[time-nuts] HP 117A

Mike Fahmie mpfahmie at lbl.gov
Wed May 6 22:19:23 UTC 2009


The manual is at home (I'm at work), but I think it said something like 50 
or 100 feet.  Mine is about 50 feet away with no apparent problems.  Skin 
depth at 60 KHz is much larger than at HF frequencies, that's why the 
shielded RF amp box is so thick.

-Mike-
WA6ZTY

At 02:32 PM 5/6/2009, you wrote:
>Thank you.  Do they give a number for the distance between the receiver 
>and antenna?
>
>Regards.
>
>Max.  K 4 O D S.
>
>Email: max at maxsmusicplace.com
>
>Transistor site http://www.funwithtransistors.net
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>----- Original Message ----- From: "Mike Fahmie" <mpfahmie at lbl.gov>
>To: "Discussion of precise time and frequency measurement" 
><time-nuts at febo.com>
>Sent: Wednesday, May 06, 2009 3:12 PM
>Subject: Re: [time-nuts] HP 117A
>
>
>The HP117 manual cautions you to keep the antenna far away from the
>receiver for just that reason!
>
>Take a good look at the electrolytics, even the tantalums in the shielded
>box. I had to replace most of them.
>
>-Mike-
>WA6ZTY
>
>
>At 07:36 PM 5/4/2009, you wrote:
>>When someone posted the message about the HP 117A being on eBay I went 
>>and placed a bid on it.  I won it and am looking forward to firing it 
>>up.  I already have the HP loop antenna with the newvistor amplifier.  I 
>>have been trying to build a receiver of my own for the antenna but it 
>>seems a lot harder to keep things from oscillating at 60 kHz than it is 
>>at 14 MHz.
>>
>>Regards.
>>
>>Max.  K 4 O D S.
>>
>>Email: max at maxsmusicplace.com
>>
>>Transistor site http://www.funwithtransistors.net
>>Vacuum tube site: http://www.funwithtubes.net
>>Music site: http://www.maxsmusicplace.com
>>
>>To subscribe to the fun with tubes group send an email to,
>>funwithtubes-subscribe at yahoogroups.com
>>
>>----- Original Message ----- From: "Mark Sims" <holrum at hotmail.com>
>>To: <time-nuts at febo.com>
>>Sent: Saturday, May 02, 2009 7:24 PM
>>Subject: [time-nuts] Chart recorder consumables (was HP 117 paper)
>>
>>
>>
>>Don't know what it fits,  but it's cheap....  Ebay item 120412680477.  It 
>>is apparently 6" wide, trac drive.
>>_________________________________________________________________
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