[Boatanchors] HP 5245L/5243B Freq counter question

[Dave Brown]

Peak the signal on the LOWER of the two spots that give a reading and 
just add the nixie display to the nearest (usually damn close to) 
indicated multiple of 50MHz on the 5253B dial.

Using the higher frequency peak/spot requres the nixie display to be 
subtracted from the indicated 50MHz multiple. It's occasionally useful 
to use both peaks/spots if there's any doubt as to what you are 
measuring, for confirmation of the true frequency, but rarely 
necessary.
73
 Dave, ZL3FJ

----- Original Message ----- 
From: "Philip Atchley" <beaconeer at sbcglobal.net>
To: <boatanchors at mailman.qth.net>
Sent: Friday, February 04, 2005 12:32 PM
Subject: [Boatanchors] HP 5245L/5243B Freq counter question


> Hi,
>
> I'm not on the Test Equip list so I thought I'd ask the question 
> here (and this sucker is heavy/old enough to qualify as a BA).
>
> I'm the proud owner of a Hewlett Packard 5245L frequency counter 
> (remember those Nixies) with the 5258A Sensitive Pre-scaler (good to 
> 200 MC).  Anyway, it works well and seems to be fairly accurate, and 
> I like the timebase outputs on the back.  With that prescaler it is 
> quite sensitive for "sniffing" weak RF.
>
> The question is concerning a 5253B Frequency Converter plug-in good 
> to 500 MC.  I have the 5253B converter sitting here and will be 
> returning it to it's owner this weekend.  I checked it out for him 
> and it "seems" to work FB.  It's been a good 30+ years since I last 
> used one and I recall that you put in an unknown signal over 50 MC 
> and tune it to peak the meter and obtain two different readings. 
> There is then some "math" involved to obtain the "true" frequency 
> reading, but I don't recall what it is.
>
> The operation of the plug-ins don't seem to be covered in the 
> (loaned) 5245L Service Manual.  But I'd like to return the plug-in 
> to it's owner with instructions on "How To Use It", at least in a 
> basic format.
>
> Help!
>
> 73 de Phil,  KO6BB
> 991 Different NDB's heard to date.
>
> http://www.geocities.com/ko6bb/
> Merced, Central California, 37.3N  120.48W  CM97sh
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> Assistance: dfischer at usol.com **         $$ For vintage radio info, 
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>
>
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