Re: VTTC operation, questions

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Luc by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ludev-at-videotron.ca>

Hi Shad,

Check used book library or :

http://www.bookfinder-dot-com/

Try to find an old copy of "The radio amateurs handbook" near the
1952 edition ( 29th edition ) you have all the information you
could dream about vacuum tube transmitter and receivers in
different configuration you have the most clear and simple
explanation about tube operation not with a lot of math formulas
remember this book is made for radio amateur not for EE. I read a
lot of thing but this one is a most ( I understand every thing
;-)) ). On "www.bookfinder-dot-com" I saw a lot of copy of it many
are in the target years and around $20.00.

Here is the content of it

	Frontispiece 	2
	The Amateur's Code 

	Chapter 1 	Amateur Radio 	9
	Chapter' 2 	Electrical Laws and Circuits 	15
	Chapter 3 	Vacuum-Tube Principles 	52
	Chapter 4 	High-Frequency Communication 	70
	Chapter 5 	High-Frequency Receivers 	76
	Chapter 6 	High-Frequency Transmitters 	129
	Chapter 7 	Power Supplies 	208
	Chapter 8 	Keying and Break-In 	231
	Chapter 9 	Speech Amplifiers and Modulators 	240
	Chapter 10 	Amplitude Modulation 	266
	Chapter 11 	Frequency and Phase Modulation 	285
  Chapter 12 	Reduced-Carrier and Single-Sideband
		                  Transmitting Techniques  293
  Chapter 13	Transmission Lines  307
	Chapter 14 	Antennas 	331
	Chapter 15 	About V.H.F 	362
	Chapter 16 	V.H.F. Receivers 	366
	Chapter 17 	V.H.F. Transmitters 	389
	Chapter 18 	V.H.F. Antennas 	413
	Chapter 19 	U.H.F. and Microwave Communication 	422
	Chapter 20 	Mobile Equipment 	434
	Chapter 21 	Measuring Equipment 	458
	Chapter 22 	Assembling a Station 	491
	Chapter 23 	BCI and TVI 	497
	Chapter 24 	Construction Practices 	514
	Chapter 25 	Operating a Station 	522
	Chapter 26 	Miscellaneous Data 	537
	Chapter 27 	Vacuum-Tube Data 	V1

		Catalog Section
		Index

I hope I could help.

Cheers,

Luc Benard




Tesla list wrote:
> 
> Original poster: "sundog by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<sundog-at-timeship-dot-net>
> 
>     Hi All!
> 
>  Christmas is nearly upon us, with all the ritual last-minute shopping in
> overcrowded stores elbowing your way past the checkout lines in a useless
> attempt to find the shortest one.  Tip I learned last year, the shortest
> line is that way because everybody in it moved to a faster line ;)
> 
> Now, the serious stuff!
> 
>     I've been digging through vacuum tube information, and am seriously
> kicking around the idea of grid-modulating a VTTC.  Principle is identical
> to a SSTC, you feed bursts of RF to the primary.  The 833A is well-suited to
> this task, and works at full power up to 30mhz I believe, so it should work
> fine at the 400-someodd khz range.
>     The more I go through the schematics, the more sense they make (I'm no
> EE, and tube gear is still funky to me).  There are some problems for me to
> overcome, but with my tube-driven signal gen as a working example of a grid
> tuned circuit, I think I can do it.
> 
>   Steps to this project :
>  - Build a high-powered DC supply.  I'm acquiring the MWO's for this.  I
> want about 3kv -at-1A available on a full-wave rectifier with a good-sized
> resevoir cap.
> -  Build the small grid-tuned oscillator.  The signal gen is going to be a
> world of help here.
> 
>  I have the rest of the parts that I'll need (the push-pull VTTC primary,
> etc.)  I don't forsee this project being a fast or easy one, but it should
> be fun and educational.  Plus the 833's are "just a little more tolerant" of
> mistakes than a MOFSET ;)  Most non-disastrous flaws show up as decreased
> output and increased tube dissapation.  In all honesty, the driving system
> for the 833's will be the most challenging.  Eventually I want to modulate
> the preamp tubes with solid state gear for adjustable duty cycle and better
> modulation control.
> 
> A note to all MOT scroungers, the few days after christmas are some of the
> *BEST* days to find MWO's sitting on the curb.  A kind work and smile to the
> old owner is usually all that's needed to get permission to retrieve it from
> it's fate.  Curb-raiding is highly frowned upon where I live (guess how I
> know?)
> 
>          Comments, questions, and snide remarks welcome!
>                                                 Shad