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Author Topic: Questions about using Signal Generator and Signal Attenuators  (Read 322 times)

HAMHOCK75

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Re: Questions about using Signal Generator and Signal Attenuators
« Reply #15 on: May 28, 2022, 07:05:04 AM »

I used FedEx to ship before. Based in the weight and what they billed before, it would be about $105 for their home delivery service. The box will be 24x24x12 and weigh about 50 lbs. The HP8640B by itself weighs in at 43 lbs. There will be no manual but it is available online.

The alternative is if know someone who has an account with any of the shipping services, you can create a shipping label which we just put on the box. The freight will be billed to them so I do not need to be involved with that part. Some people ship enough that they get a good discount.
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WA4ZYN

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Re: Questions about using Signal Generator and Signal Attenuators
« Reply #16 on: May 28, 2022, 06:07:14 PM »

Yikes.  That will be more than I can afford to do right now, but thanks for considering.  Shipping is just about to make even a free thing unaffordable.  Thank you for your time and consideration, my friend!

73 es tnx agn
Francis WA4ZYN
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K1KIM

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Re: Questions about using Signal Generator and Signal Attenuators
« Reply #17 on: May 29, 2022, 08:00:26 AM »

I have a old B&K signal generator I used for testing my FR-101 front end and built a set of attenuators to bring my output down to 0.5µV. Of course I realized after building them that the receiver has a built in signal generator. Oh well.....I now have a set of attenuators!

They are easy and fun to make. 35mm x 35mm x 55mm aluminum project boxes with SO-239's on each end.

I daisy chain a 52dB and a 30dB to get down to 0.5µV.

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So Many Toys.......So Little Time!

HAMHOCK75

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Re: Questions about using Signal Generator and Signal Attenuators
« Reply #18 on: May 29, 2022, 02:45:10 PM »

Yes, shipping costs can be unpleasant. A local ham bought an ALS1306 amplifier from MFJ. It has had three failures but he has been allowed by MFJ to have it serviced here in CA with MFJ covering at least some or all the service fee ( it is still under warranty ) because the cost of shipping it back to MS is so high.
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G4AON

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Re: Questions about using Signal Generator and Signal Attenuators
« Reply #19 on: June 05, 2022, 02:28:27 AM »

A signal generator is one of those items of test equipment that is essential if you repair radios for a living. Whether buying a used commercial grade signal generator, is worth the expense for occasional hobby use, depends on how deep your pockets are. A half decent one costs as much as a new HF transceiver.

You can do a lot with a well shielded oscillator and equally well shielded cable/attenuators. Think in terms of dBm levels, rather than mV or uV, it’s a lot easier.

A NanoVNA could be a cheap means of checking filters, rather than hoping to use a signal generator sweeping across the filter. I use a Rigol spectrum analyser with a built in tracking generator, it works well but cost more than ten times the cost of a NanoVNA. You can see the type of filter sweeps it produces on my web site:
https://www.qsl.net/g4aon/g4aon_ssb_tx/

I swapped s dual band FM mobile for a non working Marconi 2018 signal generator that was an easy repair (tarnished tin plated EPROM pins, a very common problem in 1980s vintage test equipment). I sold that and now use an IFR 2025, it was government surplus, looked brand new, had a shrink wrapped manual and padded carry bag. Sometimes you’re lucky and find good gear, but there is a lot of junk around.

73 Dave
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