[Elecraft] KPA500 mobile?

[Matt Zilmer]

Sirius (at least) has terrestrial transmitters that are used to full sat 
voids, like tunnels or parts of the San Francisco or NY financial 
districts, or tall mountains near an interstate highway.  The smaller 
blockages are probably deemed a minor inconvenience, especially if 
they're out inthe countrysideor in unpopulated areas.  I used Sirius in 
the early 2000s, and used to experience regular dropouts of 4 seconds in 
several locations on my commuteto/from work.  Each of these areas was 
under a highway or freeway.

Not sure if your tunnel was private or not.  If it was, it wasn't 
covered by surface transmitters unless by accident.  There is a tunnel 
in LA that basically runs under LAX, and I never lost signal there. It's 
probably hit or miss on what's covered terrestrially.

XM (I believe) bought Sirius out, sometime in the last decade. Both 
services operate on the abandoned telco S-bandif I understand 
correctly.  I hear XM isn't doing so well financially, but that was 
probably a couple of years ago.  May not be current on this.

73,

matt W6NIA


On 4/14/2017 8:47 PM, Fred Jensen wrote:
> Semi-related curiosity regarding shielding.  My wife's car has 
> Sirius/XM radio.  It usually loses contact with the satellite driving 
> under Interstate bridges and the like.  Likewise in the garage.  OTOH, 
> at our previous home there was a tunnel through a small hill, perhaps 
> 1/4 mi long.  The XM worked fine through it. There are a pair of 
> tunnels at Cave Rock next to Lake Tahoe through a granite mountain.  
> XM works fine through them too.  Anyone know why?
>
> 73,
>
> Fred ("Skip") K6DGW
> Sparks NV USA
> Washoe County DM09dn
>
> On 4/14/2017 2:50 PM, Phil Kane wrote:
>> On 4/14/2017 1:13 PM, KENT TRIMBLE wrote:
>>
>>> The assumption has always been that the driver and passengers are 
>>> riding
>>> inside a Faraday Cage and therefore are safe from RF radiated by an HF
>>> antenna, regardless of where located and regardless of power level.
>> When I take my 2011 Ford Focus through the car wash, I put the mag-mount
>> VHF antenna inside the car but it is still connected to the radio.  I
>> have no problem picking up the usual 2- and 3/4- meter repeaters that
>> way.  So much for the "Faraday Cage".  :)
>>
>> 73 de K2ASP - Phil Kane
>> Elecraft K2/100   s/n 5402
>>
>
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-- 
"A delay is better than a disaster."
-- unknonwn

Matt Zilmer, W6NIA
[Shiraz]