Hello from London, UK

Transmitter Man · 4th August 2004, 09:49 PM

My name is Philip de Cadenet and I run an e-commerce company called Transmitters 'R' Us specialising in radio and TV broadcasting equipment. I am based opposite London's famous Harrods department store and back onto Hyde Park. Built my first crystal set age 9 in 1965, a few years ago! Radio's in my blood. Not much time for home brew electronics these days but am at present building a 350w class-E AM transmitter. Hope to make some friends here and will drop by from time to time.

dhaen · 4th August 2004, 10:12 PM

Welcome Phil

That's an interesting line of business. I'm not sure who we have here in the same line, but there must be some... maybe a slightly noisy Brazilian member.... after all s/n isn't a vital parameter on the tx side...

Hopefully your interests extend to audio

Enjoy the forums,

SY · 4th August 2004, 10:14 PM

What band is the AM transmitter slated for? I used to love 10 meter AM back in the day, but what a bandwidth hog it can be compared to SSB.

dhaen · 4th August 2004, 10:19 PM

SY, you never mentioned you were licensed (li****ed)..how do you spell it?

Transmitter Man · 5th August 2004, 07:23 AM

Hi John,

Regarding s/n, I think you would be amazed at the complex arcitecture involved in the design of todays AM broadcast transmitters. I recently added this statrement to my AM transmitter products page and it stands true: "There is no limitation to the fidelity of AM radio. From a mathematical standpoint, AM does better in frequency response than FM."
- Leonard Kahn
Unfortunitely for AM, there are several factors for the decline in AM broadcasting, especially of music, not least of which is the poor quality receivers that are manufacturered today.

Phil

Transmitter Man · 5th August 2004, 07:27 AM

Hi SY,

Bandwidth hog, surely not

On the amateur (ham) bands it's one of the few places there are no bandwidth restrictions. As you're in the US you should be able to easily hear the 80m AM home brew brigade, especially those with the cuirrent crop of class-E AM transmitters (no modulation transformers to saturate and only a handful of IRF's in the modulator modulating many hundreds of watts of RF.

Phil

SY · 5th August 2004, 12:38 PM

Quote:

you should be able to easily hear the 80m AM home brew brigade

You mean where all the heterodyning happens?

To show my age, the last AM transmitter I built had one of those old fashioned transformer-in-the-plate-feed modulators. Four 811As to modulate a pair of V70Ds.

Mosfets seem a bit more elegant!

4th August 2004, 09:49 PM	#1
Transmitter Man diyAudio Member Join Date: Aug 2004 Location: London	Hello from London, UK My name is Philip de Cadenet and I run an e-commerce company called Transmitters 'R' Us specialising in radio and TV broadcasting equipment. I am based opposite London's famous Harrods department store and back onto Hyde Park. Built my first crystal set age 9 in 1965, a few years ago! Radio's in my blood. Not much time for home brew electronics these days but am at present building a 350w class-E AM transmitter. Hope to make some friends here and will drop by from time to time.

4th August 2004, 10:14 PM	#3
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	What band is the AM transmitter slated for? I used to love 10 meter AM back in the day, but what a bandwidth hog it can be compared to SSB. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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4th August 2004, 10:12 PM	#2
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	Welcome Phil That's an interesting line of business. I'm not sure who we have here in the same line, but there must be some... maybe a slightly noisy Brazilian member.... after all s/n isn't a vital parameter on the tx side... Hopefully your interests extend to audio Enjoy the forums,

4th August 2004, 10:19 PM	#4
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	SY, you never mentioned you were licensed (li***ed)..how do you* spell it?

5th August 2004, 07:23 AM	#5
Transmitter Man diyAudio Member Join Date: Aug 2004 Location: London	Hi John, Regarding s/n, I think you would be amazed at the complex arcitecture involved in the design of todays AM broadcast transmitters. I recently added this statrement to my AM transmitter products page and it stands true: "There is no limitation to the fidelity of AM radio. From a mathematical standpoint, AM does better in frequency response than FM." - Leonard Kahn Unfortunitely for AM, there are several factors for the decline in AM broadcasting, especially of music, not least of which is the poor quality receivers that are manufacturered today. Phil

5th August 2004, 07:27 AM	#6
Transmitter Man diyAudio Member Join Date: Aug 2004 Location: London	Hi SY, Bandwidth hog, surely not On the amateur (ham) bands it's one of the few places there are no bandwidth restrictions. As you're in the US you should be able to easily hear the 80m AM home brew brigade, especially those with the cuirrent crop of class-E AM transmitters (no modulation transformers to saturate and only a handful of IRF's in the modulator modulating many hundreds of watts of RF. Phil

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