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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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22nd Jun 2019, 10:41 am | #1 |
Octode
Join Date: Dec 2008
Location: Wincanton, Somerset, UK.
Posts: 1,780
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Flexibility of DDS signal generators
A few years ago I splashed out on a Siglent SDG1020 signal generator (20MHz). It has proved invaluable for AM / FM radio alignment, amongst other things.
- both the AM and FM modulation functions are accurate and low distortion: the AM right up to 99%. - precise linear IF sweeps with a sync output for triggering a scope. However, with a bit of cunning you can use these generators up to Band II. E.G.
John |
22nd Jun 2019, 12:28 pm | #2 |
Dekatron
Join Date: Jun 2016
Location: London, UK.
Posts: 3,687
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Re: Flexibility of DDS signal generators
Those modern AWGs are excellent. Totally agree. I've got the Rigol version, the DG1022Z which with a little bit of jiggery you can convince it's the 60MHz model instead of 25MHz as shipped
I haven't tried FM on harmonics yet - good idea though that is! I tend to use mine as an HF signal generator and with the brain transplant it just reaches into 6m on fundamental. Signal quality and phase noise is excellent and output is calibrated in dBm although if you want to go low, an external attenuator or two is required. Also a good tip: if you build a W7ZOI power meter as mentioned in [1], plug that into a Y channel on your scope and the trig output on the signal generator, set it to sweep a log sweep you can get a log/log plot of filter response with a vertical range of 25mV/1dB. Great for IF, LPF stuff. Here's mine with a QRP transmitter LPF [1] https://www.qsl.net/sz1a/download/bu...er%20meter.pdf |