[Elecraft] Elecraft Digest, Vol 201, Issue 14

[Gordon LaPoint]

I have 2 KRC2's, one at home and one at my remote.  Both have operated 
flawlessly, including lots of 500 Watts RTTY contests.  I have found 
that if I'm going to have RFI problems it always shows up first when 
using 500 watts rtty.
One of the KRC2's is hooked to the aux bus from a K3, the other is 
hooked to the RS-232 port on a Kenwood TS-590sg, both driving an 
Elecraft KPA500 amp.
Gordon - N1MGO


On 1/12/2021 7:00 AM, Victor Rosenthal wrote:
> I brought all the connections to the relays the KRC2 operates and its 
> power supply in via a piece of multiconductor cable, wrapped 10 turns 
> of it around a #31 toroid and I have since had no problems with 1200 
> watts to an antenna about 4m above my roof. No special treatment was 
> need for the connection to the K3.
>
>
> I may have scraped paint off the enclosure near the screws that hold 
> the case together when I assembled it. I do that a lot.  A Dremel 
> grinder does a neat job quickly.
>
> 73,
> Victor, 4X6GP
> Rehovot, Israel
> CWops #5
> Formerly K2VCO
> https://www.qsl.net/k2vco/
>
> On 12/01/2021 5:04, Jim Brown wrote:
>> On 1/11/2021 6:29 PM, HP wrote:
>>> Tom - I will give you some unsolicited advice-- The KRC2 was the 
>>> worst RFI sucking piece of gear I ever owned.
>>
>> Simple reason -- it's chock full of Pin One Problems and is 
>> unshielded. Oh, you say, it's a metal chassis. Yes, BUT -- all the 
>> connectors are insulated from the chassis by paint, there's no 
>> connection between pieces of the chassis because junctions are 
>> painted, and so on. Shielding only works if it's continuous, and if 
>> cable shields are bonded to the shielding enclosure at point of entry.
>>
>> One of the members of our CQP team bought two for W6GJB's contesting 
>> trailer to go along with the W3NQN filters and switch box he also 
>> bought. I spent a several hours scraping paint, making sure all the 
>> cable shields hit the chassis at point of entry, and so on.
>>
>> One good thing I learned about it -- a single coax between the Aux 
>> Buss and chassis of the K3 and the KRC2 is all it takes for band 
>> decoding. No RFI issues with K3/KPA500/KAT500 to antennas within 50 
>> ft of the operating position.
>>
>> 73, Jim K9YC
>>
>>
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