Talk:Radio transmitter design

message: Whats with all the tubes? Roger 21:03, 4 June 2007 (UTC)
replies: text: High power transmitters (greater than, say, 10 kiloWatt) use tubes rather than transistors. Jaho (talk) 13:23, 20 December 2009 (UTC)
replies: text: True, but an article on radio transmitter design shouldn't be focused on what are now highly specialized devices. -Roger (talk) 01:27, 21 December 2009 (UTC)
replies: text: Tubes are mainly used only in HF and VHF transmitters in the higher power ranges 10 KW to 1000 Kw. Two of the three examples shown are obsolete, the third nearly so and the drawing for that one is very unconventional and hard to interpret.  There have been a number of advanced AM/SW tube transmitters that should replace these. And, yes, using tubes in examples of low level circuits is not optimum. They should be transistors. My expertise is in high power short wave (AM and digital modulation)and I hope to improve the information  or perhaps do a separate article on AM transmitter design.  Suggestions welcome.JNRSTANLEY (talk) 19:21, 18 April 2013 (UTC)
replies: text: What would be really cool and useful, from the point of view of giving an encyclopediac overview of the subject, is some kind of log-log plot of CW power on one axis and frequency on the other, with the regions marked for triode/tetrode tubes, bipolar transistors, FETs, travelling-wave tubes, magnetrons, IMPATT diodes, etc. and so on - it would give the reader a quick feeling for the current practices. --Wtshymanski (talk) 20:35, 18 April 2013 (UTC)
replies: text: Good idea, I will give that some thought, or why don't you work that up. I can comment on the use of tubes above 1.8 Mhz part.
JNRSTANLEY (talk) 12:30, 27 April 2013 (UTC)
thread_title:  Tubes 

message: At the present stage of development, semiconductors can be used in all stages, including high power output amplifiers. (Of course as parallel devices when necessary.) So I think this article (otherwise well balanced) should be reorganised to include the semiconductors. Nedim Ardoğa (talk) 12:00, 3 March 2010 (UTC)
replies: text: See my comments on the issue above. (Tubes) Yes, solid state devices in parallel are technically possible at all power levels, but economically not, so tubes will be used for a while more, even in new designs. JNRSTANLEY (talk) 19:21, 18 April 2013 (UTC)
thread_title:  Semiconductors 

message: I find the opening paragraph to be quite strange with its reference to the need for two tuned circuits in transmitters and receivers, and the citation from a book about Tesla. This may put some readers off on the whole article which actually does contain some useful information.  Unless someone shows up to defend that opening paragraph in a few days, I will probably redo it. JNRSTANLEY (talk) 21:47, 27 April 2013 (UTC)
replies: text: Please do.  The current version is silly.  There's some truth to the point that one can't make a good reciever with a single-tuned filter, but no such requirement in the transmitter, as far as I can tell.  Dicklyon (talk) 05:40, 28 April 2013 (UTC)
thread_title: Opening paragraph

message: This section is flagged as having too much detail.  I wonder if some of this material could be moved to the intermediate frequency article. A very brief summary of the subject would be left here with a link to that article.  Any suggestions? JNRSTANLEY (talk) 19:39, 3 June 2013 (UTC)
thread_title: Local oscillators and unwanted mixing products

message: This is a very disorganized article, and some of the sections read more like a collection of how-to articles.  There is no list of the component parts of a typical transmitter (as there is in Transmitter), there is no central breakdown of the different transmitter types, there is no list of the design specifications (freq, output power, modulation index, freq stability, spurious emissions) used to design transmitters.  Under "Linking the transmitter to the antenna" there is no discussion of the central importance of impedance matching and SWR, and the requirement for an antenna tuner.  There is also no mention of the important issue of high voltage safety: bleeder resistors and safety interlocks --ChetvornoTALK 15:47, 12 February 2014 (UTC)
replies: text: Hi, I didn't mean to criticize anyone.  I can see the article was in a really poor state when you began. Your additions seem really excellent; I certainly learned a lot.  Not many WP articles are written by a professional in the field.  Your description of modulators was really clear. and your comparison of the advantages of tubes and solid state;  little points, like the power supplies have to be turned on in correct order (from exciter to final amplifier?).  As you say, there's always a desire to keep what's useful.   BTW, an alternative to improving an article in place is to create a work page on your user page, copy it there, perform major surgery, then put it back.  I'm currently doing a rewrite of Negative resistance that way.  I hope you don't give up on this article; I think you are the ideal person to write it.  I don't know how much help I'd be here, I don't have any experience with transmitters, but if you'd like someone to bounce ideas off of contact me.  I'll watchlist this page. --ChetvornoTALK 16:04, 15 February 2014 (UTC)
thread_title:  Disorganized article