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The early 8970A Noise Figure Meters used the same battery pack for the same purpose though it appeared to serve a larger number of RAM's than the 8350B. Later, the NF Meters were modified to eliminate

Have a look at the Ailtech 757 where he first mixer is an HP comb generator driven beyond its normal specs. On Sunday, December 15, 2019, 5:33:12 PM GMT+1, Staffan <testjarfalla63@...> wrote:

Rick, Be prepared to pay big $$$ unless you happen to luck out and find a bargin. Even a non-working 3458A goes for over $1000. This instrument is rarely found in a non-working condition. The general

Hello, I'm working on fixing a VNA with a comb mixer (input 360 - 540 MHz) as the first stage, covering 270 MHz - 20 GHz (sic). It seems the driver amp was off tuning and only output approximately

Thanks – I tried to order via their website but failed (?). I’ll ? them on Monday David Sent: 15 December 2019 15:27 To: [email protected] Subject: Re:

Microchip Direct have over 1000 PIC17C42A-25I/L in stock at ?7.21 each. The hgher speed should not be an issue.

Microchip never obsoletes a product or so they told me 10 years ago. If that is true you should be able to get one direct. Chuck

Hi Mark From the results given it could be that as stated earlier it requires realigning The master yig is multiplied several times to give the full band so during alignment the switching between the

Thank you for the manual Best Regards Paul

Okay Jeremy I appreciate it.? I have two 200CDs and am sure I can glean a matched pair of tubes from the four.? In any case I am interested in taking this far enough to at least approach the amount

Toby, check the HP Archives for the manuals, search “HP 10017A manual”. I also may have the probes and grabbers. I will have to check my stock for extras. Contact me @ donbitters@... with

There are a number of tricks that have been published over the years. I’ll send you copies tomorrow. In the meantime, ? balance the two pairs of tubes that make up the push-pull oscillator. The

What's your secret Jeremy?? I have a couple of 200CDs but they are nothing to write home about regarding distortion. Bob K6DX

My650A did fairly well distortion-wise but my favorite is the 200CD. With a few tricks and a little tweaking I was able to get it down to 0.04%, well below spec. Jeremy [email protected]> wrote:

I know this doesn't help but I did want to say that, in all my years of working with HP gear, this circuit is about the worst design.? I have repaired my 651A a couple of times and have never been

After I clean up and repair the damage to the boards on either side of the pack, I remove the pack "socket" and wires, and throw it all away. There is no significant reason to keep it, as it only

It is the same exact pack as the HP35/45/55/65/67 used. The pack is really, really unnecessary. Its purpose is to prevent you from having to reset the front panel every time you turn on the generator.

Almost certainly 50Hz AM modulation - 20msec per cycle. Does touching the 645 chassis change the amplitude of the modulation, if so check the chassis ground at the power cord input, you may have an

Mark: Hi...Shift 92 and Shift 93 allow the RPG on the plug in to tune through some of the constants in the output tuning. See if you can find a number on the display that solves the output issues. be

On Sun, 15 Dec 2019, Paul Bicknell wrote: Eh... As I said I have a fully working/refurbished/calibrated 83570A but that is a single-band 18-26.5 GHz plug-in, not a wide range one. As a matter of fact