开云体育

Bruce,

Thank you for pitching in.?

Yes, upon restarting the unit, it goes to 1MHz and -86.98dBm amplitude,?which I think is default. Everything display-wise seems perfect. Except maybe the issue of no?buffer time to?allow the LO to reach temperature, which I find odd. Maybe the LO is offline? Which may explain no sinewave at output.?

I reconnected by hand the rigid line. Not sure if properly, as I don't have a brass-torqued SMD wrench. I assume the worst that can happen with that is a non-leveled output, but not missing altogether. Not knowing more on the history of the unit, I assume maybe my handling of the shielded modules may have severed the signal path somehow. Though I generally?have a very soft and?overly planned touch, if anything, so maybe the history of the unit is the issue. I dunno.?

I will be looking into examining the signal path for any potential interruptions. Given the history of the unit I tend to think it should come back online?within spec,?but that's not what we're seeing here.?

Radu.?

On Sat, Sep 17, 2022 at 9:25 PM Bruce <bruce@...> wrote:

Do you know at power up the output is ~ -80dBm - try setting the?
amplatude to 0dBm and be sure you reconnected the hardline from the RF?
unit to the attenuator.? Any front panel diagnostics lit ???

Cheers!

Bruce

Quoting Tom Lee <tomlee@...>:

> Great news, indeed. Keep going, Radu!
>
> -- Cheers,
> Tom
>
> --
> Prof. Thomas H. Lee
> Allen Ctr., Rm. 205
> 350 Jane Stanford Way
> Stanford University
> Stanford, CA 94305-4070
>
>
> On 9/17/2022 20:27, Radu Bogdan Dicher wrote:
>> Great news, folks.
>>
>> After finding out both A15CR1 and CR2 were shorted, I replaced them?
>> with 1N4003s, and all rails are now coming online in spec?(while?
>> having the board out, I also replaced all 10uF caps). Now the?+15V?
>> is just a hair off at 14.987V (should be within 0.01V of 15V), but?
>> I can't imagine that's a huge deal.
>>
>> However, I don't seem to see any signal coming out of it. Learning?
>> how to use it, so take that with a grain of salt.
>> Radu.
>>
>> On Sat, Sep 17, 2022 at 6:54 PM Radu Bogdan Dicher via ?
>> <> <vondicher=[email protected]> wrote:
>>
>>? ? Well, after finally taking this apart (I'd post pictures, but I am
>>? ? a bit ptsd'ed...) I have two shorted diodes on A15 - CR1 and CR2.
>>? ? I am thinking vanilla 1N4148 would be OK in this position - thoughts?
>>? ? Thank you,
>>? ? Radu.
>>
>>? ? On Sat, Sep 17, 2022 at 5:30 PM Radu Bogdan Dicher via
>>? ? <> <vondicher=[email protected]> wrote:
>>
>>? ? ? ? Raymond, Clay,
>>? ? ? ? You both sort of got beat by a hair with the 4 youtube videos
>>? ? ? ? Clay is talking about. Must be this:
>>? ? ? ? .
>>
>>? ? ? ? And yes, I take back my statement on the overall assembly
>>? ? ? ? design of this unit. I didn't know there's just one SMA
>>? ? ? ? connecting?the shielded modules (there's actually several in
>>? ? ? ? my unit as to, I think, the youtube sample, but they're not
>>? ? ? ? rigid lines), but overall, it's a breeze to take apart (once
>>? ? ? ? you know what the correct path is).
>>
>>? ? ? ? Thank you both! On to the work for me.
>>? ? ? ? Radu.
>>
>>? ? ? ? On Sat, Sep 17, 2022 at 4:42 PM Raymond Domp Frank
>>? ? ? ? <hewpatek@...> wrote:
>>
>>? ? ? ? ? ? On Sun, Sep 18, 2022 at 01:22 AM, freshndaire wrote:
>>
>>? ? ? ? ? ? ? ? I would not call this unit hard to service or a poor
>>? ? ? ? ? ? ? ? mechanical design.? Pull the big aluminum hunk and you
>>? ? ? ? ? ? ? ? have lots of access!? The synthesizer module has 3
>>? ? ? ? ? ? ? ? long bolts holding it in.? Remove the SMA Semi-rigid
>>? ? ? ? ? ? ? ? coax cable from the module's backplane then pull the 3
>>? ? ? ? ? ? ? ? screws in the middle and you can lift the synth module
>>? ? ? ? ? ? ? ? and set it aside with the other cables plugged in IIRC.
>>
>>? ? ? ? ? ? So my memory served me right!
>>
>>? ? ? ? ? ? Raymond
>
>
>