[AMRadio] Source Broadcast Xmtrs

[John Tate]

Most FM I have heard on 2 meter and 29Mhz cannot touch the fidelity of plate modulated AM. BTW, do you tell SSB folks that they should limit their bandwidth to 1.8 Khz? Because 1.8Khz is all that is necessary for the "inforamation rate and emission type" of SSB. The part that says "in accordance with good amateur pratice" is somewhat subjective but it is known that good amateur practice among the A.M. operators is "pleasing armchair ragchew fidelity". Good amateur practice also means if the band is crowded to tighten up the bandwidth but if it is not crowded to allow for a more pleasing fidelity that does not fatigue the listener.


 Do you even run A.M. at all Ron? You seem to have a vendetta against the mode for some reason. 


 73, John KX5JT AMI# 1684


----- Original Message -----
From: Ron Youvan
Sent: 06/11/11 08:26 PM
To: amradio
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. ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio at mailman.qth.net To unsubscribe, send an email to amradio-request at mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html