The actual change enables alc action--you could do without that I suppose
but it wouldn't be smart. Requires adding a turn to the output detector
transformer, removing a jumper, reconnecting a cable, removing 2 wires,
if I remember right.
Ralph Matheny
K8RYU
207 Gibbons Place
Marietta Ohio 45750
mathenyr@marietta.edu
Remember: Ohio QSO party August 25. Details at OQP.US
On Fri, 13 Jul 2007, Kevin Anderson wrote:
> Stuart wrote:
>
>> In interesting fact is you can remove one 12 volt wire,
>> and swap one coax jumper, and make a Scout into a 556, 5 watt
>> radio, very quickly. The 5 watt 556 was just a Scout running
>> with only a driver transistor and no two transistor final.
> The
>> same modules provide the Band Pass filtering for the output
>> signal.
>
> I have both a 555 and 556. While what you say is true, there is
> actually a production difference between the two radios. I
> can't remember which board specifically (I'm at work and the
> radios and manuals are at home), but the 556 actually has a
> different board in it to make it a true 556. The primary change
> on that board is in changing the meter so it reads full scale on
> 5 watts (i.e., 50 on the meter equals 5 watts).
>
> While I like the 556 I have, and will keep it, the one negative
> that I can see when compared to the 555 is that without the
> finals of the 555, the driver transistor of the 556, now the
> final, has less protection. When it fails, the entire radio
> will fail. In return for this loss of protection, the power
> consumption of the 556 at full power is considerably less than a
> 555 turned down to 5 watts.
>
> Cheers/73,
> Kevin, K9IUA
>
>
> --
> -------------------------------------
> Kevin Anderson, Dubuque IA USA, K9IUA
> k9iua (at) yahoo (dot) com
> http://postoilgeography.blogspot.com/
> -------------------------------------
>
>
>
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