[Elecraft] Bad Ham Radio Day

[Fred Jensen]

Jerry:  Make sure your amp "lid" is securely bonded to the base K2.  I 
have an early K2 and had the same kind of symptoms as you did when I 
added the amp lid.  I finally traced it to significant paint over spray 
on the K2 side panels.  I ended up sanding them clean and the problem 
disappeared.

And, just in case you haven't already discovered it, those two little 
2-pin Molex connectors [PWR and RF IN] are readily interchangeable and 
the leads are long enough to do that.  They are however most assuredly 
*_NOT_* interchangeable electrically.  You can likely guess how I know 
this. 😉

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 9/4/2021 2:48 PM, jerry wrote:
> On 2021-09-04 14:31, Jim Brown wrote:
>> On 9/4/2021 2:03 PM, jerry wrote:
>>> I made up a short length of RG8/U with 4 Palomar 31-mix giant 
>>> ferrite beads
>>
>> Palomar SELLS these cores, at high prices. Fair-Rite MAKES them.
>
> 31-mix is supposed to be the hot ticket for HF common mode
> chokes.  One turn through one core is supposed to be 98 ohms at 5MHz.  
> So four cores should give me about 400 ohms, which should give a 
> worthwhile attenuation in a 50 ohm system.  Thanks for the references.
>
>   It's interesting that I am not having any such problems with any
> other equipment.  My TS590S works fine.  So did the K2/10 with my tiny 
> linear.
> And a QRP-labs transceiver.  And a uBITX transceiver.  And a ICOM 
> IC706MKII.
> None of this stuff is doing anything strange.
>
>                      - Jerry KF6VB
>
>
>
>>
>>  - a common mode choke.  No difference.
>>
>> This is only a good choke at VHF. If your problem is HF, multiple
>> turns must be wound through the core. Study choke recommendations
>> here.
>>
>> http://k9yc.com/KillingReceiveNoise.pdf
>>
>> And here. http://k9yc.com/RFI-Ham.pdf
>>
>> 73, Jim K9YC