[ICOM] Icom 7200 at Dayton Big Disappointment???

[Anders Janis SM4RNA]

Theoreticaly yes, but some can be and is "left out". Acctually FM has a what 
you can call unlimited bandwith but by a condition when the sidebands 
contain less power than a choosen value the bandwith is "decided". I have 
also read transform theory and microwave theory among other things even if I 
seem to forgot some of the mathematics.

Also the bandwiths noted is at -6dB not and -60dB or band stop. Often 
filters are specified as MORE than xxx kHz at -6dB and LESS than yyy kHz 
at -60dB. Most radios with +- 2,5kHz devaiton has 6 or 8kHz at -6dB filters.

The DR-03T has a 8kHz and I belive the IC-2200H also use 8Khz in narrow 
mode. Almost all 10m tranceivers like the RCI, President Lincoln and so has 
Murata 6kHz filters togheter with +- 2.5 kHz deviation.

de Anders


----- Original Message ----- 
From: "D C *Mac* Macdonald" <k2gkk at hotmail.com>
To: "ICOM Reflector" <icom at mailman.qth.net>
Sent: Thursday, May 22, 2008 4:11 AM
Subject: RE: [ICOM] Icom 7200 at Dayton Big Disappointment???



Again, if my memory hasn't failed me since I studied this
stuff, +/- 2.5 kHz deviation would require a bandwidth of
11 kHz and +/- 3 kHz deviation would require 12 kHz.
Both of these would be too wide to be well accommodated
through a 6 kHz roofing filter without serious distortion.

73 - Mac, K2GKK/5
Oklahoma City, OK



> From: sm4rna at telia.com
> To: icom at mailman.qth.net
> Subject: Re: [ICOM] Icom 7200 at Dayton Big Disappointment???
> Date: Thu, 22 May 2008 03:51:05 +0200
>
> Yes, but on 10m -+2,5kHz should be used, and is on i.e. the DR-03T
> (http://www.alinco.com/Products/DR-03_06/) and the FT-8900. Older radios
> like the IC-735 or IC-725 is to wide both in RX and TX.
>
> de Anders
>
>
> ----- Original Message ----- 
> From: "D C *Mac* Macdonald"
> To: "ICOM Reflector"
> Sent: Thursday, May 22, 2008 3:19 AM
> Subject: RE: [ICOM] Icom 7200 at Dayton Big Disappointment???
>
>
>
> 5 khZ (+/-) deviation requires a 16 kHz bandwidth,
> if I remember correctly, due to the sidebands that
> are generated out beyond the expected 10 kHz
> bandwidth.
>
> 73 - Mac, K2GKK/5
> Oklahoma City, OK
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