[1000mp] cw audio loud

[n3drk]

Here are some figures provided by George,w2vjn, the owner of Inrad Filters.

Selectivity: Quartz vs. Silicone

Filter          FT1000MP          Orion          756Pro3          IC7800
2400Hz          3000              2784           3360             3864
500             775               950            985              1850
250             415               750            734              1550

The FT1000MP is the only transceiver which has Inrad Crystal Filters. All 
the others are DSP.

The table shows the measured receiver bandwidth at -60dB for the nominal 
bandwidths under Filter.

The only DSP radio with a bandwidth advantage is the Orion, and only on SSB. 
Now, I know that
selectivity is not the only important parameter for judging a radio, but 
there are some really
big differences in this table, particularly for the CW bandwidths. This 
would surely have an
impact on copying in a crowded band.

There is a lot of hype out there about how great DSP is. Well you can see 
how it compares to
a pair of good crystal filters.The data shown here was obtained from reviews 
in the Radio
Society of Great Britain magazine, Radcom.





----- Original Message ----- 
From: "Scott Manthe" <n9aa at arrl.net>
To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>
Sent: Wednesday, January 25, 2006 5:26 PM
Subject: Re: [1000mp] cw audio loud


> DSP works fine as long as there are suitable roofing filters in front of 
> the DSP filters. The IC-7800 and FT9000 have very robust receivers, as 
> does the Orion. Less expensive or not, these rigs work fine. Of course, if 
> you do not believe DSP to be effective, then you will not like these rigs 
> not matter how good they are.
>
> If the FT-2000 has a robust enough receiver, I will certainly welcome the 
> chance to buy a rig and then not have to buy $600-700.00 worth of filters 
> to make it work properly. We should keep this in mind when V/S announces 
> the price of the new rig, as well.
>
> 73,
> Scott, N9AA
>
> n3drk wrote:
>
>> Art,
>>     Yes you think they would have placed the sidetone control either in 
>> the menu or better yet on the front panel.
>>     I do not expect anything great to come of the ft2000 since it is 
>> going
>> to be dsp. DSP cannot compete with good crystal filters. The Icom 7800 
>> dsp bandwidths in some cases are twice the bandwidth versus the crystal 
>> filters! The manufacturers have created this hype about dsp and really 
>> confused the "public", not us knowledgeable ones who realize this is a 
>> very inexpensive way to cut costs by inserting software instead of 
>> crystals!
>> Looking forward to seeing the specs on the 2000 like you are.
>> 73s
>> john-n3drk
>
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