Products > Test Equipment
Fool for the 8656A Sig Gen
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Swainster:
Great news indeed! Interesting that the screw retains the cover on the 8656a. On my b version, there is just a clip on plastic cover for each package. Also, I don't recall the paint being removed where the regulators are mounted, but I haven't needed to do any work in that area.

Hi Brumby, spares unit you say?... Actually my 'B came with a spares unit which is only missing its power transformer (and a burnt out inlet filter). I understand that the previous owner of the 2 units 'repurposed' the transformer for a DIY project. I'd be interested in buying a replacement transformer to complete the unit. That said, posting a heavy item like that to Singapore is probably pretty painful on the wallet.
jrharley:
Thanks again swainster, Tony_G, et al, it's a good place to pause I think.

I'll spend a little time cleaning up the scene of the crime, documenting the project file a bit and getting the shop set up for the next challenge on the 8656A. I want to run it through the primary checks for instance, to see what I can learn. Then of course I can start to look at the attenuator. Appreciate the offer Tony_G, we'll see how things go.

In the meantime I'm going to see if I can cal up the little BK Precision spectrum analyzer. I got it for a song on the bay recently. It looks like it had been mishandled by impatient hands, but after some work on things like shafts to potentiometers, it seems to be functioning on a basic level. The "calibration" procedure looks to be pretty straight forward and done from the front panel.

Report back on the 8656A in a bit.......

JRH
Tony_G:
Fingers crossed for your SigGen workout.

I couldn't tell from the photos or the schematic, do those missing actuators disconnect the N-Type on the front from the rest of the generator or are you just missing the ability to add in attenuation?

TonyG
jrharley:
Appreciate it TG. Here's a couple pics of the attenuator cavities on first open for reference. We'll be gettin' the sleeves rolled up for this area come this weekend. (I'm not sure I'm understanding your question just yet).

Had to LOL at myself upon diving in to the Spectrum Analyzer calibration. The irony is, that I really need something like the 8656A to do said calibration! We'll get back to that later.... :)

Meanwhile, I'm lettin' off steam by rubbing on the cabinet of a 1948 Delco R-1233, all American five radio. Hoping to get it ready for car wax before weeks end. There's an astonishing amount of tar on it

Later......

JRH
Tony_G:
I was wondering how the actuators work to switch in and out the various resistors for the attenuator segments - It appears that they slide back and forth rather than lift.

With those missing parts then you won't actually get a signal out of the N-Type connector on the front of the unit (ie while the unit may "work" there will be no signal).

Sorry, I can't help with removing that cover.

TonyG
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