Yaesu FT-817 at full power on 2m upper sideband.
3kHz RBW, 2Mhz span, max hold and me talking to the mic for a moment.
The spurs look bad, but seem to be -67dBc and -62dBc down.
Yaesu FT-817 at full power on 2m upper sideband.
3kHz RBW, 2Mhz span, max hold and me talking to the mic for a moment.
The spurs look bad, but seem to be -67dBc and -62dBc down.
@synx508
Yeah.
And I was advice ages ago that FT-817 should not be amplified, as while it was compliant with regulations, it was not the cleanest of rigs.
Stuffing 160m to 70cm in a box of that size and including 8x AA internal battery means that some compromises likely had to be made.
Improperly stored AN/UPM-84 military surplus spectrum analyzer is not having a good time.
It covered 10MHz - 40GHz.
N connector input up to 12GHz, then waveguides up to 40GHz.
Yeah.
The dial ends at 40.88KMC.
And there also ends this thread.
Klystron oscillator with a big cavity in a trashed spectrum analyzer.
@jmorris
Normal copper tape on a piece of transparent plastic.
If we could get random indium bits as donations at the radio club we would not make Vivaldis from it!
Friends quick antenna build.
copper tape and some plastic as the substrate.
Remember that 100W 30dB attenuator I BBQ'd by running a 15W radio into it in reverse?
Well it looks like this on the inside.
No wonder the wrong side did not survive even 15W.
There was also this thing on the high power input trace in it.
I guess that was done to push it closer to the 4GHz spec of this thing.
How's that for some snowflaking?
And no, the cavity did not have any RF absorber.
Inside an old 7GHz DRO oscillator brick.
From top to bottom:
- Varactor for fine tuning, my guess it is used as part of a temperature compensation loop here. Lightly coupled to the DRO.
- The DRO puck inside it's glass prison.
- Coupling loop for the oscillator and the oscillator transistor.
- Output isolator, made from a circulator with one port terminated.
- Output port on the left side.
-20dB dB sample of the oscillator output signal.
Steel can LM311H high-speed comparator in this old random junk.
What did it do?
No idea.
I guess it squared some input for feeding it to the output.
Proper old school Vero was used in it.
@jmorris
Milled gold plated jumpers.
some of the blue diodes are 1N5711, some are more boring. The black diodes are for higher bands.
The pile also contains 4x SBL-1
A good harvest.
Junkbox 6GHz TWTA
Specified for 5925 - 6425 MHz span, but I hope to run it on the 5760MHz hamband, assuming it has not been burnt out.
#hamradio #5760MHz #surplus #junk
There is even a handy warning note inside the TWTA box to remind you to check that they match.
TWT's are finicky beasts and require exactly the right voltages for proper operation.
Very shiny for +50years old equipment.
@g4dbn @f4grx
Have you been watching Zilipoper by any chance?
Oh cool, he just got a 750W C-band uplink TWTA.
https://www.youtube.com/watch?v=EcNhDwtSw6E
A detour from his usual magnetrons and Tesla coils.
Heh, somebody did not look where they pointed the hot air at.
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