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Old 2nd Apr 2020, 10:13 pm   #1
trickie_dickie
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Default Top band transmitter

Does anyone remember Practical Wireless back in the early sixties. They had an article for a home brew 160 metres CW transmitter using a 6C4 oscillator, EF91 driver and an 807 PA into a Pi Tank. 10 watts, I think. Morse key in the cathode. I'm looking for a copy of the article for my History book.
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Old 2nd Apr 2020, 11:03 pm   #2
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Default Re: Top band transmitter

Electronic copies of Practical Wireless from 1932 to 1999 are available here:-

https://www.americanradiohistory.com...s_Magazine.htm

Had a quick look and only Top Band stuff was all AM (and only one using a 6C4) but it could be buried in there somewhere.
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Old 3rd Apr 2020, 12:28 am   #3
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Default Re: Top band transmitter

Given that an 807 in a 10W rig is a bit unusual, I think I would have remembered that in PW - but I don't, though my memory may be failing .

B
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Old 3rd Apr 2020, 7:57 am   #4
M0FYA Andy
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Default Re: Top band transmitter

I'll put money on it being by FG Rayer!
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Old 3rd Apr 2020, 8:52 am   #5
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Default Re: Top band transmitter

The short wave mag one used a 6L6, I seem to remember.

I think you'll just have to search those PWs on the American radio history site, but it might have been anytime in the 50s or 60s. Spare time is one of the few available commodities right now, and trawling through old magazines is very diverting....

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Old 3rd Apr 2020, 11:44 am   #6
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Default Re: Top band transmitter

I've had a look through my copies from late 59 to 68. There are several top band transmitter designs but none with that valve line up. There are several using the 6C4 but none with an 807.

I'll take a look at some earlier PWs later.

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Old 3rd Apr 2020, 12:30 pm   #7
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Default Re: Top band transmitter

I suppose radio constructor and the RSGB Bulletin could be other places to explore?
Rob
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Old 3rd Apr 2020, 1:04 pm   #8
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Default Re: Top band transmitter

Part of a PW article...Top Band Tx....807:

https://www.americanradiohistory.com...%22transmitter 807%22

I've not looked for any more yet.

EDIT: Not sure of the contents of the blueprint referred to in this article on page 708:

https://www.americanradiohistory.com...PW-1963-12.pdf

Lawrence.

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Old 3rd Apr 2020, 3:33 pm   #9
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Default Re: Top band transmitter

PW August 1971 has am/cw dual band tx 6c4, ef91, 6bw6.
Cover has 3 men in suits, shirts and ties with a metal detector on a beach.
I often thought how ridiculous that cover looked!
I agree David, you can soon get absorbed in looking back at old articles.
Rob
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Old 3rd Apr 2020, 4:36 pm   #10
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Default Re: Top band transmitter

There's some good stuff in that edition. The Transmitter is very similar to the one I
I built when i got my first HF amateur licence back in 1980.

Cheers

Aub
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Old 3rd Apr 2020, 5:41 pm   #11
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Default Re: Top band transmitter

When I was a "junior" in the TV shop in the 60's I too came across an article in PW..Two things stopped me making it... no 6V6 and no crystal... "im sure it was a 6V6 but hey.."L" and"V" no matter really
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Old 3rd Apr 2020, 10:14 pm   #12
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Default Re: Top band transmitter

My sister threw all my 60's PWs in to a skip when she cleared my late mother's house. Haven't seen her for ~25 years.

I've acquired a few copies since then, and always enjoy browsing through them.

B
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Old 4th Apr 2020, 12:39 am   #13
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Default Re: Top band transmitter

Quote:
Originally Posted by ms660 View Post
EDIT: Not sure of the contents of the blueprint referred to in this article on page 708:

https://www.americanradiohistory.com...PW-1963-12.pdf

Lawrence.
From part images of the blueprint I have found on the net, the output valve is a 5763 and only a 2 valve Tx in total, so not the one the OP describes.
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Old 4th Apr 2020, 1:30 am   #14
trickie_dickie
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Default Re: Top band transmitter

I'd like to thank you all for your help. I'm busy looking at the "AmericanRadioHistory site.
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Old 4th Apr 2020, 10:21 am   #15
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Default Re: Top band transmitter

We'll expect you back in a year or two.

David
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Old 4th Apr 2020, 12:56 pm   #16
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Default Re: Top band transmitter

Quote:
Originally Posted by M0FYA Andy View Post
I'll put money on it being by FG Rayer!
Hi OM Andy,

Who else other than G3OGR!

73,

Nandu.
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Old 4th Apr 2020, 1:02 pm   #17
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Default Re: Top band transmitter

Quote:
Originally Posted by trickie_dickie View Post
Does anyone remember Practical Wireless back in the early sixties. They had an article for a home brew 160 metres CW transmitter using a 6C4 oscillator, EF91 driver and an 807 PA into a Pi Tank. 10 watts, I think. Morse key in the cathode. I'm looking for a copy of the article for my History book.
Hi Richard,

Here are two (10W DC input - no 807).

First in The Short Wave Magazine

http://www.g4kfk.co.uk/Easy_Top_Band...SWM_197004.pdf

Second in Practical Wireless

https://www.americanradiohistory.com...PW-1971-08.pdf

Regards,

Nandu.
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Old 4th Apr 2020, 1:15 pm   #18
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Default Re: Top band transmitter

Hi Richard,

A direct link to the article in Practical Wireless is available in this forum itself!

https://www.vintage-radio.net/forum/...6&d=1401744343

Regards,

Nandu.
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Old 4th Apr 2020, 2:30 pm   #19
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Old 4th Apr 2020, 3:37 pm   #20
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Default Re: Top band transmitter

Radio con.feb 1956 page441 -"a small table top transmitter for the lower frequencies " 3.5MHz 2Xef50 and an 807. key in cathode.Les
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