Fw: [Yaesu] 2.8kHz Collins filter for the FT-900 for $50.00???

Tue, 12 Feb 2002 17:23:27 -0500

----- Original Message -----
From: "AES" <[email protected]>
To: "Wilson A. Caselli" <[email protected]>
Sent: Tuesday, February 12, 2002 3:03 PM
Subject: Re: [Yaesu] 2.8kHz Collins filter for the FT-900 for $50.00???

The filter that he is talking about is the YF115S01.  These are no longer
available from AES.

*********** REPLY SEPARATOR  ***********

On 2/11/2002 at 8:41 PM Wilson A. Caselli wrote:

>Gents:
>
>Can you identify the Yaesu part number of the Collins filter mentioned
>below?
>
>Let me know if you can supply one.
>
>Thanks,
>
>Wilson A. Caselli, K1MIJ
>12104 Oakhaven Drive
>Charlotte, NC 28273-3652
>
>(704) 588-2944
>
>[email protected]
>
>---------------------------------------------------------------------------
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>----
>----- Original Message -----
>From: "John Bolduc" <[email protected]>
>To: <[email protected]>
>Sent: Monday, February 11, 2002 7:48 PM
>Subject: Re: [Yaesu] Re: Pin Diodes FT-990
>
>
>> Stuart
>>      I made a temporary fix to my 990. Here's what I did..... First of
all
>> the hiss is from the 455 stage .. From the Murata 455 filter to the
>product
>> detector . The audio amps are very quiet , and are not the problem. Some
>rig
>> have noisy audio amp like the 1000MP,  it uses the old TDA2002 chip(very
>> common part) & the 990 uses the new TDA2003 much better!!
>>
>> Ok back to it... I took out that crappy Murata filter & replaced it with
a
>> Collins 2.8khz This is the same filter the 1000MP uses. And AES had them
>on
>> Closeout for $50.00 . But they're label for the FT-900 . Same filter
>mounted
>> on a different board, You don't need the board. Put it in the 990 with
>patch
>> cable's.
>>
>> The big advantage of this filter other than it's superior to the Murata
in
>> every way is ...... It has way less insertion loss so the input into the
>> first bipolar transistor is higher , So now you can go to the IF gain pot
>> located down stream in the circuit and turn it down. You still have the
>same
>> receiver sensitivity but the hiss is lower..... This is the same
principle
>> that Inrad use's with the 1000MP mod they sell except the use an active
>amp
>> in the 70 meg IF .......And turn the IF gain down in the service menu .
>> This works well for a simple mod ... But the best way would be to use FET
>'s
>> in the 455 IF They have much less noise. My 940 Kenwood use's those and
is
>> Way quieter than the 990.  But would be major surgery ..... I'm happy
with
>> this simple update plus the IF shift work's better because of the Collins
>> great skirts & the audio is better too , because of less filter ripple &
>> overall receiver with is wider .........
>>
>> 73's john
>>
>>
>> _______________________________________________
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>> [email protected]
>> http://mailman.qth.net/mailman/listinfo/yaesu
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>>
>>
>
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Thank you for contacting AES. We hope we can assist you in the future.
73
Jeff, N9EDQ
AES, Milwaukee
WATTS: 1-800-558-0411
LOCAL: 1-414-358-0333
FAX: 1-414-358-3337
[email protected]
http://www.aesham.com
Current prices are subject to change without further notice.

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