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Hi Jerry, I (also) wish I understood fully but, based on equations of primitivity/permeability of free space and has been used practically (afaik) in design of some rather high gain antennas, have to

Hi Guys, Apologies for the hugely off topic question but as you guys are so into RF (and its been a little quiet in last few hours ;) I was hoping someone might be able to answer a simple question,

Very new to power sensors and was wondering if someone had the time to explain a few things with me. 1)When and why would you select one type of sensor over the other? 2)Do both sensors work with the

Hi all, has anybody some service information, schematic of a HP117A VLF comparator ? Any help appreciated. Regards Antoon

Tks John You're quite right , of course.- I actually want info on the 2650A for making up a 'modern equivalent' for phaselocking an older klystron generator- the 620B, which covers 10 GHz OK. But in

i have found some very cheap sources of 30 pin and 36 pin genuine cinch solder eyelet connectors "some ever are genuine card extender types with terminals bent for card extender applications. i also

Hmmm, I might have one of those in the basement. What model number is it? I'll look & email you later. complained for then, Sadly, HP lost sight of the HP way. I know that many of us who were very

My reminiscing, I used to have two of these in my house, saved on the heating bill!

Dave, my boy. I never realised you needed a handbook for a 2650A, I have the very thing, right here in front of me. It is 1964 printing with the modification data to use various other mixers. The 934A

zebra strips go bad

Hey! hey! 'Nuff 'disparagement' for 8690s- still have and use one often! With a set of PIs from 100 KHz to 18GHz as well... But it surely IS heavy..... DaveB, NZ (Still after a 2650A synchroniser

It`s a Rohde & Schwarz VHF - UHF MESSEMPFANGER Test Receiver Model ESU 2, Number 252.0010.52 [further numbers are obliterated] Serial Number : 40.00138. [whew!] I have posted a photo of THE

My gosh! I wouldn't want one of those nowadays! But I suppose that was what I used before the two rack 8620/9845 based versions. I do recall an automated spectrum analysis system based on 141T's that

Which model? Or give us a photo of the unit so we can see which one! John

My gosh! I wouldn't want one of those nowadays! But I suppose that was what I used before the two rack 8620/9845 based versions. I do recall an automated spectrum analysis system based on 141T's that

Thanks to all who have replied. It seems that the "junction block" I mentioned may be worth concentrating on. The item in question consists of HP part numbers 00181-04101 COVER: HV CONNECTOR,

But before the 8620 came out I suppose we MUST have used 8690's! No question about it. I have two of them (one incomplete). There was the 8690 MF and a PI holder for 3 heads. The systems went from

As most of the group appear to be back from holiday, I`m mentioning this again. I have one of these receivers [what a beauty!], but need service information, particularly schematics of the various

Golly, that goes back! That would be 8410A era in the very late 60's or early 70's. By the early 80's the 8409 systems used the 8350 series sweepers, but I do recall in the 70's having units with the

Hmmm, I don't have the documentation handy. But it sounds like the box used for phase-locking an 8620 series sweeper plug-in to a 3555A generator in the 8409 network analyser systems. I think I still