Re: [Drakelist] R-4A PTO: It wasn't the transistors (entirely)

Hi Jim: I didn't know Tri-Flo came as a grease also..nice. I do use a white teflon grease in the bike and radios but different brand. I have some stuff called WGL that I cme across on the boat. totally waterproof and is nearly a pure teflon in grease form. never dries up because it has

Re: [Drakelist] R-4A PTO: It wasn't the transistors (entirely)

Hi Curt, On Sat, 30 Jul 2011 10:12:39 -0400, Curt Nixon wrote: I didn't know Tri-Flo came as a grease also..nice. I do use a white teflon grease in the bike and radios but different brand. This is a clear grease - they say it can be found in the better bike shops, but I had to get my (now

Re: [Drakelist] R-4A PTO: Confirmed it's the PTO.

I know from my experience in the semiconductor business that zeners (especially those from a prior era) are notoriously noisy and can become outright unstable to varying degrees. You will not see this with a DVM or other averaging type instrument. You should put a scope on the zener and turn up

[Drakelist] Drake Sunday Schedule ?

Howdy, What time and frequency is the Drake Sunday schedule? Thanks, Michael Kelly N4MAK ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist

Re: [Drakelist] R-4A PTO: Confirmed it's the PTO.

Which is why subbing the Zener is the FIRST thing we check, after making sure the spring is in place!! :-) Is a three-terminal regulator such as a 78LO10 ? a better choice?? 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs

Re: [Drakelist] R-4A PTO: Confirmed it's the PTO.

The 78L10 is only 39-cents ea. in small quantities through Mouser. I had always assumed that a Zener with current limiting resistor or in the alternative, a Zener with pass transistor would produce a quieter output than a monolithic regulator? So, is it possible that a 78L10 may be more

Re: [Drakelist] R-4A PTO: Confirmed it's the PTO.

I'm interested in Dennis' response to this. Yes, it's a 'more complex' solution, but 'may' be quieter? I don't know if they are more 'stable' or not. I DO know that Zeners ARE noisy, reflected in their use as noise generators for many of the noise sources used for receiver and other testing.

[Drakelist] RV-75 For Sale

Is anyone interested in buying a Drake RV-75 for your TR7?? If you are also running the Drake R7 with your station and are interested in the RV75, please let me know as I might have another item of interest to you, hi. No fire sale, so don't expect it to be cheaper than I gave, but I don't

Re: [Drakelist] Drakes and temperature

That is certainly true that the rf impedance will be different and certainly a soldered connection between the frame and yoke doesn't hurt. I may even wind up doing this on my receiver once I find the bad component. I just don't think it's the problem with my PTO because there are some other

Re: [Drakelist] R-4A PTO: Confirmed it's the PTO.

- Original Message - From: Garey Barrell k4...@mindspring.com To: Paul Christensen w...@arrl.net Cc: drakelist@zerobeat.net Sent: Saturday, July 30, 2011 12:04 PM Subject: Re: [Drakelist] R-4A PTO: Confirmed it's the PTO. I'm interested in Dennis' response to this. Yes, it's a

[Drakelist] Grease

Hmmm... I bought some Shinetsu grease from a Honda dealer for the original purpose of lubricating the tracks of my windows in my '96 Miata and have a whole tube of the stuff. Wondering it it's similar as it's completely synthetic. I've been looking for applications for this stuff :) Steve

Re: [Drakelist] R-4A PTO: Confirmed it's the PTO.

Interesting point, Dennis. I also remember a noise bridge in the old ARRL handbook that used a zener as the noise source. So what did you use to regulate the voltage: LM340 or similar? Not a bad thought, actually... Steve Wedge, W1ES/4 I can't complain, but sometimes I still do. - Joe Walsh

Re: [Drakelist] Drakes and temperature

Steve - Have you swapped the Zener??? 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com Steve Wedge wrote: That is certainly true that the rf impedance will be different and certainly a soldered connection between the

Re: [Drakelist] R-4A PTO: Confirmed it's the PTO.

Yes, Garey, when zeners are run at current levels near their knee they do tend to be noisier. Applying this knowledge tends to give better results with a typical zener exhibiting white noise. But should a zener go unstable all bets are off. The 78L series voltage reg is zener based. Depending

Re: [Drakelist] R-4A PTO: Confirmed it's the PTO.

The RC on the output of the zener trick works for white noise, but I think the freq jumps would be just as annoying. Dennis AE6C On Sat, Jul 30, 2011 at 2:31 PM, Garey Barrell k4...@mindspring.com wrote: Dennis - Well, I know I want to know more! I've been out of semis so long I'm

Re: [Drakelist] Drakes and temperature

Steve Wedge wrote: That is certainly true that the rf impedance will be different and certainly a soldered connection between the frame and yoke doesn't hurt. I may even wind up doing this on my receiver once I find the bad component. I just don't think it's the problem with my PTO because

[Drakelist] Hc6u crystals

Quick question: Are 4 Line crystals hc6u? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist

Re: [Drakelist] R-4A PTO: Confirmed it's the PTO.

- Original Message - From: Dennis Monticelli dennis.montice...@gmail.com To: drakelist@zerobeat.net Sent: Saturday, July 30, 2011 2:51 PM Subject: Re: [Drakelist] R-4A PTO: Confirmed it's the PTO. The RC on the output of the zener trick works for white noise, but I think the freq