[TenTec] Preselectors for SDR

[Gary F]

Sherwood ranks the preselector in the Drake slightly poorer than the on in the R-390, which is the only radio getting an A+ rating in this regard. I think his rating is an accurate one.
The R-4C preselector was certainly far better than none but did not have as many tuned stages as the one in the 390 had.

How about an SDR with an R-390 preselector in front of it!?!?
A stepper motor connected to the mN shaft, coupled to a computer based lookup table to drive it based on the selected operating frequency would sure have some appeal. One could even install the SDR inside the R-390 case since the SDR's are so ugly anyway...

Gary 

W0DVN

Sent from my iPad

> On Sep 17, 2016, at 9:55 AM, Chris Howard w0ep <w0ep at w0ep.us> wrote:
> 
> 
> Just for comparison,
> what is the relative performance of the preselector in a Drake R4B or R4C?
> 
> 
> 
>> On 9/17/2016 7:34 AM, Jim M. via TenTec wrote:
>> The engineers at Collins knew the value and need for good receiver Preselectors when they designed the R-390 family in the 50's and 60's. A bank of tuned circuits mechanically track received frequency via mechanical gears and cams. Still one of the best performing HF receivers around. 
>> 
>> Jim N4BE
>> 
>> Sent from my iPad
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