"Howard Traxler" <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- Thanks Garey, I read that when you first posted it; but I guess I didn't understand it, the part about the filters anyway. Guess I'll put the R-4C back on the bench and do some listening. Is there a way to make it (or the R-4A tranceive with the TR-4? I don't know which model of the tR-4 I have but it works just fine except the receiver is too wide for me on SSB and too narrow on AM.
Thanks again. 73, de Howard, WA9RYF ----- Original Message ----- From: "Garey Barrell" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, November 29, 2007 8:52 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 : ---------------------------------------------------------------------- : : : -- : No virus found in this incoming message. : Checked by AVG Free Edition. : Version: 7.5.503 / Virus Database: 269.16.9/1157 - Release Date: 11/28/2007 12:29 PM : : ---------------------------------------------------------------------- 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 ----------------------------------------------------------------------
