[Elecraft] softrock with K3

[Don Wilhelm]

Dave,

"simple" and "effective" are often antonyms and do not occur together 
except in the most simple cases.  Assuring that no signals are 
inadvertently injected into the K3 IF OUT jack does not sound like a 
simple case.  Bite the bullet and do a good job of isolating no matter 
what you use - the performance of your K3 depends on it.  Directly 
connecting an $11 piece of equipment to a $1000 piece of equipment and 
expecting no adverse consequences is a lot to be expected.
It *can* be done - the devil is in the details.

73,
Don W3FPR

Dave Martin wrote:
> We'll have to get some ideas for a simple buffer that will provide
> good isolation.  Otherwise before long questions will be popping up
> about spurious responses and noise with our new K3s.
>
>
> On Dec 23, 2007 2:19 PM, Lyle Johnson <kk7p at wavecable.com> wrote:
>   
>>> Any one have any experience with the softrock and the K3...
>>>       
>> PLEASE remember that you *must* have a high-reverse isolation buffer
>> between the K3 IF OUT jack and the Softrock antenna input.  The Softrock
>> may have a huge spur at its carrier frequency and its mixer may not
>> suppress this adequately.  So there is a potential coupling problem
>> (mixer) and radiation problem (shielding).  The IF out of the K3 does
>> not have high reverse isolation characteristics, so you need to ensure
>> you do not couple a signal at the IF *into* the K3 through this connector.
>>
>> 73,
>>
>> Lyle KK7P
>>
>>
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