[Elecraft] Trade off PR6 vs PR6-10 pre-amp

[Joe Subich, W4TV]

For all practical purposes, the differences between the PR6 and PR6-10
   PR6     NF= 0.5 dB typ, gain= 18 dB
   PR6-10  NF< 0.7 dB,     gain= 20 dB
should be indistinguishable.  In the worst conditions of in-band QRM
the PR6-10 may result in up to 4 dB poorer IMD3 but both interfering
signals would need to be within 2 KHz of the operating frequency for
that to be significant.  With either preamp, system noise figure (net
of feedline losses) should be less than 1 dB.

Out of band noise (and blocking) should be handled by the receiver
bandpass filters regardless of the preamp selected.  Sherwood reports
the K3's 100 KHz blocking dynamic range at 140 dB - not likely to be
significantly impacted by an extra 2 dB of preamp gain.

73,

    ... Joe, W4TV


On 7/12/2013 12:26 PM, W0FK wrote:
> John, did anyone reply to your questions? Have you made a decision? I am also
> wondering if making making the switch will compromise 6M performance.
>
> 73,
>
> Lou, W0FK
>
>
> KH7T wrote
>> I have the PR6 mounted on the K3.  Did successful JT65 6M moon bounce
>> with 11 element antenna,1000 watts, 110 foot BuryFlex coax, and
>> appropriate switching.  So this setup worked.
>>
>> I note that the specification for the PR6-10 has about 2dB more gain
>> than the PR6.  The MDS and dynamic range specs are the same.
>>
>> Would the 6 meter performance with the K3 using the PR6-10 be better or
>> worse than the PR6 because of:
>>
>> 1. Wider pass band?  More opportunity for out of band noise?
>>
>> 2. More gain?  Impact on overall dynamic range and noise figure?
>>
>> My real question is should I sell my PR6 and get a PR6-10?  I do not
>> want to lose anything on 6 meters but perhaps could stand some
>> improvement on 10.
>>
>> Aloha,
>> John KH7T, Unrepentant Engineer
>>
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> -----
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