[Yaesu] Mechanical vs. Crystal filters

[Anders Janis SM4RNA]

Please correct me if my "harddrive" has a malfunction. ;)

I think I remember seeing a picture of the interior of a INRAD filter and I 
think it has one or two adjusteble inductors. When I opened up a ICOM x-tal 
filter only fixed components was found. If I this is correct it may explain 
that the INRAD filters always sound the same on USB as on LSB as they are 
adjusted for the correct center QRG.

de Anders SM4RNA




----- Original Message ----- 
From: "Hans Remeeus" <hans at remeeus.nl>
To: <yaesu at mailman.qth.net>
Sent: Wednesday, August 16, 2006 7:28 PM
Subject: Re: [Yaesu] Mechanical vs. Crystal filters


> The marketing of Collins filters is excellent.
>
> The performance of e.g. Inrad chrystal filters is even better...
>
>
> 73,
> Hans Remeeus (PA1HR)
> http://www.remeeus.eu
> Communication is about people, the rest is technology.
>
>
>
> John Tait schreef:
>>
>>
>> John Geiger wrote:
>>> Is there any reason why Yaesu has been using
>>> mechanical filters in many of their latest
>>> transceivers?  Aren't crystal filters better-even
>>> though the mechanical filters have the "Collins" name
>>> on them?
>>>
>>> 73s John W5TD
>>>
>> The "Collins" tag is a bit of a misnomer really. They're just cashing in 
>> on the historical reputation for excellence that Collins had when they 
>> were in business. A mechanical filter is a good bit better than a ceramic 
>> filter, but NOT as good as a crystal filter.
>> Vy 73
>>     John EI7BA
>>
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