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Re: HP-8443A Tracking Generator Problems
I said that two sentences later: "At narrow RBW settings, you have to fine-tune the TG to be exactly on frequency, that's the screwdriver adjustment on the front panel. Since you don't know that
By Dave Wise · #9121 ·
Re: HP-8443A Tracking Generator Problems
ONLY, if the TG is actually putting out the same frequency as the SA is tuned to. I have an AIL 757 and TG. If the tracking control is not tuned right, the YIG in the SA's front end will be tuned to a
By J Forster <jfor@...> · #9119 ·
Re: HP-8443A Tracking Generator Problems
Take a look at the Wiltrons. The advantage is that the marker accuracy is independent of the GHz/Volt calibrations. In fact, I have a little home brew unit in a Tek TM-500 PI that does just that...
By J Forster <jfor@...> · #9118 ·
Re: DIY: Repair of HP Step Attenuators
FWIW, do it over a tray w/ turned up edges. I just spent over an hour chasing small bits of an assembly because I ignored that precaution. Best, -John g47g wrote:
By J Forster <jfor@...> · #9116 ·
Re: Hp-8443A Tracking Generator Problems
They did call them by an obsolete name, "selectro" (or was it "sealectro"?).
By Dave Wise · #9117 ·
Re: Hp-8443A Tracking Generator Problems
usually HP used SMC and SMB on the inside of most instrument, i havent seen anything special in any of the HP Gear Dan Rae <danrae@...> wrote: David C. Hallam wrote: David if you
By lothar baier <microwaveengineer1968@...> · #9115 ·
Re: Hp-8443A Tracking Generator Problems
David C. Hallam wrote: David if you do look for another one, try to find a later one with LED displays rather than nixie tubes, they are a little bit more reliable. But they are pretty easy to work
By Dan Rae · #9114 ·
Hp-8443A Tracking Generator Problems
Thank you to all who replied to my request for help. I now understand more about the operation of this piece of test gear and also believe the solution to my problem is more complex than I originally
By David C. Hallam <dhallam@...> · #9113 ·
Re: DIY: Repair of HP Step Attenuators
Thanks. I'll try to disassemble the unit, then I hope I'll see the reason of the failure. <microwaveengineer1968@...> wrote: cam in place is missing
By g47g · #9111 ·
Re: HP-8443A Tracking Generator Problems
You don't even have to select zero span. The function and purpose of a TG is to output, at all times, whatever frequency the SA is listening to. As the SA scans, so does the TG. In all scan modes,
By Dave Wise · #9110 ·
Re: HP-8443A Tracking Generator Problems
I cant be bothered to look at the manual as it it out of reach, but has it occured that you are assuming that the marker and RF output are connected......they may not be. Check you actually have a RF
By Alan Melia · #9112 ·
Re: DIY: Repair of HP Step Attenuators
most likely the cam is worn out or the little ball that locks the cam in place is missing g47g <g47g@...> wrote: Hi Lothar, I have a 8495A manual step attenuator, and though it has
By lothar baier <microwaveengineer1968@...> · #9109 ·
Re: HP-8443A Tracking Generator Problems
yes i think so John Miles <jmiles@...> wrote: Isn't that what the 86222 sweeper plugin with the marker option does? Those are pretty common. -- john, KE5FX
By lothar baier <microwaveengineer1968@...> · #9108 ·
Re: DIY: Repair of HP Step Attenuators
Hi Lothar, I have a 8495A manual step attenuator, and though it has the correct attenuations on every step(?), but it needs force to switch the attenuator in different positions, and also the well
By g47g · #9107 ·
Re: HP-8443A Tracking Generator Problems
David C. Hallam wrote:
By Dan Rae · #9106 ·
Re: HP-8443A Tracking Generator Problems
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
By David C. Hallam <dhallam@...> · #9105 ·
Re: HP-8443A Tracking Generator Problems
Isn't that what the 86222 sweeper plugin with the marker option does? Those are pretty common. -- john, KE5FX
By John Miles <jmiles@...> · #9104 ·
Re: HP-8443A Tracking Generator Problems
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
By lothar baier <microwaveengineer1968@...> · #9103 ·
Re: HP-8443A Tracking Generator Problems
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
By lothar baier <microwaveengineer1968@...> · #9102 ·
Re: HP-8443A Tracking Generator Problems
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
By lothar baier <microwaveengineer1968@...> · #9101 ·