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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders. |
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Thread Tools |
13th Jul 2019, 6:14 pm | #21 |
Triode
Join Date: Jul 2019
Location: Harwich, Essex, UK.
Posts: 39
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Re: AM FM alignment
I guess it is ott but I am hoping to progress with the hobby and maybe even use it to find alternate employment in the future depending on how things go. I am interested in all sorts of electronics, mainly audio at the moment but I would like to try other things as well. If they turn out to be too much in a few years time, I can sell them again for a small loss. I am also interested in amateur radio, antenna design etc.
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13th Jul 2019, 6:16 pm | #22 | ||
Triode
Join Date: Jul 2019
Location: Harwich, Essex, UK.
Posts: 39
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Re: AM FM alignment
Quote:
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13th Jul 2019, 9:54 pm | #23 |
Octode
Join Date: May 2016
Location: Oxfordshire/Bucks borders, UK.
Posts: 1,604
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Re: AM FM alignment
Something like an Advance type 63a or one of those Taylor generators. Can pick them up for about £10.
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Avometer, vintage Fluke and Marconi collector. Also interested in vintage Yaesu and KW. |
13th Jul 2019, 10:32 pm | #24 |
Octode
Join Date: May 2016
Location: Oxfordshire/Bucks borders, UK.
Posts: 1,604
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Re: AM FM alignment
Oh and they're valve driven, so even more in keeping with the vintage of our hobby.
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Avometer, vintage Fluke and Marconi collector. Also interested in vintage Yaesu and KW. |
15th Jul 2019, 9:37 pm | #25 |
Triode
Join Date: Jul 2019
Location: Harwich, Essex, UK.
Posts: 39
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Re: AM FM alignment
I have purchased a generator today made by Phillips/Fluke. It seems to do everything I want. I will grab a photo of it when it arrives. I am still going to keep an eye out for some vintage test equipment but the prices seem very high for what you are getting.
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15th Jul 2019, 9:45 pm | #26 |
Dekatron
Join Date: Aug 2013
Location: Wigan, Greater Manchester, UK.
Posts: 9,433
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Re: AM FM alignment
Unless the generator has recent calibration it would be wise to test as much as possible against known frequency standards and radio stations.
Zero beating against MW/LW/SW station of know frequency.
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Frank |
16th Jul 2019, 6:27 am | #27 | |
Dekatron
Join Date: Apr 2009
Location: Oxfordshire, UK.
Posts: 4,935
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Re: AM FM alignment
Quote:
B
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Saturn V had 6 million pounds of fuel. It would take thirty thousand strong men to lift it an inch. |
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16th Jul 2019, 7:35 am | #28 | |
No Longer a Member
Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,679
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Re: AM FM alignment
Quote:
Then your entire RF generator is calibrated accurately at ALL frequencies, because what you get out, is what you see on the counter/meter, not some other frequency "suggested" by a dial pointer. So the whole calibration issue over the entire range of frequencies from the generator is automatically dealt with and in use you can be confident that its accurate. |
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16th Jul 2019, 8:54 am | #29 | ||
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,903
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Re: AM FM alignment
Quote:
They had some rather rough sig gens which worked well enough to fix sets with something dead along the signal path. They had no hope on frequency accuracy Then they had the gorgeous BC221 frequency meter. An ultra-precision VFO with hundreds of pages of automatically typed individual calibration chart, a crystal reference oscillator giving accurate harmonics right up the band, and then a mixer/headphone amp so you could tune to the reference or an input to correct the table. The tuning knob turned 50 revs across its basic band the knob had a vernier to 1/1000 of a rev. The BC221 did not do low level sensitivity tests, it did not do modulation. It did frequency accuracy and it did it amazingly well. Other sig gens did mod or were screened well enough to go to low levels. The BC221 could monitor them or calibrate them, but it might be wasted effort if they weren't stabe and repeatable. They had the means, but it was tedious and took skill Good modern digital stuff is a walk in the park by comparison. Poor modern digital stuff can be crap, leaking big amounts of signal, drifting, noisy. Whichever era you opt for, there is good stuff to be sought and junk to be avoided. David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done |
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