[R-390] Filters

[Scott Overstreet]

Bob---
Can you put it all in a box that would fit in place of the mechanical 
filters and run on available power within that sub assembly?

Scott






--- Original Message ----- 
From: "Bob Camp" <ham at kb8tq.com>
To: <r-390 at mailman.qth.net>
Sent: Friday, February 15, 2013 6:35 PM
Subject: Re: [R-390] Filters


> Hi
>
> With the right hardware to target and good design software, the filters 
> are a weekend project code. From scratch the design software stuff likely 
> would run you < $500.
>
> Bob
>
>
> On Feb 15, 2013, at 9:22 PM, mlmccauley at att.net wrote:
>
>>
>> Absolutely.
>>
>> I've seen those come and go. The concept is great, but the market is very 
>> limited, hence the cost.
>>
>> A savvy ham with the proper background could homebrew a very nice filter 
>> for a relatively cheap price. Soldering the hardware together would be a 
>> fairly easy weekend project, assuming you had a surface mount adapter 
>> board for the DSP chip. The software would take many weeks to write and 
>> even longer to debug.
>>
>>
>> On 2/15/2013 8:05 PM, Bob Camp wrote:
>>> Hi
>>>
>>> Thus the variety of outboard dsp filter boxes that have shown up over 
>>> the years. Once you get them into production, the cost is high enough 
>>> that there is a very limited audience.
>>>
>>> Bob
>>>
>>> On Feb 15, 2013, at 8:50 PM, mlmccauley at att.net wrote:
>>>
>>>> A DSP filter would be an ideal replacement for a mechanical.
>>>>
>>>> DSP chips that work at 455KHz are readily available for very reasonable 
>>>> $.
>>>>
>>>> The problem is the software.  To do a nice, flat topped, steep skirt 
>>>> filter would not be a trivial piece of work.
>>>>
>>>> The upside is that one relatively simple circuit could be made to do 
>>>> everything from super-narrow CW to full bandwidth AM SWL.
>>>>
>>>> 73,
>>>>
>>>> Mike, WB5MYY
>>>>
>>>>
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>
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