Subject: Re: Re: TH-F7 - rig gone a bit deaf on UHF
Newsgroups: gmane.recreation.radio.hardware.kenwood.th-f7e
Date: 2006-07-11 23:45:54 GMT (2 years, 1 week, 23 hours and 15 minutes ago)
Prosze piszcie po Polsku ! ----- Original Message ----- From: "Fred" <glenndriech <at> yahoo.co.uk> To: <ken_th-f7e <at> yahoogroups.com> Sent: Monday, July 10, 2006 3:40 AM Subject: Re: [ken_th-f7e] Re: TH-F7 - rig gone a bit deaf on UHF > Check out the files section of Yahoo's TH-F6 and F7 > groups plus that link? > > Without interpreting the schematics I'd consider > myself at a disadvantage. It is best to prove cause > of fault, the mosfet remains an assumption, diodes and > other components may be involved and surface mount > repairs give few second chances. > > I'd recommend agents like Waters and Stanton or Martin > Lynch & Sons for warrented repair and test to current > spec. A chat with the service department may prove > useful. > > Regards, > > Fred. > > > > --- g8tzl2004 <g8tzl2004 <at> yahoo.com> wrote: > >> Thanks. I've done a few searches. I found a so >> called service manual >> but it mainly referred to the firmware. I'm looking >> for a PCB layout >> plan so that I can accurately locate the UHF front >> end MOSFET. Any >> ideas? I'd rather not rely on interpreting the >> schematics!! >> >> >> -- In ken_th-f7e <at> yahoogroups.com, Fred >> <glenndriech@...> wrote: >> > >> > Signals distribute via filters and switching >> diodes to >> > RF amps according to band. The circuitry doesn't >> seem >> > tolerant of bad antenna mismatch or disconnection >> when >> > transmitting. >> > >> > Some reviews mentioning this can be googled for >> and >> > see http://www.ham.dmz.ro/kenwood/th-f7e.php >> > >> > Fred. >> > >> > >> > --- g8tzl2004 <g8tzl2004@...> wrote: >> > >> > > I have noticed that my TH-F7 has gone a bit deaf >> on >> > > UHF. Its not >> > > completely deaf - maybe 15dB down. I connected >> an >> > > external pre-amp and >> > > the signals came up OK. The rig is deaf on both >> the >> > > A and B band. The >> > > VHF side of the radio is OK. >> > > >> > > Maybe the UHF front end MOSFET has blown? Is >> this a >> > > common problem? >> > > >> > > Thanks > > > > > ___________________________________________________________ > To help you stay safe and secure online, we've developed the all new > Yahoo! Security Centre. http://uk.security.yahoo.com >