Al, On a related subject, I have a problem on my R4-B that has been bugging me. The LSB response is down several S units from the USB response. This is AFTER a careful alignment of the radio per the manual using lab grade equipment, including tweaking the passband adjustments (I have done these on several other R4-X radios with great results). The selectivity seems to work normally, except for the asymmetry. I did skip para 6.4.4 part 8, the crystal filter "wire twisting" adjustment - could this filter response be related (roofing filter drift, etc)?
I did not dig into the radio to pin down the problem, but would like your (or anyone else's) thoughts if you have seen this before or have a suggestion where to look. Otherwise, it's a beautiful receiver. 73, Rocco N6KN ----- Original Message ----- From: "Al Parker" <[EMAIL PROTECTED]> To: "Tom Laird" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]> Sent: Thursday, November 27, 2003 8:52 PM Subject: Re: [drakelist] TR-4 with one distorted sideband > > HI Tom, > > Jim Quinn has mentioned the early soupcan filters. I rean some tests > on 3 of them a few yrs ago, I've pasted them in below, you may need to > adjust for the margins. The info may answer some of your questions on > freq., etc. You should make sure your carrier freq. is, in fact, inside > the upper & lower freqs., and centered. I've had one that fell outside, > and the filters were OK. > > I have run tests on 3 different "soupcan" filters, to > determine actual frequency, and loss. Input & output were each loaded > with 3300 ohms. URM 25D signal generator, Tektronics 453 scope, DSI 5600A > freq. ctr used as test instruments. > >. . . ---------------------------------------------------------------------- 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/ ----------------------------------------------------------------------
