telewave single ferrite isolator to maintain a >constant impedance load seen by the PA. > >Rather than buy a Hamtronics 2m repeater, I'd go for a Motorola R1225 >full-duplex transceiver. You get commercial quality and a complete >controller in a package that has more power, and for less money than the >Hamtronics package. > >73, Eric Lemmon WB6FLY > >-----Original Message----- >From: [email protected] >[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] >Sent: Wednesday, July 11, 2007 10:28 PM >To: [email protected] >Subject: [Repeater-Builder] Hamtronics > >Anyone with experience with the Hamtronics 200 or 200T repeater please >advise of your satisfaction rating/comments. . > >We are considering one for the local ARES standby repeate and your inputs >are important.. > >Thanks in advance. > >Gene > > Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
