[ARC5] [Milsurplus] Stinson’s DC to DC converters

[wctaylor at juno.com]

Surely if the Russians could make a solid state replacement for the BC348 dynamotor years ago, with today’s technology a great replacement can be built. Maybe Dave could make a small fortune building SS dynamotor replacements. I’d sure be interested for all of my stuff, especially my R105/ARR-15’s.

Bill
KD4LXC 

Sent from my iPhone

> On Mar 14, 2018, at 3:37 PM, Todd, KA1KAQ <ka1kaq at gmail.com> wrote:
> 
> Honestly Dave, the noises I'm hearing are no worse than I've heard
> over the years using commercial sets with built in, filtered power
> supplies. With all the sources of garbage RF these days from household
> items, I'm actually surprised it's as 'clean' as it is.
> 
> I'd be very happy with those results. Didn't the stock dynamotors
> themselves create a certain level of hash as well?
> 
> ~ Todd/KAQ
> 
>> On Tue, Mar 13, 2018 at 11:22 PM, David Stinson <arc5 at ix.netcom.com> wrote:
>> 
>> 
>> -----Original Message-----
>> From: Tom Bridgers
>> Subject: [ARC5] Stinson’s DC to DC converters
>> 
>> This is exciting stuff.  Hats off to David Stinson who puts new meaning into keeping those filaments lit.
>> 73’s
>> Tom. KE4RHH
>> ------------------------------
>> 
>> Tom, you and so many are ever kinder to me than I deserve.  This "design" if one can all it that, is still in the "tweaking" stage.  I just now discovered that, if I remove the antenna, I can hear some noise around 40 and above.  With the antenna on, I haven't found any around 30, 40 or 80 meters, it seems to be under the receiver's noise floor.
>> 
>> I tried making this one with fewer ferrites than the last one, thinking I may have "overdone" that one.  Here's the photos:
>> https://photos.app.goo.gl/uAXN9Jfw9oCXuQC03
>> https://photos.app.goo.gl/4LmZIDuMJVbIszXt2
>> 
>> I probably should have tuned everywhere before writing- not just around 80 meters.  With an antenna on, it's fine for my operating; I'm not going to try to do very-weak-signal work with WWII gear.  So the fiddling continues.  Probably will add more ferrites and see how that does.  Even if it stays at this weak level, CW and Phone are it's a fair trade for such a simple regulated B+ supply, IMHO.
>> 
>> Here is the High-Freq RAX with the supply I just built, tuning 7-10 Mc.  The nasty hash you hear on AM is *not* the converter; it's a bad line noise I need to run down.  The only place you can hear weak birdies is when I tune across about 8.5-9.5 MC (yes, the top end of the band isn't yet calibrated correctly).  Going to see if a bit more ferrite will kill this "leak" in my shielding.
>> https://photos.app.goo.gl/mnG1oGBY6ZKrqoJq1
>> 
>> Just for fun, here is a short video of all three.  The LF/MF is runn

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