[ICOM] Fw: Filtering IC 775 DSP

[Edward Dickinson, III]

Anders,

Thanks for your interesting comment on unsymetrical filter bandwidth.  I
have noticed the USB/LSB difference in my stock (filter-wise) IC-751A.  I
had assumed it to be some internal adjustment. 

73 de Dick - KA5KKT

-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of Anders Janis SM4RNA
Sent: Tuesday, June 27, 2006 12:20 PM
To: ICOM Reflector
Subject: Re: [ICOM] Fw: Filtering IC 775 DSP

The advantage of Inrad is that I have found, is that Inrad filters are
symetrical. That mean that with Inrad filters re radio sound the same in USB
and LSB. ICOM filters is often unsymetrical and that can be noted that the
recived noice sound different in USB and LSB and that mean that the bandwith
is not the same in LSB and USB. My 1,8kHz ICOM filter is much more narrow on
USB. You can make the radio to sound the same on USB and LSB by adjusting
the PBT, but you will get a different setting for each filter.

What bandwith you need greatly depend up on the caracteristic the
transmitted audio that you receive. Your own prefrenses is also very
important.

It is up to yourself if the filter is to narrow or not. A friend can not
tell you what to think.

de Anders SM4RNA


----- Original Message -----
From: "Anders Janis SM4RNA" <sm4rna at telia.com>
To: "ICOM Reflector" <icom at mailman.qth.net>
Sent: Tuesday, June 27, 2006 5:59 PM
Subject: [ICOM] Fw: Filtering IC 775 DSP


> Forwarded upon request:
>
>
>> ----------------
>> Hello from Poland,
>>
>> I have all optional filters installed in my IC 775 DXII, except the 
>> narrow
>> SSB filter in @455khz slot.
>>
>> Some people suggested me to install INRAD 2,1 khz  filter instead of
>> original FL 222 1,9Khz, saying that the original sounds too narrow and 
>> it's
>> useless in fact.
>>
>> Will be grateful for any advice, maybe someone have already tried both
>> options...
>> How about Inrad 1,8 khz filter?
>>
>> 73 de Mac SP2XF
>>
>
> ----
> Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/ 

----
Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
Icom Users Net: Sundays, 1700Z, 14.316 MHz
Icom FAQ: http://www.qsl.net/icom/