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Lothar, I hate to be stubborn or dense, but where does the marker come from if the "RF is dead on the tracking generator"? I do have an operation and maintenance manual. I quote from the

Isn't that what the 86222 sweeper plugin with the marker option does? Those are pretty common. -- john, KE5FX

they actually made several options on the 8444A, one incorporated another fixed frequency oscillator, this option was created for people using the 8444 with the 8558B which only had the first LO

this is another way but i havent seen anyone using this in centuries, the last time i saw it was on a old jerrold sweeper, everything i had ever since was using the approach i described, problem with

Lets go back to the basics, A spectrum analyzer basically is a swept receiver, in the case of the 8553 you have three conversion steps to reduce the input signal to 3MHz IF, the first LO normally is

lothar baier wrote: There is another way. You sample the RF, mix it with a (frequency settable) oscillator, run the output through a LPF, detector, and comparator and use this output for intensity

Hi Thanks Lothar....that is the unit I use most often and have never had to "take the lid off" (should have looked at the manuals which are out of easy reach before typing !!)I have certainly had

ok for the counter to be able to count the marker frequency it will have to stop the sweep for a short time count the frequency and then keep on sweeping What im trying to get across is that you

Hi, The marker blip, when using an 8443A with the 141T, is simply the trace stopping for the blinking of an eye. The marker intensity control just varies how long it stops for - there is no 'Z'

you are talking about the 8444 not the 8443, the 8443 actually does not require a 500MHz signal Alan Melia <Alan.Melia@...> wrote: Hi, just a though triggered by Chuck's posting.

Now I am getting confused. The spectrum analyzer screen has a line designated CENTER FREQUENCY. As you turn the frequency knob on the 8553B RF section to move a signal peak to coincide with this

Hi, just a though triggered by Chuck's posting. Some of the connectors for the tracking gen were fitted as an "update" I think (without looking at my frame) there is another cable inside from the back

ok there are two basic ways to create a marker in a swept system, one is called RF blanking the other one is called intensity modulation, ok usually you have a control voltage thats proportional to

One very big problem with the 141T frame and its plug-ins, that can cause many a vexing symptom, is the D style connector on the back of each plug-in. The aluminum framework that holds these D style

At 06:06 AM 11/16/2007, you wrote: >----- Original Message ----- >From: "John Day" <<mailto:johnday%40wordsnimages.com>johnday@...> >To:

Ah ha, OK I get it, I guess no reading comprehension score for me that day :) I gues it's still a fair enough deal. I wish I could get a good deal on two 8640Bs, then I could keep one, send you

have you ever considered a 5345A ? they are cheap, and they go to 500MHz The marker does not really say anything, most of the time markers are blanked in on the sweep trace not on the RF level,

It better not :) You want to get your epoxy gears out of the RTV mold, right? Cheers, Kuba

Anyone have a schematic for the HP 6220B power supply? Mine's working, but the meter is off. It even reads negative at very low voltages. I've compensated somewhat with the mechanical meter zero