Re: [Drakelist] R-4C frequency
I have 2 R4-C's and which behave in much the same way. I believe the PTO generally is not exactly linear from one end of its range to the other. Regards JB From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] On Behalf Of Henry Foglesong Sent: Tuesday, 16 July 2013 3:10 AM To: drakelist@zerobeat.net Subject: [Drakelist] R-4C frequency I just recently obtained an R-4C, made some upgrades to it, and aligned it. It is working very well with one small issue: On all bands, if I set the frequency to the calibrator at the low end, at the high end the dial readout is high by one or more khz when set to the calibrator (depending on the band width). I assume the issue is with the pto, but since I have had little experience with the R-4C, I would like suggestions about the easiest way to correct the problem before I dig into anything. Note: I have checked the calibrator with other frequency standards, and it is on the money. Thanks, Hank ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] R4C BFO Leakage
Have you been able to remove the NB-4 and bypass it with the jumper plug as yet? I have experienced this problem and I have found the NB-4 to be the culprit. You may be embarking on a process to eliminate symptoms rather than fixing the problem. JB From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] On Behalf Of Bill Becky Sent: Thursday, 12 July 2012 9:21 AM To: drakelist@zerobeat.net Subject: [Drakelist] R4C BFO Leakage A few weeks back I wrote about PBT levels in SSB/AM modes. It would change S-Meter levels depending on adjustment of the PBT. I ruled out the 4NB board by removing it..no change. However when I removed the bottom cover almost 6 S-Units of PB feedthrough were reduced and performance was enhanced with less white noise. Interesting to know the interference is being conducted by the metal bottom cover to key area's of the bottom chassis. Next I will attempt adding metal shields to isolate internal RF from conducting to nearby by circuits that are prone. Best 73 Bill KB9IV ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] WANTED TO BUY
What is a Poser Supply a new suit or free drinks? I know I know Power Supply. JB From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] On Behalf Of w4...@aol.com Sent: Tuesday, 10 July 2012 12:50 PM To: drakera...@yahoogroups.com; drakelist@zerobeat.net Subject: [Drakelist] WANTED TO BUY Cover for PS-75 Poser Supply. Must be new or in absolute mint condition. Please contact me off list stating price and condition. 73 and thanks, John, W4AWM ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] R4C Questions
Is the NB-4 Noise Blanker installed? If so remove the NB from the R4-C and install the jumper socket and see if the effect remains. Chances are the NB is the issue and will need to be realigned and the NB gain reset. JB From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] On Behalf Of Bill Becky Sent: Monday, 2 July 2012 12:24 PM To: drakelist@zerobeat.net Subject: [Drakelist] R4C Questions Hi Group I recently obtained a Sherwood upgraded R4C (SN 22xxx), the only Sherwood upgrade it doesn't have is the 2K Upper Lower SSB filters. It performs very well but it has one oddity. When in SSB mode and the PBT is adjusted Upper Lower end of travel it varies the S-Meter from S6 middle center PBT to S1 either PBT endpoint. On CW using the 1.5Khz, 500Hz or 250Hz it works like it should or what I'm accustom to. I've corrected many small problems by treating grounds and filter sockets, tube sockets from the topsidebottom side next. It just seems like I'm getting allot of white noise or bleed through from somewhere to cause the SSB mode oddity. Question? How can it tell if this has the T7C version xfrmer?? These Sherwood upgrades were done 20+ yrs ago and this nice condition R4C has sat unused for many years. Perhaps all is typical as I don't have another to compare to. Best 73 Bill KB9IV ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Crystal
Whoops made a typo: should read 4644.999 Khz. crystal. John VK2IFT From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] On Behalf Of John Brown Sent: Tuesday, 5 June 2012 2:32 PM To: Drake List Subject: [Drakelist] Crystal Folks, I am in the process of restoring an R-4C and I am having difficulty getting the Carrier Oscillator stable. It seems to drift from about 400hz below 4645khz up to 450Hz above and anywhere in between over time. It really should stabilise quickly +/- 50Hz after turn on. The power supply to the oscillator is clean and stable. The oscillator is part of the mode switch assembly and would have to be removed to get to the electronics. So I guess the drift issue could be attributed to any of the components and /or the crystal. So before I commit to pulling this assembly apart I am wondering if there is a possible supplier for the 4654.999 crystal? I figure if I am going to do this I should at least have a replacement crystal in hand. Any ideas on a crystal source? Thanks John VK2IFT ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Crystal
Folks, I am in the process of restoring an R-4C and I am having difficulty getting the Carrier Oscillator stable. It seems to drift from about 400hz below 4645khz up to 450Hz above and anywhere in between over time. It really should stabilise quickly +/- 50Hz after turn on. The power supply to the oscillator is clean and stable. The oscillator is part of the mode switch assembly and would have to be removed to get to the electronics. So I guess the drift issue could be attributed to any of the components and /or the crystal. So before I commit to pulling this assembly apart I am wondering if there is a possible supplier for the 4654.999 crystal? I figure if I am going to do this I should at least have a replacement crystal in hand. Any ideas on a crystal source? Thanks John VK2IFT ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] R4B AF GAIN
It's the same on both of my R-4C radios seems to be an unintended feature. JB From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] On Behalf Of Peter Ravn Sent: Thursday, 5 April 2012 1:52 AM To: Drakelist@zerobeat.net Subject: [Drakelist] R4B AF GAIN When the AF gain control on my R4B is turned fully CCW, the receiver is not completely quiet. Is this an anomality or a characteristic feature with the R4B? Thanks in advance. OZ8CTH Peter ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] R4C Sherwood mods
Max, if you are inclined towards doing all of the R-4C Sherwood mods on your receiver then I would say it would be well worthwhile. The complete mods really puts the R4-C ahead of the pack. I have done 2 R4C's this way and wouldn't hesitate to do them again. In terms of individual mods, then the power supply is a must and perhaps the filter capacitors at the same time. The audio module gets rid of the class A audio amp which is a heat generator and source of PTO drift. I believe you would need to do the audio mod if the power supply is upgraded. So once you start you might as well keep going. Best of luck JB From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] On Behalf Of AirRadio Sent: Saturday, 31 December 2011 8:28 AM To: drakelist@zerobeat.net Subject: [Drakelist] R4C Sherwood mods I am thinking about doing the full works Sherwood mods on my R4-C. Which are the best to do? I don't mind how far I go with this, I just want the best receiver for my money, I would like it for Top band use but I know it will be good for all frequencies however 160M is where I want to go. 73 Max M0GHQ/W8BX ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] strange relay setup for T4X
No mention of Vox but I can't see how there would be any if the relay is picked via a 12volt mod via the Mic PTT. If the rig is generally working OK (SSB) then I guess it's up to Dale as to the next move. If it was my issue then I would source an appropriate relay and restore the rig to its as built functionality. Best regards JB -Original Message- From: Garey Barrell [mailto:k4...@mindspring.com] Sent: Thursday, 29 December 2011 2:37 AM To: John Brown Cc: y...@aol.com; drakelist@zerobeat.net Subject: Re: [Drakelist] strange relay setup for T4X Possibly. Dale didn't mention whether the VOX worked or not. It wouldn't be that difficult to put a fet (2N7000?) in place of the last 6EV7 section to retain VOX. If the VOX (Semi-Breakin) doesn't work then the 'dit chop' doesn't matter! Of course the transmitter is much less pleasant to operate, at least to me.:-) -- 73, Garey - K4OAH St Charles, IL Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com John Brown wrote: I guess there will not be any VOX capability if it is hard wired to the PTT. JB *From:*drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] *On Behalf Of *y...@aol.com *Sent:* Wednesday, 28 December 2011 12:15 PM *To:* drakelist@zerobeat.net *Subject:* [Drakelist] strange relay setup for T4X Put the T4X on the bench today, noticed the relay had been changed out. I found a sealed relay in place of the open frame relay. The relay was for 12 vdc.. they powered the relay via a small rectifier and a small filter network,taken from the 12 volt ac feed to the rig from the AC-4. The Ptt circuit is now 12 vdc at the mic jack. I tried to follow what was changed in the PTT wiring really hard to follow as they wove the new wire into the old harness. I set the rig up with the ac-4, and checked it out. Everything seems to work as it should, T4X had no trouble tuning to full output. I guess the question is , this mod seems to work fine ,as its done ,is there any thing I should be concerned about using the mod , as to the way the T4X was originally set up? any one see any pitfalls ? thanks dale wt4t ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] strange relay setup for T4X
I guess there will not be any VOX capability if it is hard wired to the PTT. JB From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] On Behalf Of y...@aol.com Sent: Wednesday, 28 December 2011 12:15 PM To: drakelist@zerobeat.net Subject: [Drakelist] strange relay setup for T4X Put the T4X on the bench today, noticed the relay had been changed out. I found a sealed relay in place of the open frame relay. The relay was for 12 vdc.. they powered the relay via a small rectifier and a small filter network,taken from the 12 volt ac feed to the rig from the AC-4. The Ptt circuit is now 12 vdc at the mic jack. I tried to follow what was changed in the PTT wiring really hard to follow as they wove the new wire into the old harness. I set the rig up with the ac-4, and checked it out. Everything seems to work as it should, T4X had no trouble tuning to full output. I guess the question is , this mod seems to work fine ,as its done ,is there any thing I should be concerned about using the mod , as to the way the T4X was originally set up? any one see any pitfalls ? thanks dale wt4t ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Nastiest Drake Gear
NahI think it will come up pretty well. JB -Original Message- From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] On Behalf Of Steve Wedge Sent: Wednesday, 21 December 2011 11:46 PM To: drakelist@zerobeat.net Subject: [Drakelist] Nastiest Drake Gear I'm going to nominate this as the most-abused, nastiest-looking piece of Drake gear I've ever seen: http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItemitem=260919992177ssPageNa me=ADME:B:SS:US:1123 I wouldn't even bet that the meter's working given how much moisture this one has seen. Enjoy those Drakes - but not underwater... Steve, W1ES/4 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] R-4B low sensitivity low output on 10 meters 28 MHZ
Probably the inj level is higher from the T4X. Might need to investigate the R4B mixers. JB From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] On Behalf Of J G Sent: Thursday, 10 November 2011 9:29 AM To: drakelist@zerobeat.net Subject: [Drakelist] R-4B low sensitivity low output on 10 meters 28 MHZ Hi, Now that 10 is alive and well, I decided to put the B line (T-4XB, R-4B) on 10. Hasn't been there in a long time. The low sensitivity part: The R-4B has low sensitivity on 10. I do not recall that from 20 some years ago when I was last on 10 with it. Using the R-4B to control, the calibrator will get an S meter reading of about S5. Using the T-4XB to control the calibrator will yield an S8 reading. This was done at 28.5, and this is after adjusting the 4 trimmers for 28.0. I notice the same results using the cw range (28.0 - 28.5) crystal at both 28.0 and at 28.5. I do have 28.0 and 28.5 crystals in both the R-4B and the T-4XB. A low S meter reading is also obtained using the 24.5 meg crystal that I have in an accessory socket of the R-4B (I do not have one for the T-4XB). As expected, real signals are louder using the T-4XB to control. This situation did exist on 15 meters, but adjusting the 21 trimmers did take care of that. The low output part: Using the R-4B to control, power out is low. About the best it can do is 30 watts with .16 plate current. Using the T-4XB to control (transceive), about 75 watts with .26 plate current (gain full open) Using the SEPARATE position about 110 watts with .32 plate current (gain at a bit less than 12:00) Power readings as per wattmeter in C-4, so may not be accurate, but they are relative. I think the low sensitivity and low output problems are related, but I am not sure why the output would vary so much between the T-4XB as the transceive control and the separate control. Any ideas welcomed. Thank you, Jim ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Scammer
I advertised for a T-4XC front panel on the Australian VKHam classified website and immediately received an Email response from somebody supposedly located at: 46 medomak mobile home park waldoboro,me 04572 offering either the T-4XC or just the front panel, claiming he has tried to sell the transmitter but hasn't as yet and would just sell the panel. Seems very odd indeed. I am aware there are some scammers responding to Hams placing wanted ads on online classified sites claiming to have exactly what was advertised. Anybody have any insight into this activity in the USA , or is this address familiar, or am I being a bit too cautious? Regards John ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Re Diversity Reception
Probably need two antennas, two receivers and a multiplexer that can switch between either receiver as the signal on each antenna fades in and out. It was called Diversity Reception and was used for commercial RRTY (among others uses)in order to maintain a constant signal feed to the RTTY machines. The 2 antennas that were typically used were 4 acre Rhombics or similar, so they were spread out over a relatively broad area of land able to react to the ionospheric changes causing the fading. Don't see how you can do it with just two antennas without having them reasonably separated and some way of detecting the change in signal strength to select the appropriate antenna. Interesting thought however JB ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Re GUF filter
I used the Irad 6Khz 1st IF. Works well. JB VK2IFT ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Re Rob Sherwood
Gents, my thanks again to all who replied with advice regarding Rob. I eventually made contact and it appears his business Email has a SPAM filter that for some reasons rejects certain emails. mostly mine darn it. Again many thanks and most appreciated. Best regards to all John VK2IFT ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Re Sherwood Engineering
I have been trying to contact via Email Rob Sherwood of Sherwood Engineering over the past couple of months to place an order with his company to no avail. I wonder if any members of the list have any info re Rob and his wellbeing and if he is still trading? The Sherwood Engineering website is still active. Thanks regards to all. John Brown ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
