[time-nuts] HP 117A

[Max Robinson]

Mike wrote.

Skin depth at 60 KHz is much larger than at HF frequencies,

I knew that, why did I forget.  I must be getting old.

Regards.

Max.  K 4 O D S.

Email: max at maxsmusicplace.com

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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 5:19 PM
Subject: Re: [time-nuts] HP 117A


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
>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: "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.
>>_________________________________________________________________
>>Hotmail® goes with you.
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>
>
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