[Drakelist] DRAKE PTO test procedure by Bill Frost
You can find the picture of the DRAKE PTO TESTER on the RL DRAKE Virtual Museum at http://www.dproducts.be/drake_museum/pto_test-fixture.htm Hereafte the comments of Bill Frost about the test of PTO: TEST and calibration of each PTO assembly, prior to installation in a product. The fixture was originally built for PTO’s going into the 4-line products and for the TR-4 transceiver. It was modified through out the years to coincide with the current production models, as well as older units serviced by the Service Department. The four position switch in the lower left corner allowed the selection of the product destined by the PTO being tested. The toggle switch in the lower left corner allowed the operator to select his/her task, dial calibration or tracking. The audio could be switched on or off with a toggle switch, left of the speaker grille. The center section measured the audio frequency, the left hand control adjusted the audio gain and the right hand switch provided an expanded scale if needed. However, the 0-2000 scale was the primary scale. The top section measured the RF output and the zener voltage of the PTO under test. An R-4 receiver was used as a monitor receiver, it was rarely, if ever turned off. The PTO’s were basically all the same, with exception to the tracking and dial accuracy. The 4-line permitted a 1 kHz error between each 100 kHz point, however the total error end to end could only be 3 kHz. The RF output was to be between .4 and .6 volts. In addition there was to be at least 55 kHz travel between each end and the stop pin. The 4-line PTO’s that didn’t quite make the calibration error were tagged for the SW-4A receiver. The TR-4 transceiver PTO was permitted to have 1 ½ kHz error at the first and last 100 kHz point, 1 kHz error in the middle and a total end to end error of 3 kHz. The RF output was also to be higher, .4 to .7 volts. The end travel was 7 kHz before hitting the stop pin. The TR-4 PTO’s with the highest RF output were tagged for the RV-4, as the additional output was neede d to make up for any loss in the inter-connecting cable to the TR-4. The TR-6 used the same PTO as the TR-4, with a different dial. The C-line PTO had the same specifications as the older 4-line PTO. The dials were changed to a dual dial configuration with 5 gears, all plastic. The dial mounting technique and gears were changed several times in an effort to reduce the problems caused by inconsistency of the plastic gears. Resulting in dial drag, backlash, and improper gear mesh. Some of the gears were changed to anti-backlash metal gears at some point during production of the TR-4CW transceiver. Spring-loaded gears were also used, as well as the same spring-loaded gears without the springs. Early into the production of the TR-7 transceiver the metal gears were abandoned completely and plastic gears were once again used. The calibration error of the 7-line was the same as that of the 4-line PTO. The 10 volt zener diode was omitted in the 7-line PTO and the RF output was .18 to .25 volts. The tuning fork was changed to a single prong and grounded with a small piece of ground braid to the PTO frame. The PTO Assembly Procedure read as follows: 1. Due to hysteresis characteristics of components, the complete PC board and components should be submitted to the temperature box at +50 degrees C for at least 4 hours before assembling coil. 2.The coils should be wound as tight as possible (tension tight enough that about 1 in 20 breaks the wire). 3. After winding the coils they should be submitted to the temperature box at +60 degrees C for at least 4 hours. 4. Brush a thin coating of Humiseal on the finished coil while still warm. 5. Let the Humiseal air dry (12 hours) on the coils before testing. 6. Track the PTO over its frequency range by adding appropriate tracking capacitor and test for temperature compensation. 7. Place PTO in drift box at room temperature and adjust frequency for a 1500 Hz beat against monitor receiver. 8. Turn on the drift box heaters and blowers allowing the internal temperature to come up to + 50 degrees C. 9. Leave in temperature box at elevated temperature for one hour and recheck frequency beat note. 10. Determine drift by noting error from original 1500 Hz beat note. 11. If error exceeds 500 Hz, change temperature-compensating capacitor and repeat steps after 6. 12. If error is less than 500 Hz, install appropriate dial and calibrate. Needless to say, there were always several PTO’s in the various stages of assembly and testing to keep the production lines going. Bill Frost R. L. Drake Co. Service Manage (c)2000 - R.L. DRAKE VIRTUAL MUSEUM www.dproducts.be/drake_Museum I hope it help you Kind regards, JM CHERRY http://www.dproducts.be/drake_museum/pto_test-fixture.htm ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net
RE: [drakelist] TUBE 6ea8 substitution TR4-c
Hey all, EA8 are still available at www.tubesandmore.com 73 , Jean-Marie www.dproducts.be/drake_museum De : [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] De la part de Radio Vintage Envoyé : mardi 14 novembre 2006 12:49 À : drakelist@www.zerobeat.net Objet : [drakelist] TUBE 6ea8 substitution TR4-c Which tube in place of the 6EA8 in the TR4-c , The 6u8 is Ok. the references of the pin are identical Tnx Frank __ Do You Yahoo!? Poco spazio e tanto spam? Yahoo! Mail ti protegge dallo spam e ti da tanto spazio gratuito per i tuoi file e i messaggi http://mail.yahoo.it
RE: [drakelist] T4X mic wiring question
"JM" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- For the wiring, take a look at http://www.dproducts.be/drake%5FMuseum/729srd.htm 73's, Jean-Marie CHERRY -Message d'origine- De : [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] De la part de Ken Simpson, W8EK Envoyé : dimanche 11 juin 2006 21:44 À : [EMAIL PROTECTED] Cc : Drake1 Objet : RE: [drakelist] T4X mic wiring question "Ken Simpson, W8EK" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Do you have the ground braid to the ground of the plug? The "Hot" of the audio goes to the sleeve of the plug, and the "hot" of the PTT goes to the tip. The "cold" of the PTT also connects to the ground of the plug, along with the shield. Sorry, but I do not remember for sure what color wire is what. My MEMORY says that red is PTT hot (tip), white is audio hot (sleeve), and black and braid go to ground. But this is memory, and might not be correct as to the colors. It is wired this way whether for PTT or VOX. 73, Ken, W8EK -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Sunday, June 11, 2006 11:46 AM To: drakelist@www.zerobeat.net Subject: [drakelist] T4X mic wiring question [EMAIL PROTECTED] made an utterance to the drakelist gang --- As usual, wiring for mic for my T4X is a mystery for me, I think I have the PTT part wrong maybe. First, I have another mic, a Turner, wired up OK, I use it strictly PTT, not VOX and it works fine. I recently got another mic from Ken, W8EK > > > > Drake "banana" desk microphone > > > > This is the 2 piece desk microphone that was used on the > > > > TR-3 and TR-4 and the 4 line twins. It has a separate stand, and > > > > can be lifted out of the stand, or left in it. These micro- > > > > phones are high impedance, and were made by ElectroVoice for > > > > Drake. This one is labeled EV 729 SR D on the microphone portion, > > > > while the base is an EV 417. My scope shows it does have good output, better than my Turner (with built-in amp) actually. Having trouble making the wiring happy. T4X manual sez: "connections to plug are: tip - push to talk switch, sleeve is microphone, body is common for both". When it says "sleeve", I'm assuming that's the part wired between the tip and the back / ground part of the plug (in the middle of the plug) ? The cable for the mic I got from Ken has white, red, black, and braid. I had thought tip would be white, red would be body / back, black would be middle / "sleeve". Not behaving correctly however. How should I have it ? I seem to remember something about making a choice between VOX and PTT. Is there some way to be able to do either ? If I have to, I guess my preference is PTT. I also seem to remember that with one of the setups, when I go back to CW I have to screw around with the VOX gain or something... Thanks, Chuck, K1OM drakelist@www.zerobeat.net -- Submissions:drakelist@www.zerobeat.net 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:drakelist@www.zerobeat.net 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 --
RE: [drakelist] AC-4 120-240V switch
Hi, Take a look on http://www.dproducts.be/drake%5FMuseum/ac-4_ps.htm 73’s, JM CHERRY De : [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] De la part de [EMAIL PROTECTED] Envoyé : jeudi 25 mai 2006 22:18 À : [EMAIL PROTECTED] Cc : drakelist@www.zerobeat.net Objet : Re: [drakelist] AC-4 120-240V switch << Hi John, I thought ALL the later model AC-4's were duel voltage units only requiring an internal wiring change. Mine is SN 55719. >> The latest serial number I have is 58298 and it is a single voltage supply. There are no cououts that don't have a factory connector mounted in them. It doesn't make sense to me that Drake would put a dual primary transformer in the power supply and hot have a way to switch it from the factory. Are you sure that the cutout is for that swith? Is it screened on the supply? It might be possible that someone removed the infamous 2 pin relay connector which would leave a cutout the same size as the switch. Check your schematic against the primary of the trasformer. If there are 2 sets of primary leads, then you have a dual voltage tranny, if there is only one set, it is a 120V power supply. 73, John
RE: [drakelist] 4LF
"JM" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- You will see hereafter the picture, schematic and infos about the 4-LF http://www.dproducts.be/drake%5FMuseum/4-lf_convertor.htm 73, JM CHERRY -Message d'origine- De : [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] De la part de Eugene Balinski Envoyé : vendredi 17 juin 2005 20:23 À : Don and Diana Cunningham; sebdesn; DRAKELIST Objet : Re: [drakelist] 4LF "Eugene Balinski" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Don, It is a Low Frequency converter. It converts the BCB to 10 m It is use to allow the B or C line receivers to cover 500 kHz to 2000 (?) kHz - the exact numnbers escape me now. They are relatively rare as I do not believe that the were made in huge numbers. 73 Gene K1NR Here is a link to the circiut description: http://www.dproducts.be/DRAKE_MUSEUM/4-lf_convertor.htm On Fri, 17 Jun 2005 08:03:47 -0500 "Don and Diana Cunningham" <[EMAIL PROTECTED]> wrote: > What is a "4LF" anyway?? Have had lots of 4 Line twins, > but never heard of that one. > Tks, > Don, WB5HAK - Web mail provided by NuNet, Inc. The Premier National provider. http://www.nni.com/ -- On Behalf of "Eugene Balinski" <[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 "JM" <[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/ --
[drakelist] Picture of HS-1 Headphone for the Drake_Museum
Hi Gang, I am looking since several year for a picture of the Drake HS-1 Headphone ! Can you help me ? This is for the Drake_Museum Pages. Thank you ! Jean-Marie CHERRYWebmaster http://www.dproducts.be/Drake_Museum
[drakelist] 19" DRAKE RECEIVERS FS
Hey gang, I have for sale with original service manuals the following receivers in very good cosmetic and working condition I will sale the receive in one shoot, preferably to a European. All is in very good condition. Pictures are available for serious collector. All is visible in Brussels-Belgium. Call first +32 475 411 311 ( GMT+1 time please ) RR-1 receiver full crystal 1.250 Euros ( with NB ) RR-2 receiver 2.500 Euros RR-3 receiver 3.000 Euros MSR-2 receiver 3.500 Euros = TOTAL 10.250 EUROS or better, more shipment = A UNIQUE OPPORTUNITY FOR YOU TO BUY those famous and very difficult to find marine and commercial receivers. Payment accepted, Visa, Mastercard. 73's, JM CHERRY www.dproducts.be/drake_museum
[drakelist] Help on this itel
Hey Gang, Does anybody know the Drake « BP7 PRE SELECTOR » ? Photo available at http://www.dproducts.be/drake_museum/
[drakelist] TR-7 Service manual
"JM" <[EMAIL PROTECTED]> made an utterence to the drakelist gang -- Hey Gang, I have ORIGINAL TR-7 service manuals (3 items). For sale 250.00 â each + shipment Contact me by mail [EMAIL PROTECTED] 73, Jammy -- On Behalf of "JM" <[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/ --
[drakelist] FOR SALE DRAKE COMMERCIAL & MARICE RECEIVERS
"JM" <[EMAIL PROTECTED]> made an utterence to the drakelist gang -- Hey gang, I have for sale with original service manuals the following receivers in very good cosmetic and working condition I will sale the receive in one shoot, preferably to a European RR-1 receiver full crystal 1.250 Ruros RR-2 receiver 2.500 Euros RR-3 receiver 3.000 Euros MSR-2 receiver (totally realigned) 3.500 Euros R-4245 receiver ( the top ! ) 4.000 Euros = TOTAL 14.250 EUROS or better, more shipment = A UNIQUE OPPORTUNITY FOR YOU TO BUY those famous and very difficult to find marine receivers. Payment accepted, Visa, Mastercard. 73's, JM CHERRY www.dproducts.be/drake_museum -- On Behalf of "JM" <[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/ --
