[Hallicrafters] Hallicrafters and Sweep methods

[Jim Liles]

Please add your sweep techniques and setups.

-----Original Message----- 
From: Chris Farley
Sent: Wednesday, July 22, 2015 11:30 AM
To: Jim Liles
Subject: Re: [Hallicrafters] Hallicrafters SX-88


I picked up an 8568B and got it working several months back.  How have you
found it useful for sweeping filters without the mating tracking generator?

Regards,
Chris


From: Jim Liles
Sent: Wednesday, July 22, 2015 1:07 PM
To: Chris Farley
Subject: Re: [Hallicrafters] Hallicrafters SX-88


Chris,

The 8568B has a dual display function as well as what they call MAX HOLD.
If you set it for MAXHOLD the peak of a sweep will be held.  If you sweep a
filter using MAXHOLD, the 8568B will intercept the sweep somewhere and paint
a dot at that point.  Simply let it run while sweeping and it will finally
paint the whole wave form dot by dot.  Takes a few minutes but is beautiful.

Using a tracking generator locks you into a fairly high signal level.

An example of using the 8568B to paint the MDS of a receiver.  We sweep
a –140db 5Kc wide signal into the antenna lead and attach the 8568B to the
output of the filter using maxhold.  Let it paint the waveform then
disconnect the sweeper and connect a 50 ohm terminator to the antenna
connector.  Now use the second trace to paint just the noise out of the
filter.  View both together and voila you see the MDS.

Hundreds of other uses to follow.  I’ll put the MDS traces on my web site
and email you.

Kindest regards Jim K9AXN