[AMRadio] Source Broadcast Xmtrs

[Bernie Doran]

The answer to that question is yes,and I do. if you look at the frequencies 
in a male voice you will find that it jumps out to at least 7kc frequently. 
Most notable c and s sounds do.   I have no interest in communication 
quality. in simply sounds terrible and if one thinks not look/ listen  to an 
AM broadcast signal on a wide receiver with good audio and then cut it to 
2.1 KC and listen.   If one is concerned with bandwidth and communication 
quality why are you not running CW or PSK.     regarding frequency response, 
I have the original installation manual and proof of performance tests that 
were run after installation for my Gates. It reads like the highest 
performance audio amps from the 50s and 60s. response from 30 cycles to 15 
KC and the range from 300 to 10KC is about +or_ 1 DB and less than 1 % 
distortion.   That quality is certainly one reason, if not the main reason, 
for running AM and after being back on for several years now, I find that 
using SSB is simply more and more unsatisfactory.   My preamp is set to 
start to roll off at 5 KC.       I recall someone once said "how many times 
do you use phonetics when speaking to someone face to face"?      I usually 
operate on the lower portion of 80 around 3.7 + or - 30 KC  and if I can 
find find a clear 10 KC I do not get on.    Original Message ----- 
From: "Ron Youvan" <ka4inm at tampabay.rr.com>
To: "amradio" <amradio at mailman.qth.net>
Sent: Saturday, June 11, 2011 9:26 PM
Subject: Re: [AMRadio] Source Broadcast Xmtrs


> Bernie Doran wrote:
>
>> " big iron limits the fidelity in ways that a rice box doesn't" what an 
>> interesting view, rice
>> boxes cut off the lows and also cut off the mid and highs 300 to 2100 
>> seems typical, so I guess
>> if the definition of fidelity is 300 to 2100 then perhaps the big iron 
>> does limit fidelity. of
>> course now someone will chip up and say we can only use 3 kc bandwidth, 
>> or that we need to
>> conserve bandwidth, does it wear out after a period of time?
>
>   No, would you like to have your audio bandwidth out to 5 kc?  Have a 
> signal 10 kc wide? *
> even with the rule:
> <
> Part 97 : Sec. 97.307 Emission standards
> (a) No amateur station transmission shall occupy more bandwidth than 
> necessary for the information
> rate and emission type being transmitted, in accordance with good amateur 
> practice.
> >
>   If you want REAL fidelity, try FM, see you on 29+ MHz.  (or 2 meters)
>
> * if the next CARRIER (QSO) is 5 kc away the two sidebands will over lap 
> and you will hear each
> others AND there will be a constant 5 kc tone while OM talks.  To avoid 
> this you will have to stay
> 10 kc from me and IF your receiver has wide bandwidth there will be a 10 
> kc whistle, which is why
> rice boxes usually have a 6 kc AM bandwidth
> -- 
>    Ron  KA4INM - You can't fool me ...
>                       ... I'm a moron.
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