"Bollini, Maurizio" <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- Garey, you said:
"The T-4X SSB signal is a little "dirty" by today's standards. " Is it true as well for the TR-any line? It is because of poor bandpass filter shape (low number of poles) or because of poor low pass filtering out the final stage (I mean harmonic content). Or other? Ciao Maurizio. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Garey Barrell Sent: martedì 7 giugno 2005 18.04 To: DW Holtman Cc: drakelist@www.zerobeat.net Subject: Re: [drakelist] Drake Differences Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- DW - The primary difference between the R-4 and the R-4B is the number of circuits that are solid-state vs tube. Functionally they are pretty much identical. The R-4 is very much like the 2-B with a linear PTO, all tube circuitry, with just a couple of SS diodes. The "early" R-4A converted a few stages to SS, most notably the PTO with a bipolar transistor, the "late" R-4A a few more circuits went SS. The R-4B converted a few more to SS, and the PTO to an FET. They all used a single frequency dial with 1 kHz marks on the knob skirt, the same Bandpass tuner, and the same basic knob arrangement. The late A and all Bs used the color coded carrier oscillator crystals to improve the "transceive align" stability with the transmitter. Most agree that the late B is the "best", being the final refinement of the design. It still had 10 tubes. Some claim the A has a better (tube based) product detector and lower distortion, but I'm hard pressed to tell the difference. By comparison, the R-4C has only five tubes left. The transmitters are all very similar, with similar improvements in the PTO by going from tube, to bipolar, to FET. The only significant change in the transmitters is the change from 4 pole crystal filters in the T-4X to 8 pole in the T-4XB, improving the carrier and unwanted sideband suppression. The T-4X SSB signal is a little "dirty" by today's standards. 73, Garey - K4OAH Atlanta Drake R-4C Service Information CD http://hr99.home.mindspring.com/R-4C_Servicez/ DW Holtman wrote: > Hello, > > There has been quite a lot of information lately comparing the Drake > R-4C with the R-4B. Could someone please compare the performance > differences between the R-4 and the R-4A to the R-4B? > > Thank you in advance. > > 73's > DW Holtman > WB7SSN ---------------------------------------------------------------------- On Behalf of Garey Barrell <[EMAIL PROTECTED]> Submissions: drakelist@www.zerobeat.net Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ ---------------------------------------------------------------------- _________________________________________________________________________________________________________________ Questo messaggio è da intendersi esclusivamente ad uso del destinatario e può contenere informazioni che sono di natura privilegiata, confidenziale o non divulgabile secondo le leggi vigenti. 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