Hi Pierre: I wouldn't worry about using your TR7 on 30m, 17m, or 12m amateur bands. It will work just fine as it came from Drake. No adjustment of the low-pass filters are necessary. Unless you have reason to suspect the filters have been tampered with, I wouldn't worry.
I might point out that the TR7 was repackaged for commercial and marine service and called the TR77 and TR-4310. These radios were used just about everywhere but the amateur bands. The only difference I know of between these radios and the TR7 was the PTO was replaced with a synthesizer similar (if not identical) to the RV75. Pierre, you have discovered one of the drawbacks to a free and open Internet: Anyone can post any sort of nonsense they want. You did the right thing to ask. 73, Russ WB8ZCC ----- Original Message ----- From: "Pierre Rothenburger" <[EMAIL PROTECTED]> To: "AF2C" <[EMAIL PROTECTED]>; "Drakelist" <[EMAIL PROTECTED]>; "Graf Ulrich ICM MP PD ST 2 ULM 1" <[EMAIL PROTECTED]> Cc: "Konrad Dienel" <[EMAIL PROTECTED]> Sent: Monday, May 03, 2004 3:46 PM Subject: Re: [drakelist] Aux 7 IC's > > It seems to me that we have two seperate questions ongoing here - - and > answers : > > 1° emulating/programming Aux-7 board . 2° Emission out of Ham-bands or > WARC ( though a consequence of 1°). > > For the 1st part I saw indeed on a webpage a diodes programming/soldering > scheme, but I never used it as I have got a Aux-7 board waiting still to be > mounted. > > 2° But the 2nd part from Ulrich , DK4SX, scares me. Is it so that out of > former standard Ham-bands, those fixed filternetworks mismatch the PA and > the 50 Ohm output? > > More specifically : Is there a mismatch between the pair of PA MOSFETS > output impedance and the following input-impedance of those filterbanks ? > If so what is an estimate of that mismatch ( SWR?). Does it eventually kill > the MOSFETS.( I bought a faulty TR7 - consciously ! - which turned out to > have dead PA transistors , including their drivers . I don' t why there > were. Who wants this to happen again? > > So what Ulrich wrote might well be an issue (for us Hams on WARC) but > wonder whether Drake wouldn' t have addressed this in the first place as > these rigs weren't designed for Std- Ham - bands applications only but I > beleive for the whole shortwave range as well? > > In short, what is the experience out there on WARC bands w.r.t above issue ( > part 2°)? > > 73's > > Pierre. > F3WT > > > > > > le 3/05/04 18:26, AF2C à [EMAIL PROTECTED] a écrit : > > > > > It is highly unlikely that any modification and/or adjustment be made to > > the Low Pass filters in the the TR-7 when modified using the "clad cutting" > > method. > > > > Drake announced the use of clad cutting as an alternative to the Aux-7 > > boards and chips which were not going to be produced in the future. The > > mod came from Drake, not from an outside source. > > > > I have a late production TR7 upgraded to TR7A by Drake and it utilizes the > > cutting the clad. The rig has been in use with no problems relative to the > > modification. > > > > BTW. I have an AUX-7 Board less the chips sitting in its original > > box. Never used it. > > > > There are some ICOMs which have the problem Graf mentions when opened...But > > that's ICOM. > > > > 73, > > Jay/AF2C > > > > ------------------------------------------------------------------ ---- > > Submissions: [EMAIL PROTECTED] > > Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body > > Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body > > Hopelessly Lost: [EMAIL PROTECTED] - help in body of message > > Brought to you courtesy of TLCHost.net http://www.tlchost.net/ > > ------------------------------------------------------------------ ---- > > > ------------------------------------------------------------------ ---- > Submissions: [EMAIL PROTECTED] > Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body > Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body > Hopelessly Lost: [EMAIL PROTECTED] - help in body of message > Brought to you courtesy of TLCHost.net http://www.tlchost.net/ > ------------------------------------------------------------------ ---- > ---------------------------------------------------------------------- Submissions: [EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ ----------------------------------------------------------------------
