Hi All, Does anyone know the Bourns (also Dale maybe?) 10 turn pot part number that will drop into the TR-7? I have been wanting to do that for a while. Those one turn guys are just too touchy. Thanks.
73, Jack WA9NQW On Dec 12, 2009, at 1:50 PM, K8AC wrote: > Make sure to check the 10V adjustment FIRST! This affects everything and is > the reason you need to use the PBT to tune in SSB. The Service Manual covers > that well and shows it as the first step. The adjustment pot is on the > power supply board and easy to bump, throwing everything that depends on the > 10V line off. As I mentioned in a previous email, the real solution to that > repeating problem is to replace the adjustment pots on the power supply board > with multi-turn Bourns pots which won't change value when bumped or vibrated. > > 73, Floyd - K8AC > > ----- Original Message ----- From: "Adrian Rees (MW1LCR)" > <[email protected]> > To: "'[email protected]'" <[email protected]> > Sent: Saturday, December 12, 2009 2:25 PM > Subject: Re: [Drakelist] TR7 Help please > > >> Hello everyone >> >> I have now stripped & cleaned the Molex connectors,and all the connectors on >> the Digital display board. >> This leaves >> >> So far my TR7 is now receiving on all bands apart from 28MHz. I injected a >> signal on the amateur bands at 1uV and this was certainly discernable. >> However, still no 28MHz and now 7MHz appears to be starting at 8MHz and I >> press the "down" button twice to get to 7MHz. Changing the band switch up or >> down and then returning to 7MHz does the same...ie 8MHz.So I guess further >> board cleaning is called for tomorrow.I'll finish off the connectors and >> switches tomorrow. >> >> I tried the RX sie of things and noticed that the PBT is needed to resolve >> an SSB signal, so I guess I need to look at that as well. >> >> I'll get the receive side going on all bands first, then look at alignment & >> voltages. >> >> Thanks all for the help so far. >> >> Regards >> >> Adrian MW1LCR >> -----Original Message----- >> From: [email protected] [mailto:[email protected]] >> On Behalf Of Adrian Rees (MW1LCR) >> Sent: 12 December 2009 09:27 >> To: '[email protected]' >> Subject: Re: [Drakelist] TR7 Help please >> >> >> Hello everyone >> >> Thank you all for your replies, both on and off list. >> >> I'll start by stripping & cleaning the PC Board connectors, as per the many >> suggestions I received. >> >> Over here in the UK, we have a product called Servisol, which I guess is the >> same as your Dexoit. Both switch & contact cleaners. >> >> The guy I bought the TR7 from had started restoring the radio and had >> changed two transistors, before stopping work on it. These were two >> transistors are in the power supply section, specifically Q2104 and Q2105 >> (TIP31). >> >> He had also acquired two spare boards for the radio, an IF Switching board >> and what appears to be a interstage RF amplifier, identified by the serial >> C3988W on the board. >> >> I'll clean the connectors and see what we have got then. >> >> Since it's a week or two before Christmas, and we live up in the hills, the >> XYL wants to go shopping, so its doubtful I'll achieve much on it today, >> although I may have time this evening, between contacts in the UBA Low Band >> contest which is on tonight & tomorrow morning.(I'm running my rebuilt FT102 >> & Dentron Linear for a bit of nostalgia !) >> >> Best wishes & many thanks ! >> >> Adrian MW1LCR >> >> North Wales. >> >> >> >> _______________________________________________ >> Drakelist mailing list >> [email protected] >> http://mailman.zerobeat.net/mailman/listinfo/drakelist >> >> >> _______________________________________________ >> Drakelist mailing list >> [email protected] >> http://mailman.zerobeat.net/mailman/listinfo/drakelist > > > _______________________________________________ > Drakelist mailing list > [email protected] > http://mailman.zerobeat.net/mailman/listinfo/drakelist _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
