Do we run into the FCC external amplifier 15 dB gain limit here?
73 de dave
ab9ca/4
On 7/26/15 7:51 PM, Joe Subich, W4TV wrote:
Don,
WSPR, JT65 and JT9 are (1 of N tone) FSK modes. They are no
different than conventional AFSK (1 of 2) in that the tones
are continuous phase, constant amplitude and can be amplified
by a class C amplifier without generating undue IMD or clicks.
I haven't seen the details of WSQ yet - if it is a multiple
simultaneous tone mode it would require a linear amplifier -
but the other listed "sound card" modes are fine with an
amplifier that operates in class C (or even a switch mode
amplifier so long as the bandpass filter is sufficient).
73,
... Joe, W4TV
On 2015-07-26 8:32 PM, Don Wilhelm wrote:
Tom,
Soundcard sourced digital modes are really SSB signals and need a
linear
amplifier.
73,
Don W3FPR
On 7/26/2015 8:25 PM, Tom Azlin W7SUA wrote:
Hi Ed.
I am more interested in a non-linear class C or higher amp for those
bands as was not thinking to run modes that need a linear amp. WSPR, a
WSJT mode, WSQ, and the like.
73, tom w7sua
Chino Valley AZ
On 7/26/2015 1:23 PM, Edward R Cole wrote:
With the recent expansion of use to 630m for the K3s and upgraded K3
which only transmit at nom 1mw, a question arises:
Is there interest in a linear amplifier taking 1mw drive to produce
either 25w or 100w?
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