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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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17th Jun 2018, 11:04 am | #1 |
Pentode
Join Date: Nov 2017
Location: London, UK.
Posts: 108
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Getting a Signal Generator
Hello All,
I want to get a signal or function generator to improve my almost non-existent diagnostic skills. My main interest is vintage B&O amplifier/receivers. I'd like to be able to identify faulty/noisy components by following a signal through. I have a 20mHz oscilloscope. A generator of some kind seems preferable to a signal injector/tracer in terms of functionality. Its main use would be in AF boards, but some useability in later IF stages would be a bonus, though that may not be possible within my budget (say up to £60). I'd be very grateful for some pointers. For instance, are the Chinese units any good or should I go for vintage stuff? Many thanks, |
17th Jun 2018, 12:08 pm | #2 |
Rest in Peace
Join Date: Jun 2006
Location: Chard, South Somerset, UK.
Posts: 7,457
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Re: Getting a Signal Generator
There are several Advance sig. gens. (vintage) which will be quite suitable for your needs. Something like a Model 62, 63 or an E2 spring to mind for RF usage. A degree of renovation may be required with these, but it is rare for those models to require anything drastic in that regard. (And if you do get problems, many members here will be able to help you.)
I have no experience of Chinese sig. gens. Al. |
17th Jun 2018, 12:13 pm | #3 |
Dekatron
Join Date: Jun 2016
Location: London, UK.
Posts: 3,687
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Re: Getting a Signal Generator
I have experience with the chinese ones. Run a mile. Advance ones are very nice. I know someone who has one and it’s bang in frequency.
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17th Jun 2018, 12:29 pm | #4 |
Octode
Join Date: Jan 2014
Location: Oban, Scotland, UK.
Posts: 1,129
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Re: Getting a Signal Generator
You are 'hovering' on the border between AF and RF in terms of signal generators.
You could use a PC for AF signals in the audio range to test amplifiers but some dedicated AF signal generators can go up to 1 or 2MHz which also allows for IF tuning in receivers! I 'knocked up' a small high quality single-tone (1kHz) generator with a calibrated output of 10mV, 50mV, 100mV etc that served well for decades! More recently I 'knocked up' a 455kHz sweep oscillator for IF alignment. But if you're on a dedicated path towards servicing/repairing equipment then investing in the best you can afford will save money in the long run - "buy cheap, buy twice" being the warning. Keep an eye open on the auction sites where bargains are still to be had. |
17th Jun 2018, 12:32 pm | #5 |
Dekatron
Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
Posts: 7,670
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Re: Getting a Signal Generator
There's a function gen for sale in the FS section. I got a bench DMM off Mr B, very happy.
Andy.
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Curiosity hasn't killed this cat...so far. |
17th Jun 2018, 12:53 pm | #6 |
Dekatron
Join Date: Jun 2016
Location: London, UK.
Posts: 3,687
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Re: Getting a Signal Generator
I’ve actually got a Leader 17A RF signal generator for sale as well. Just haven’t dug it out yet.
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17th Jun 2018, 1:13 pm | #7 | |
Dekatron
Join Date: Feb 2003
Location: Cottingham, East Yorkshire, UK.
Posts: 5,768
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Re: Getting a Signal Generator
Quote:
Also a 1 kHz sine wave, helpful for AF signal tracing etc nd used to modulate the generator. That won't hang around long when you find it Mr B!
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David. BVWS Member. G-QRP Club member 1339. |
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17th Jun 2018, 1:33 pm | #8 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,903
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Re: Getting a Signal Generator
I bought a Marconi TF2008 in not working condition and fixed it. That's one way to keep costs dowm.... the dial cord was off a pulley and jammed between pulley and chassis.
The RF side does 9kHz to 520 MHz and can do AM and wideband FM. It does sweeps as well so it ticks the Wobbulator box for IF alignment of posh FM tuners It includes a variable frequency wien bridge audio oscillator so it ticks your audio box. Also it has a very good attenuator and good screening so it's OK for sensitivity tests. So with a bit of luok and open eyes, lab grade ones turn up within your budget. David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done |
17th Jun 2018, 2:13 pm | #9 |
Dekatron
Join Date: Jun 2016
Location: London, UK.
Posts: 3,687
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Re: Getting a Signal Generator
Yes I paid a whole £5 for my Marconi 2019A! Shame that blew up
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17th Jun 2018, 9:07 pm | #10 |
Pentode
Join Date: Nov 2017
Location: London, UK.
Posts: 108
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Re: Getting a Signal Generator
Thanks for all your helpful replies. Currently considering my options, but a 2mHz FG looks to be a good choice.
Will certainly be back with some questions about how to use it. Regards |