[Amps] PIN diode mods

[Jan Erik Holm]

On my FT-1000D I can measure a substantial difference
replaceing the stock 1SS83 diodes with BA479 diodes.

Sure I do agree with a lot of your reasoning below
however I do think you are generalizing far too much.

If voodoo sience both me and Yaesu enineers are subject
to it, Yaseu has assigned a service bulletin on the
subject,  however being a enineer myself I must beleive
in my own measurements.

Sometimes we find a workaround to the specific problem
instead of attacking the problem itself, the workaround
might be easier to do, this with current thru diodes
and carrier liftime in mind.

73 Jim SM2EKM

PS: And no "I´m not using one generator", I do know how
to measure IMDDR3.
---------------------------------------------------------



Tom W8JI wrote:
>>It's the same as swapping switching diodes in transceivers 
>>to pin-diodes
>>without checking/correcting their current.
>>Thousands did.
>>Every day another fool awakes, one just hast to find 
>>him...
> 
> 
> You know Peter, that is a good example of voodoo 
> pathological science.
> 
> I spent quite a bit of time investigating PIN diodes vs. 
> regular diodes in my rigs and found absolutely no difference 
> at all. Yet people who do the mods will swear they work.
> 
> Look at Sherwood Engineering's site at a PIN modified ICOM 
> 781. Click here and find the "Sherwood's tests" link at the 
> page top:
> http://www.w8ji.com/receivers.htm
> 
> The modified 781 is 6dB worse for close spaced IM3.
> 
> The best any of my tests did on a couple FT1000's was break 
> even, yet people swear it makes a huge difference.
> 
> Amplifiers are no different.
> 
> 73 Tom 
>