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Sandra - I'm going to bother you about the SMA induction soldering work. What type of connector did you use?? Did it have a seperate center conductor pin or did it use the coax center conductor? If

Church Roger that, The thing that helped me down the wrong path is the hybrid package. Electrically it's radial, mechanical is axial...something new for me. After extracting my head I re-ran cap and

Well, the whole world uses 10MHz for everything, so it's a reasonable assumption. However, the 8640 predates that convention, and quite a few things back then used 5MHz. Glad the group could assist

HI Dave, Mike and Frank. Another case of FRTM? first read the manual?? page 22 of 247.? 5 mc Not sure why I thought it was 10 mc but that was a canned oscillator I had? .. Well that was quick &

Hi all Just a bit of information the list below is not the complete list of the CLIP drawings for the 70900A as it comes in 2 large folders volumes 2 & 3 this is the same arrangement for the 70900B

As Dave said, the mainfarme contains a power supply that converts line to 40 kHz for distribution to the modules. Each 1/8 module was allowed 20W max. The LO was therefore "stuck" with an allocation

it's actually selectable between 5 MHz and 1 MHz via jumpers located inside the counter assembly. And no 10 MHz. Frank IZ8D

Yes, using a 10 MHz reference instead of a required 5 MHz would result in reading half of the input frequency. 73 - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115

On November 24, 2021 11:43:28 AM "Jerry Meyerhoff, JDM LABS" <jerrybikes1@...> wrote:>Following this thread with keen interest. I could be wrong, as I don't have a manual in front of me, but I

Hello Group. Following this thread with keen interest. Perhaps some advice on this problem will be applicable to my problem : ** Counter displays exactly 1/2 the output frequency on all bands ** 8640B

This isn't the case for 70K-series power supplies; they are 100% HP. They are specialized (and odd) designs. The enclosure has a large power supply that converts line voltage to bulk AC power of 20V

I forgot to mention this. The capacitors in question here look like typical cylindrical Al electrolytics, but they have a third lead coming out from the *top* of the Al can. See the datasheet for the

Yes there are. IBM used two types on boards from mainframe/midrange systems, three- and four-lead capacitors. They're usually +-+ or +--+, to solve the orientation problem. These boards were typically

The 70900X and 70XXXX power supplies were never bought outside (obvious, the 3 lead capacitors). The A3 power supplply board is on the 70900B CLIP

The power supply's schematic probably lives in one of many Chinese power supply manufacturer's archives. By the time the 70000K series came around, it was common for HP to buy their power supplies

Depending on the manufacturer, the lead arrangement had another more practical purpose, it made capacitor orientation irrelevant. The outer leads were welded to the aluminum can, and were by

<emanuele_girlando@...> wrote: aux output you mean? One of the rear there're two output connectors, one is only for the 5 MHz (or 1 MHz) fixed internal reference. The counter input

Francesco, we cross posted. If not EECL, what? The most intriguing behavior is "External counter input works OK in the 0-10Mhz range, but doubles the reading in the 10-512Mhz range (BUT not if signal

<emanuele_girlando@...> wrote: when that IC dies, usually the counter doesn't show any count when switched to the high frequency input. I've done a similar replacement as described in

I've received the manual. I am going to go through the counter tests to isolate the fault. I suspected the unobtainable? EECL front end chip. Just in case, does anybody have experience replacing it