We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissable in your locale.

Author Topic: So...what can a person do with 2 or 4: WL23791/TH150  (Read 9847 times)

Offline RedMercuryLabs

  • Jr. Member
  • **
  • Posts: 82
  • Earth
    • Yahoo Instant Messenger - redmercurylabs
    • View Profile
    • Red Mercury Labs
Re: So...what can a person do with 2 or 4: WL23791/TH150
« Reply #15 on: December 24, 2013, 1746 UTC »
Vince --  That was where I was leaning.  Something this beautiful and powerful deserves nothing more than amplitude modulation.

Poll pigs are available surplus...and would make a perfect reserve anchor.  With the protruding electrodes, it would even dig into the mud.

I'm trying to find a good homebrew or even commercial schematic.  I would hate to power this up, and have it launch off the deck :)  Fireworks are fun, but this little baby probably has a ton of smoke to let out.

« Last Edit: December 25, 2013, 2330 UTC by RedMercuryLabs »
On a clear blue sea...
Yoshi 5000 Transmitter
Doublet hanging from the yardarm
Saxton 8322  RG 223/U  Feed
RV Red Mercury
"I don't post much, but when I do, I prefer HFU"

Offline ka1iic

  • Hero Member
  • *****
  • Posts: 900
  • Troy, Ohio
  • Troy, Ohio. 20m Vertical & low long wire E/W,
    • View Profile
    • Email
Re: So...what can a person do with 2 or 4: WL23791/TH150
« Reply #16 on: January 17, 2014, 2041 UTC »
Wellllll....  diagram ehhhh????

Check out Gates transmitters...  RMI also comes to mind but in the mean time check out the diagrams here:

http://bama.edebris.com/manuals/

What would be great would to have the mod tranny AND the matching mod reactor to go with it...  serious power calls for serious components... ;-)

Have fun... :-)

73
Vince KA1IIC
73 Vince
KA1IIC

"If you can't be anything, you can at least be annoying"

Troy, Ohio. 20m Vertical & low long wire E/W, Yaesu FT-187ND, SDRplay 2, Ratt Shack 2 meter rig, and other little bits of electronics I'm not talking about, homebrewed and otherwise... so there bleech!

Offline RedMercuryLabs

  • Jr. Member
  • **
  • Posts: 82
  • Earth
    • Yahoo Instant Messenger - redmercurylabs
    • View Profile
    • Red Mercury Labs
Re: So...what can a person do with 2 or 4: WL23791/TH150
« Reply #17 on: January 21, 2014, 0609 UTC »
 :P
On a clear blue sea...
Yoshi 5000 Transmitter
Doublet hanging from the yardarm
Saxton 8322  RG 223/U  Feed
RV Red Mercury
"I don't post much, but when I do, I prefer HFU"

Offline redhat

  • DX Legend
  • ******
  • Posts: 1218
  • USA
  • Music is my drug.
    • View Profile
    • Email
Re: So...what can a person do with 2 or 4: WL23791/TH150
« Reply #18 on: January 21, 2014, 1247 UTC »
Finding a modulation transformer at that power level won't be easy.  I've contemplated similar arrangements with big tetrodes for carrier levels over 10KW, but for the previously mentioned difficulty, decided the best route would be a linear amplifier, rather than high level modulation.

+-RH
Somewhere under the stars...
WinRadio Excalibur/305 w/ a chi-town resonant loop, Kenwood KDC-U356 for mobile listening.
Please send QSL's and reception reports to xfmshortwave [at] gmail [d0t] com

Offline ka1iic

  • Hero Member
  • *****
  • Posts: 900
  • Troy, Ohio
  • Troy, Ohio. 20m Vertical & low long wire E/W,
    • View Profile
    • Email
Re: So...what can a person do with 2 or 4: WL23791/TH150
« Reply #19 on: January 21, 2014, 1924 UTC »
Yep mod iron can be a MAJOR problem... but never fear... series modulation can and does work :-)  quite effectively too...  Just an idea from this 'old fart' heh

73
Vince
KA1IIC
73 Vince
KA1IIC

"If you can't be anything, you can at least be annoying"

Troy, Ohio. 20m Vertical & low long wire E/W, Yaesu FT-187ND, SDRplay 2, Ratt Shack 2 meter rig, and other little bits of electronics I'm not talking about, homebrewed and otherwise... so there bleech!

Offline redhat

  • DX Legend
  • ******
  • Posts: 1218
  • USA
  • Music is my drug.
    • View Profile
    • Email
Re: So...what can a person do with 2 or 4: WL23791/TH150
« Reply #20 on: January 22, 2014, 0911 UTC »
I'm not sure I would want to witness the initial startup of a series modulated 10KW AM rig.  Sounds like a fire department affair.

+-RH
Somewhere under the stars...
WinRadio Excalibur/305 w/ a chi-town resonant loop, Kenwood KDC-U356 for mobile listening.
Please send QSL's and reception reports to xfmshortwave [at] gmail [d0t] com

Offline ka1iic

  • Hero Member
  • *****
  • Posts: 900
  • Troy, Ohio
  • Troy, Ohio. 20m Vertical & low long wire E/W,
    • View Profile
    • Email
Re: So...what can a person do with 2 or 4: WL23791/TH150
« Reply #21 on: January 22, 2014, 2304 UTC »
errrr... I didn't say fire it up at 10kw <heh>  but that would be something like henry yell are might try... complete with clip leads heeeheee...

heh

73
vince
ka1iic
 
73 Vince
KA1IIC

"If you can't be anything, you can at least be annoying"

Troy, Ohio. 20m Vertical & low long wire E/W, Yaesu FT-187ND, SDRplay 2, Ratt Shack 2 meter rig, and other little bits of electronics I'm not talking about, homebrewed and otherwise... so there bleech!

Offline redhat

  • DX Legend
  • ******
  • Posts: 1218
  • USA
  • Music is my drug.
    • View Profile
    • Email
Re: So...what can a person do with 2 or 4: WL23791/TH150
« Reply #22 on: January 24, 2014, 0131 UTC »
My point was that, series modulation does work, best at low power levels because of the inefficiency involved.  If you were going to do high level PWM ala Harris's MW-5, et all, thats a different story.  High level PWM does work very well, and even today's solid state MW and SW transmitters under 6KW use this principle.  To my knowledge, the only domestic manufacturer of high level tube PWM transmitters is continental electronics.  They have a 50KW "Solid state modulator" which is essentially 48 750V power supplies individually series modulated with PWM and wired in series to get 10KV average B+ for the final tube.  The benefit; no modulator tubes, high efficiency, and lower operation costs.  The custom plate transformer which rolls on railroad track by the way, must be a pricy one.  Never mind the fiber optic drive system.

+-RH
Somewhere under the stars...
WinRadio Excalibur/305 w/ a chi-town resonant loop, Kenwood KDC-U356 for mobile listening.
Please send QSL's and reception reports to xfmshortwave [at] gmail [d0t] com

Offline ka1iic

  • Hero Member
  • *****
  • Posts: 900
  • Troy, Ohio
  • Troy, Ohio. 20m Vertical & low long wire E/W,
    • View Profile
    • Email
Re: So...what can a person do with 2 or 4: WL23791/TH150
« Reply #23 on: January 29, 2014, 1807 UTC »
very true Redhat :-)

If it were myself... I'd go with low level modulation and use the big tubes as a class B amp...  tune up would require a scope but that's no big deal... and a person can realize very decent audio quality using great care...

PWM is great, I've never done that but I have heard that keeping the pulse train out of the system needs a lot of filtering...  I'm way too lazy for that gig <heh>

73 Vince
ka1iic
73 Vince
KA1IIC

"If you can't be anything, you can at least be annoying"

Troy, Ohio. 20m Vertical & low long wire E/W, Yaesu FT-187ND, SDRplay 2, Ratt Shack 2 meter rig, and other little bits of electronics I'm not talking about, homebrewed and otherwise... so there bleech!

Offline Evodoc

  • Newbie
  • *
  • Posts: 2
    • View Profile
Re: So...what can a person do with 2 or 4: WL23791/TH150
« Reply #24 on: April 09, 2019, 1709 UTC »
I know this is a very old thread but does anyone know how to contact RedMercuryLabs to find out if he still has any of theses tubes?

Online flexoman61

  • DX Legend
  • ******
  • Posts: 2015
  • Connecticut, USA
    • View Profile
    • Email
Re: So...what can a person do with 2 or 4: WL23791/TH150
« Reply #25 on: April 09, 2019, 2145 UTC »
I know this is a very old thread but does anyone know how to contact RedMercuryLabs to find out if he still has any of theses tubes?

He has contact info under his icon.
Please QSL to: flexoman61@gmail.com
Connecticut
Icom R75/Kenwood R-2000
200' longwire/43m band folded dipole/VHF ground plane

Offline Evodoc

  • Newbie
  • *
  • Posts: 2
    • View Profile
Re: So...what can a person do with 2 or 4: WL23791/TH150
« Reply #26 on: April 09, 2019, 2358 UTC »
All those links are dead. He hasn't posted since 2014