[Elecraft] A little more =-"ooomph"

Mon Feb 9 17:34:00 2004

Agreed!  The little 35-40 watt amp does wonders for the K1 
when things get rough!  I usually run my K1 at 3.5-5 watts out
depending on where I am and what battery pack I have in use.
The gain from 5 to 35-40 watts is quite substatial when the 
band gets crowded or you are trying to nab that DX station when
the 5 watts doesn't cut it.  
It's been a nice set of shoes for the K1 for sure.
73,
Sandy W5TVW
----- Original Message ----- 
From: "Ron D'Eau Claire" <[email protected]>
To: <[email protected]>
Sent: Monday, February 09, 2004 3:34 PM
Subject: RE: [Elecraft] A little more =-"ooomph"

| I sure don't want to start the old QRO/QRP debate again, but one reason why
| there aren't more 25 to 35 watt amps around for a rig in the QRP K2's power
| range is that the difference between 10 or 15 watts and 30 watts or so is
| somewhere between 1/2 and 1 S-unit on most receivers. That is, it's not
| enough to detect on normal 'on-air' operations. It's usually very hard to
| detect even if you are in a position to quickly switch back and forth
| between the two power levels. It's very rarely, if ever, enough to make a
| difference in normal QSO's.
| 
| The difference between 10 and 25 watts is not even HALF an S-unit. 
| 
| Normally, it takes a two or more S-unit change to make difference that is
| apparent on the bands. That's why most rigs go up in power in 10:1 steps
| (e.g. 10 dB or 1.5 S-Units). So 10 watts goes to 100 watts - the KPA100. And
| if you want that sort of difference again, you need to step up to 1000 watts
| output. 
| 
| That's why you'll find that many of the 25 to 35 watt output amp circuits
| are designed for a watt or two of drive. They do a credible job of boosting
| a 2 or 3 watt rig in a way that is apparent on the air, just as the KPA100
| takes a 10 watt K2 to 100 watts output. 
| 
| Ron AC7AC
| 
| 
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