Posted by
Don Wilhelm-4 on
Jul 10, 2010; 9:24pm
URL: http://elecraft.85.s1.nabble.com/Ameco-PT-3-tp5278625p5278656.html
Warren,
Great to hear that you have had success with the preamp.
However, the sensitivity of a properly working K2 on 15, 12 and 10
meters is sufficient to make a -136 dBm or lower level signal stand out
well above (greater than 3 dB) the internal noise of the K2. I have
measured many, including yours.
Normally the atmospheric noise on those bands is low, especially during
the current (and extended) sunspot low period, and that allows a
preamplifier to be of value.
The other thing to consider is the antenna (and feedline loss). If
there is not an increase in noise (due to the presence of atmospheric
noise) when you connect the antenna to the K2 (or any other radio), then
a preamp will help.
If there *is* a noise increase when the antenna is connected, then
*usually* a preamp will not help - it will make the atmospheric noise
heard in the audio output greater, but that is not a signal - we
normally do not copy signals buried in the atmospheric noise - although
a few ops have excellent ears for doing just that.
73,
Don W3FPR
Warren & Barbara Reese wrote:
> Dear fellow Elecrafters,
>
> I want to report the stunning success the PT-3 has had on the upper
> bands. Especially 15 and 10 meters. I have long held the suspicion
> that the K2 is deficient in sensitivity on these bands and the PT-3
> confirms it in spades. Stations that are indecipherable now stand
> out clearly in arm chair copy.
>
> Let me recommend to others to try the PT-3 !
>
> BTW, my K2 has been back to both Gary and Don and has been checked on
> the higher bands for sensitivity. It has returned both times with a
> testimonial as to it's being OK.
>
> TR, K6GC, the Great Circle Station
> in the State of Jefferson.
>
http://www.ijpr.org/Page.asp?NavID=1033>
> K2/100/KAT S/N 838, Updated with all the new mods.
>
>
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