[Hallicrafters] Hallicrafters and Sweep methods

[Jim Liles]

-----Original Message----- 
From: Chris Farley 
Sent: Friday, July 24, 2015 2:08 PM 
To: Jim Liles 
Subject: Re: [Hallicrafters] Hallicrafters and Sweep methods

Jim, 

OK so if I'm reading this right, you put the 8658B into MAXHOLD which I assume is sort of a memory scope mode, and then manually sweep through the range of interest with a signal generator.  My main sig gen is a (yeah yeah I know they aren't the greatest) 8656a or b, but I do also have a 606B.  The latter would probably be much better for this, being the 8656 will only tune in steps.  A working 8640B would probably be ideal, here.  

Am I close? 

C



From: Jim Liles <hallicrafterssr2000 at k9axn.com>
To: Chris Farley <kc9ieq at yahoo.com> 
Sent: Wednesday, July 22, 2015 1:07 PM
Subject: Re: [Hallicrafters] Hallicrafters Sweep methods

Chris,

That’s one way to do it but using a sweep generator is easier.

If you don’t have a Sweep generator you can improvise by using a function generator to inject a ramp into the signal generators FM port.  

Used an 8640B, ramp generator, and 141T Spec analyzer for years.  The 141T has a storage scope function but is very difficult to use.

Have used the 8568B for many years since because setup time is nothing and you can store and retrieve a setup in the push of a key.  

The 8568B is one of few instruments that will cover 200cycles to 1.5Gc.  Works great for audio as well as RF.

------------- ALSO ------------------

We do a full analysis of every stage measuring Gain, MDS, IMD, Birdies, and noise levels simply by slipping an ungrounded copper shield around each tube connected to the 8568B and for small signals through an 8447D preamp.  A real time saver for regression testing.

G-day to you Kindest regards Jim K9AXN





     

Kindest regards Jim K9AXN