AW: [drakelist] Drake Differences
Graf Ulrich Com MD PD ST 2 ULM 1 <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Hello Maurizio, I once owned a TR-4C and operated it for many years. With an appropriate microphone and careful level adjustment I never got any critical audio reports. So the signal must have been rather clean. 73 Uli, DK4SX -Ursprüngliche Nachricht- Von: Bollini, Maurizio [mailto:[EMAIL PROTECTED] Gesendet: Mittwoch, 8. Juni 2005 13:15 An: Graf Ulrich Com MD PD ST 2 ULM 1 Betreff: RE: [drakelist] Drake Differences Thanks Uli for your answer. I guess that in TR-any it could be due to the balanced modulator, at first. I'm still interested to know if TR-any performs similar to T4X in term of "dirtyness" of the transmitted signal. 73 Maurizio, IZ2CED -Original Message- From: Graf Ulrich Com MD PD ST 2 ULM 1 [mailto:[EMAIL PROTECTED] Sent: mercoledì 8 giugno 2005 12.05 To: Bollini, Maurizio; Drakelist Mail (drakelist@www.zerobeat.net) Subject: AW: [drakelist] Drake Differences "Dirty" ssb signals have nothing to do with rf harmonics. They are caused by audio harmonics and inband intermodulation in af and rf stages. Both are created by overload of mic amp, balanced modulator and rf amplifiers. 73 Uli, DK4SX -Ursprüngliche Nachricht- Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Im Auftrag von Bollini, Maurizio Gesendet: Mittwoch, 8. Juni 2005 09:38 An: drakelist@www.zerobeat.net Betreff: FW: [drakelist] Drake Differences "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. Se il
Re: [drakelist] Question on how to fireup a brand-new AC-3 never powered up last 40 years. - reforming Electros....
They don't make capacitance meters like that anymore, do they? That sounds like a good technique. 73, Eric KA8FAN Rodney Bunt <[EMAIL PROTECTED]> wrote: Rodney Bunt <[EMAIL PROTECTED]>made an utterance to the drakelist gang--If you have a variac (Variable AC transformer) power up the PS, 10 volts at a time, over at leasta 24 hour period.An alternative is to disconnect the electros (and assuming they are in good condition in the firstinstance) using a capacitance tester, which is a high voltage power supply with a magic eye tubemonitoring the leakage current. Look at the Magic eye tube and when there is no leakage the edgesof the bright band are very well defined, when leakage is occuring the edges get less defined andpositivly blurry.Wind up the voltage untill the edges become slightly blurry, after a period of time the edges willbecome sharp, then wind up the voltage some more, untill the edge is blurre! d again, wait some moreuntill sharp, etc. etc. etc. In this way I have "reformed" some electrolityic capacitors from the1940's in a Hammarlund rig. THey are operating fine NOW.Here is a picure of the tester I use. http://www.qsl.net/la5ki/big/hc1.jpgRodneyVK2KTZ--- "Bollini, Maurizio" <[EMAIL PROTECTED]>wrote:> > "Bollini, Maurizio" <[EMAIL PROTECTED]>made an utterance to the drakelist gang> --> Good morning again,> > I have an AC-3 in these conditions: brand new, never powered up last 40> years.> > What do you suggest to do before beginning the fireup procedure ?> Do you suggest some components replacing? Which ones?> > Then, how to do a proper fireup?> > Thanks to share your experiences.> > 73 Maurizio, IZ2CED.> >_> Questo messaggio e da intendersi esclusivamente ad uso del destinatario e puo contenere> informazioni che sono di natura privilegiata, confidenziale> o non divulgabile secondo le leggi vigenti. Se il lettore del presente messaggio non e il> destinatario designato, o il dipendente/agente responsabile> per la consegna del messaggio al destinatario designato, si informa che ogni disseminazione,> distribuzione o copiatura di questa comunicazione e > strettamente proibita anche ai sensi del decreto legislativo 196/03 . Se avete ricevuto questo> messaggio per errore, vi preghiamo di notificarcelo> immediatamente a mezzo e-mail di risposta e successivamente di procedere alla cancellazione di> questa e-mail e relativi allegati dal vostro sistema.>_> This message is intended only for the use of the addressee and may contain information that is> privileged, confidential and exempt from > disclosure under applicable law. If the reader of this message is not the intended recipient, or> the employee or agent responsible for delivering the > message to the intended recipient, you are hereby notified that any dissemination, distribution> or copying of this communication is strictly > prohibited. If you have received this e-mail in error, please notify us immediately by return> e-mail and delete this e-mail and all attachments from > your system.>_> > > --> On Behalf of "Bollini, Maurizio" <[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/> --> __Do You Yahoo!?Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com --On Behalf of Rodney Bunt <[EMAIL PROTECTED]>Submissions: drakelist@www.zerobeat.netUnsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in bodyHopelessly Lost: [EMAIL PROTECTED] - help in body of messageZerobeat Web Page: http://www.zerobeat.netBrought to you courtesy of TLCHost.net http://www.tlchost.net/-- Do you Yahoo!? Yahoo! Mail - You care about security. So do we.
Re: FW: [drakelist] Drake Differences
Ron Wagner <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- On Wed, 8 Jun 2005, Bollini, Maurizio wrote: 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? Maurizio, I am fairly sure that what Gary speaks of is the crystal filtering. Basically the older radios have a "wider" filter. Because the bandpass is not as narrow (fewer poles) the rejection of the unwanted sideband and carrier (even with balance there is always some) is not as "far down". So there is more unwanted sideband and carrier present then "current state of the art". As state of the art changed, so did the ability to produce a higher quality signal. In the case of Amateur SSB rigs, better filters with better ability to reduce carrier and unwanted sideband is one of the measures of signal quality. As for the TRany, I can say that the TR3 was "dirty" compared to my T4XB. So given that they too went through filter changes I would guess that they are similar. But my primary experience is with separates, so Gary may need to correct me. Keep in mind that "filter quality" changed over the years. So being "dirty" can be said about any older rig. I think that the IMD and output filtering stayed about the same on the lines. The FCC harmonic content rules have tightened, so the older rigs may not meet the new specs. Gary will have to comment on that. I would suggest that everyone run a tuner and a lowpass filter. A good tuner will help reduce harmonics getting to the antenna, and a Drake tuner sitting next to the Drake rigs looks good too :-) 73, Ron WD8SBB -- On Behalf of Ron Wagner <[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/ --
AW: [drakelist] Drake Differences
Graf Ulrich Com MD PD ST 2 ULM 1 <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- "Dirty" ssb signals have nothing to do with rf harmonics. They are caused by audio harmonics and inband intermodulation in af and rf stages. Both are created by overload of mic amp, balanced modulator and rf amplifiers. 73 Uli, DK4SX -Ursprüngliche Nachricht- Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Im Auftrag von Bollini, Maurizio Gesendet: Mittwoch, 8. Juni 2005 09:38 An: drakelist@www.zerobeat.net Betreff: FW: [drakelist] Drake Differences "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. Se il lettore del presente messaggio non è il destinatario designato, o il dipendente/agente responsabile per la consegna del messaggio al destinatario designato, si informa che ogni disseminazione, distribuzione o copiatura di questa comunicazione è strettamente proibita anche ai sensi del decreto legislativo 196/03 . Se avete ricevuto questo messaggio per errore, vi preghiamo di notificarcelo immediatamente a mezzo e-mail di risposta e successivamente di procedere alla cancellazione di questa e-mail e relativi allegati dal vostro sistema. _ This message is intended only for the use of the addressee and may contain information that is privileged, confidential and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, or the employee or agent
FW: [drakelist] Drake Differences
"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. Se il lettore del presente messaggio non è il destinatario designato, o il dipendente/agente responsabile per la consegna del messaggio al destinatario designato, si informa che ogni disseminazione, distribuzione o copiatura di questa comunicazione è strettamente proibita anche ai sensi del decreto legislativo 196/03 . Se avete ricevuto questo messaggio per errore, vi preghiamo di notificarcelo immediatamente a mezzo e-mail di risposta e successivamente di procedere alla cancellazione di questa e-mail e relativi allegati dal vostro sistema. _ This message is intended only for the use of the addressee and may contain information that is privileged, confidential and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, or the employee or agent responsible for delivering the message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this e-mail in error, please notify us immediately by return e-mail and delete this e-mail and all attachments from your system. _ -- On Behalf of "Bollini, Maurizio" <[EMAIL PROTECTED]> Submissions:drakelist@www.zerobeat.net Unsubscrib
Re: [drakelist] Using TR7 as IF for VHF/UHF
[EMAIL PROTECTED] made an utterance to the drakelist gang -- Hej Lars! I have never known this hi! I cannot recall seeing it in any of the manuals either. But it works! Tack se mucke, hej do. Dick/PA2W > > "Lars E. Pettersson" <[EMAIL PROTECTED]> made an utterance to the drakelist > gang > -- > Here is a version using only the Drake TR7 > > HF-ant > ! > --+-+ > ! > EXT RX ++ > !! > ! S1a/o-+ HF > EXT ANT +---o/!/o RX conv > ! !o-o/! > ! !VHF !o TX conv > Acc ! S1b/o ! > Pin8+---o/ ! > PA dis. ! o-+ (--+ + Relay voltage > !! RLY ( - > !V GND ( A 1N4004 > ! ! ! > +10T! +--+ > Acc !2.2K ! > pin1+---/\/\/--+ ! > ! ! / > + +-! 2N3904, 2N, etc > Drake TR7 ! \ >/ ! >\ V GND >10K / >\ >! >V GND > > S1 DPDT, shown in HF position (the other is VHF) > > 73 de Lars, sm6rpz > -- > Lars E. Pettersson <[EMAIL PROTECTED]> > http://www.sm6rpz.se/ > -- > On Behalf of "Lars E. Pettersson" <[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/ > -- > -- On Behalf of [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/ --
