Re: VTTC operation, questions

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

Original poster: "R Heidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>

on 12/07/01 11:41 AM, Tesla list at tesla-at-pupman-dot-com wrote:

> 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
> 
> 
> 
"SAMS" publications also is a good tube Tx source.
   Robert  H