Wideband quadrature generation

See...

Newsgroups: alt.binaries.schematics.electronic Subject: Wideband quadrature generation (from S.E.D) - IF-Strip-60MHz.png Message-ID:

...Jim Thompson

Nice. From the days when Megacycle was still politically correct and custom pieces were affordable.

It's definitely in Pease's "Troubleshooting Analog Circuits", which is where I first encountered it.

Yep. The book was printed in 1967, so I'm guesstimating I built it in

...Jim Thompson

Also in older ARRL Handbooks. However, less and less people are reading stuff like that. Unfortunately. Or, well, from a business point of view not so unfortunate for guys like me 8-D

crystal

That is such a 1950's homebuilt attitude. Not suitable even for short run production. Where are you going to get the tech's? Can you afford the ones that can do that? Can you afford to do that yourself for even 500 units?

who

PCB

to

crystal

me

That's why I said earlier that I design stuff in a way that it needs zero trim pots and zero trim caps.

But seriously, with some training this is fairly easy. Not far from here in the mountains is a high-tech RF production facility. 10GHz range and such. It is a very normal process for their techs to bend here a wee bit, grind off some over there, snip some here, until it all is nicely within the border contours on the analyzer. Of course, you can't hire some kid off the street and tell him or her to read the SOP and then get going on that stack of mixers over there.

In medical you have to do similar things. For example the fabrication of a signal transformer that is guaranteed to withstand defibrillator shots is not for the faint of heart and can absolutely not be done by just any tech. Requires lots of training. Your life or mine might depend on it one day. Depends a bit on our cholesterol intake ;-)

A lot of TVs used gimmicks, and were built in large quantities. In fact, some used a pair of enameled wires wrapped in thread, to simplify the design, and reduce the assembly time. They looked like they were cut to length, and split at one end before they were dipped into a solder pot. I saw them in the IF circuits of a lot of brands. All they did was cut small amounts, till they got the proper waveform on the sweep generator, marker generator, detector and scope setup that predated network analyzers. If they snipped too much they could gently squeeze the wires below the wrap. This was used from the early B&W sets, to the last of the tube type color sets.