[Heathkit] TVI (was Running the HX-10 Marauder outside its cabinet)

[LeeCraner at aol.com]

Great story, Bob. 
 
Our cable company came out last week and redid their cabling.  I was  very 
impressed with the quality of cable, and connectors, that they used.   I 
suspect that between HDTV and higher broadband Internet, they're finding  
better cabling is cheaper in the long run.
 
73
Lee WB6SSW
 
 
In a message dated 11/11/2011 12:30:06 P.M. Pacific Standard Time,  
rbethman at comcast.net writes:

That is  also true.

However, when I am running AM, as I was at the time with a  BC-610, I did 
NOT get into my own.

This person's portable phone was  apparently some cheap "Chinese" garbage.

It has been a VERY long time,  but I blanked out the neighborhood cable 
TV system.  This goes back  to the first year I was licensed.  What made 
it even more weird, was  that my OWN TV located less than six feet away, 
was NOT  affected!

It happened to be a quirk caused by the Cable company  replacing the drop 
to my QTH with cable that had a total of three drain  wires for ground.

I went through everything I could.  Then I  called and asked to speak 
with their Chief Engineer.

He and a team  came out to my house.  They sniffed the shack,, and then 
the Chief  went up in a bucket to the distribution amp on the pole.

He had me once  again light up.  While he was taking readings, he 
disconnected MY  drop.  All the signal went away.

It turns out that they had put in  that garbage cable, managed to 
parallel one half of MY dipole.  The  Chief took out a pocket knife, 
sliced off the jacket of my drop.  He  immediately had a rapid discussion 
with his team, and sent them scurrying  to get some REAL shielded cable 
on site IMMEDIATELY!

All the  problems went away.

Bob - N0DGN

On 11/11/2011 3:10 PM, Ross  Stenberg wrote:
> Amplified computer speakers can also be a  culprit.
>
> On 11/11/2011 1:56 PM, rbethman wrote:
>> It  is true that TVI isn't an issue in reality.
>>
>> The  Mohawk, Apache, and Marauder all used the same cabinet.  The  Apache
>> and Marauder have shielded enclosures for the  PA.
>>
>> I don't know if the DX-100 cabinet is the same or  not.
>>
>> However, I suspect that the rack would perform  adequate RFI enclosure 
duty.
>>
>> The only issues I have  run across regarding RFI in the last number of
>> years has been ONE  squawk from someone in the neighborhood that happened
>> to hear me  through their portable telephone.
>>
>> I pointed out that  it was subject to Part 15, and therefore 
interference.
>>
>>  That ceased the grumbling.
>>
>> Bob -  N0DGN
>>
>> On 11/11/2011 2:47 PM, Ross Stenberg  wrote:
>>> For what it's worth, TVI is a rare thing since analog  TV has gone away
>>> and everything is digital mainly in the UHF  region. The lower frequency
>>> TV channels basically do not exist  anymore.
>>>
>>> On 11/11/2011 12:24 PM, Rick Poole  wrote:
>>>> Good  afternoon...
>>>>
>>>> Just wondering if it is  safe, from a TVI / RFI perspective, to run
>>>> the Heath HX-10  Marauder outside of its cabinet.  I want to
>>>>  rack-mount it in a standard 19" rack, and of course can't do that  if
>>>> it's in its  cabinet.
>>>>
>>>> The DX-100B (at least, the  one I have) doesn't have any internal
>>>> shielding and so the  cabinet is an integral part of the shield, so
>>>> running it  outside the cabinet is likely to result in some seriously
>>>>  irritated neighbors.  It appears, though, that the final  amplifier
>>>> section of the HX-10 is completely enclosed in  its own shield and so
>>>> perhaps I can get away with  it.
>>>>
>>>> Of course, the mounting holes on  the sides of the Marauder panel
>>>> don't match up with a  standard rack (why, oh WHY did they do that???)
>>>> but I  guess that's nothing that a power drill and 10-32 tap (for  the
>>>> rack, not for the Marauder panel) can't  fix.
>>>>
>>>> Rick  WA1RKT
>>>>
>>>>
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--  
+------------------------------------------------------------------+
|   AM Amateur Radio  Operator    NØDGN                |
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|    http://home.comcast.net/~rbethman/              |
+------------------------------------------------------------------+
|  Bob Bethman                 \\\|///     " The absence of a danger |
|      \\ ~ ~ //      signal does *NOT* mean  |
|  rbethman at comcast.net      (/ @ @ /)      that  everything is OK "  |
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