[time-nuts] Agilent / HP 117A on eBay...

Don Latham djl at montana.com
Fri Jul 26 03:34:55 UTC 2013


the side loops are insulated at the top to prevent forming aa shorted
turn. It's a loop antenna that works on the magnetic field component of
the incoming wave, rather than the electric field, like a whip. So, if
you put a bunch of turns inside the loop of conduit, a complete loop of
conduit will be a shorted secondary.

J. Forster
> The HP 117A antenna is a circular shielded loop, about 1 meter or 3' in
> diameter. I never bothered to measure it. It looks to be made out of
> roughly 1" OD aluminum electrical conduit components, a Tee at the top
> and
> a pull box at the bottom. There are three conduit sections, one a
> diameter
> that goes vertically from the bottom pull box to the top Tee. There are
> a
> pair of semicirllas, one on each side.  The two side loop halved are
> insulated from the pull box as I remember.
>
> There is a picture in the 117A manual on the Agilent site, but no
> dimensions I saw. It is a crummy scan. The loop dimensions may be in a
> catalog of the period.
>
> It'd be fairly easy to replicate w/ a hand conduit bender, IMO.
>
> -John
>
> ====================
>
>
>
> I never bothered
>
>
>> Hi Pete, I have a 14" diameter choke ring GPS L1 with a big spike on
>> the
>> top of it, on the peak of the roof :)
>>
>> That certainly gets some stares!
>>
>> As the HP antenna is VLF, is the Antenna Huge?
>>
>> I can't reliably get WWVB in Australia.
>> Lots of fading etcetera, or I'd be in there like a shot :)
>>
>> We do have a beer called VB hmmm..
>>
>> --marki
>>
>> -----Original Message-----
>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]
>> On
>> Behalf Of Pete Lancashire
>> Sent: Friday, 26 July 2013 10:50 AM
>> To: Discussion of precise time and frequency measurement
>> Subject: Re: [time-nuts] Agilent / HP 117A on eBay...
>>
>> I still would like to find one of the HP antenna's just for the looks.
>> Even the 10509A with 13CW4's .. ok the FET version would be better.
>>
>> At least give those passing by something else to point at :-)
>>
>> -pete
>>
>>
>>
>>
>> On Thu, Jul 25, 2013 at 7:09 AM, Burt I. Weiner <biwa at att.net> wrote:
>>
>>> I always wanted on, but with the intention of using it.  To bad it's
>>> now useless now with the new WWVB format, otherwise I'd buy it.
>>> Antennas I got.
>>>
>>> Burt, K6OQK
>>>
>>> At 06:14 AM 7/25/2013, time-nuts-request at febo.com wrote
>>>
>>>> >> Would this box work with the new WWVB format?
>>>> >>
>>>> >>
>>>> >> On 07/25/2013 04:07 AM, Mark C. Stephens wrote:
>>>> >>
>>>> >>> Oh my gosh, a 117A has popped up on eBay!
>>>> >>> Looks in pretty good condition given its age...
>>>> >>>
>>>> >>> Seller claims the antenna will be listed shortly!
>>>> >>>
>>>> >>> Item # 281141315740
>>>> >>>
>>>> >>>
>>>> >>> --marki
>>>>
>>>
>>> Burt I. Weiner Associates
>>> Broadcast Technical Services
>>> Glendale, California  U.S.A.
>>> biwa at att.net
>>> www.biwa.cc
>>> K6OQK
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>
>
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-- 
"Neither the voice of authority nor the weight of reason and argument
are as significant as experiment, for thence comes quiet to the mind."
De Erroribus Medicorum, R. Bacon, 13th century.
"If you don't know what it is, don't poke it."
Ghost in the Shell


Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
Skype: buffler2
www.lightningforensics.com
www.sixmilesystems.com





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