"EP Swynar" <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- Hi Garey,
In the matter of the TRANSMITTER half of the classic "Drake Twins" over the years, did the T-4 --- and all of its different versions / generations over the years --- always include 160-meters...? Or was that band deleted at some point in time...? I have my sites presently set on what I THINK is the early EARLY version of the Twins, and 160-meters is an absolute MUST HAVE for me here... Many thanks in advance for your guidance & counsel...! ~73~ Eddy VE3CUI - VE3XZ ************************************* ----- Original Message ----- From: "Garey Barrell" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, November 29, 2007 9:52 PM Subject: Re: [drakelist] R-4A vs R-4C > > Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang > ---------------------------------------------------------------------- > Howard - > > Here's an extract from an earlier post I made about the R-4 series > receivers. > > The R-4 is almost a 2-B, just with a linear PTO and 1 kHz dial > calibration. All tubes. Very similar in operation, and will > transceive with the matching T-4X for an excellent CW station. Four > filter bandwidths, (400, 1200, 2400 and 4800 Hz,) passband tuning, noise > blanker, LC notch and 100 kHz crystal calibrator built in. > > The R-4A (early 13 tube model) is an improved R-4, almost identical > specifications. PTO and Band Oscillators converted to solid state. > > The R-4A (late 11 tube model) almost identical specifications. Product > detector, BFO, AGC and low level audio stages converted to solid state. > > The R-4B (early) is very similar to the late R-4A, minor modifications > and crystal calibrator multivibrator for 25 kHz markers. > > The R-4B (late) almost identical except PTO changed from bipolar to FET. > > The R-4C (early) very similar, except IF filters changed to crystal > filters. Only the 2.3 kHz filter is standard, 250, 500, 1800, 4000 and > 6000 Hz BW are available as options. The 4000 & 6000 Hz filters are > normally installed in a special socket under the chassis and are > effective on AM only. Four position filter switch. The noise blanker > was optional. Entire audio chain solid state, tubes used only from RF > to IF, all other stages and oscillators solid state. > > The R-4C (late) same. Five position filter switch. > > The 2-B through the R-4B used L-C filters in the IF. This type of > filter has much gentler slopes, which means that nearby signals are > still heard, just at reduced levels. The crystal filters are steep > sided, more like the crystal filters in today's receivers. > Personally, I prefer the L-C filters for all except heavy duty contest > use. I like to hear what is going on around my frequency, instead of > "listening with blinders on"... > > The T-4 series transmitters are all pretty much the same, the T-4X had 4 > pole crystal filters while the T-4XB and C had 8 pole filters. The > later ones therefore had slightly better carrier and unwanted sideband > suppression, neither of which has ANY effect on CW operation. > ANY 4 series receiver will transceive with ANY 4 series transmitter, mix > and match. There are minor things like the B line had a neon indicator > light under the dial to show which PTO was controlling in transceive > while the C line just turned the dial lamps on or off. The R-4 and R-4A > had neither, so you had to look at the switch! > > My opinion..... The R-4B is probably the best receiver overall. It has > great audio, smooth AGC, all the filters and noise blanker are built > in. The L-C filters are not quite as "drop off the table" selective, > but I prefer that for casual QSOs. > > The R-4C has poorer audio, a little harsher, the "better" (?) crystal > filters are extra, and the noise blanker is extra. > > The R-4 and R-4A are just earlier iterations of the R-4B, and are not > quite as refined, although some say they prefer the early R-4A to the > R-4B because the tube type product detector in the R-4A is "cleaner". > > 73, Garey - K4OAH > Glen Allen, VA > > Drake 2-B, 4-B & C-Line Service Supplement CDs > <www.k4oah.com> > > > > Howard Traxler wrote: > > "Howard Traxler" <[EMAIL PROTECTED]> made an utterance to the drakelist gang > > ---------------------------------------------------------------------- > > Hi again all. Here's a question that will require, probably a subjective > > answer: > > > > For about 30 years, I used an R-4A and loved it. I now aquired an > > R-4C--without any of those plug-in filters. I don't like it much at all. > > So I got another R-4A and was hoping to tweak it up to be like the one I > > used to have. > > > > Question: Why did I not need those filters in the R-4A and will I like the > > R-4C more if I get the filters for it? Which receiver should I put my > > effort into? I like to work both SSB and CW. > > > > Thoughts anyone? Thank you much. > > > > 73, DE Howard, WA9RYF > > > > > > ---------------------------------------------------------------------- > Submissions: [EMAIL PROTECTED] > Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body > Hopelessly Lost: [EMAIL PROTECTED] - help in body of message > Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > ---------------------------------------------------------------------- ---------------------------------------------------------------------- Submissions: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ----------------------------------------------------------------------
