[1000mp] FT-1000 with Heil PR-40

[Jim Smith]

Depends what you mean by "normal" SSB purposes.

Several decades ago I was a designer of telephone carrier systems.  In 
one system I worked on, each channel had a 250 Hz low pass filter and a 
3400 Hz high pass filter at the transmit end.  This system was designed 
to be "toll quality" which means that it would satisfy the end to end 
requirements of the long distance telephone system.  So, 3150 Hz 
bandwidth for a telecommunications channel which sounded "natural". 
With guard bands, each channel was allocated a 4 kHz chunk of the spectrum.

There was also a requirement to pass "program material".  i.e. 
commercial AM/FM radio broadcasts.  We had a way of using 2 channels for 
this.  So a program channel, including guard bands, was allocated a max 
of 8 kHz.

It is not obvious to me what normal ham radio SSB purpose would require 
a bandwidth almost 6X greater than a good quality international 
telephone circuit and 10X greater than the bandwidth I routinely use 
when trying to communicate under difficult conditions.

In any event, I would expect that the transmit filters in any ham SSB 
rig would have bandwidths far lower than that of the proposed microphone 
so, if it costs more than a mic with a more restricted bandwidth, you're 
spending money which could be put to a better use.

73, Jim	VE7FO

Hans Remeeus wrote:
> Hello,
> 
> 
> The audio response of the PR-40 is 28 till 18,000 Hz. Would this be a 
> bit too wide for normal SSB purposes?
> 
> Many thanks in advance!
> 
>