[time-nuts] Re: Query about List and about 10 MHz Distro

[Mark Spencer]

This has been an interesting thread. 

I purchased some 1/4" FSJ with BNC connectors from the usual auction site years ago for time nuts use but never installed it.  It does seem to be a bit of a hassle to use in my time lab (I do use some FSJ with N connectors in parts of my home amateur radio station.)

I suspect I haven't looked hard enough for troubling leakage at 10 MHz from the RG400 I mostly use.  I have the FSJ to fall back on if I take my time nuts hobby to the next level.

Some of the fiber ideas seem promising as well.




Mark Spencer
mark at alignedsolutions.com
604 762 4099

> On Aug 29, 2021, at 10:29 AM, Robert DiRosario <ka3zyx at comcast.net> wrote:
> 
> Andrew Sureflex (FSJ) is a lot more flexible then the LDF4 Healix, which is what you find a
> lot of on ebay and at hamfests.
> 
> Here is some 1/4"  Sureflex, new:
> 
> Andrew Type N Male to Type N Male Sureflex Cable 30 feet F1RNA-PNMNM-30-L1 NEW!
> https://www.ebay.com/itm/173863049072
> US $30.00 + $13.02 Shipping.  For two pieces shipping goes to $16.33, for three $22.90
> 
> You can cut it with a hacksaw, do NOT use wire cutters.  Connectors can be
> installed with just hand tools.
> 
> If you move the test equipment around it's not very practical, but if it's setup on
> a bench or in a rack it will work.
> 
> Robert
> 
> 
> 
>> On 08/29/2021 09:51 AM, Bob kb8tq wrote:
>> Hi
>> 
>> Skin depth is what gets you with most coax at 10 MHz, even with the “double
>> shield” stuff. Hardline with a nice heavy outer would do better. It’s not terribly
>> practical around the typical lab. Might not be a bad choice for a “burry in the yard”
>> setup though. With normal cable, the losses from the soil at normal burial
>> depths make a good shield, that makes dealing with it questionable even there ….
>> 
>> Bob
>> 
>>> On Aug 29, 2021, at 9:36 AM, Robert DiRosario <ka3zyx at comcast.net> wrote:
>>> 
>>> What about double shielded RG-223, or Thinnet ethernet cable?
>>> Most Thinnet has both a braided shield and a foil wrap.
>>> 
>>> Robert
>>> 
>>>> On 08/28/2021 08:26 PM, Bob kb8tq wrote:
>>>> Hi
>>>> 
>>>> Anything you do that has a bunch of 10 MHz cables running out from here or there
>>>> will impact your ability to listen to WWV at 10 MHz :)  Other than killing all the sources,
>>>> there is no silver bullet.
>>>> 
>>>> Bob
>>>> 
>>>>> On Aug 28, 2021, at 7:57 PM, Dana Whitlow <k8yumdoober at gmail.com> wrote:
>>>>> 
>>>>> Bob, my own motivation  for going to fiber was entirely different.  I
>>>>> simply wanted to
>>>>> run 10 MHz all over the place from reference sources in disparate
>>>>> locations in the
>>>>> house, and I quickly discovered that cable leakage was embarrassingly
>>>>> severe.  So
>>>>> I shut down and began contemplating a fiber link.  But then reality set in
>>>>> and I realized
>>>>> that running fiber across the house had its own big problems, so I set the
>>>>> project aside.
>>>>> 
>>>>> Dana
>>>>> 
>>>>> 
>>>>> On Sat, Aug 28, 2021 at 3:3