Re: An FM Filter working for AM or ??

[Doug Hensley]

Can someone unravel this for me?   IF the FM filter works for AM, does the AM filter work for FM ?  If not, why not ?  Elecraft says:

** AM and FM bandwidth filters are required on the main K3 TX/RX board for TX in AM and FM modes. (Only one AM filter is required for AM TX/RX, and one FM filter for FM TX/RX.) All filters can be used for RX in any mode.

So,, just what do those of us new to the K3 line need to know when choosing an AM filter ?  Are they saying "Pick your transmit mode and don't worry about the receive mode?"


This in response to:

/Message: 7
/Date: Thu, 28 Jan 2016 14:33:01 -0500
/From: Art Hejduk <[hidden email]>
/To: Clay Autery <[hidden email]>
/Cc: "[hidden email]" <[hidden email]>
/Subject: Re: [Elecraft] Need a second set of eyes... WAS: Re: Price
 /       Increase Alert for Feb 4th.
/
/Clay,
/
/The FM filter will work for both AM and FM.  That's what I chose.  Also, I
/would (did) just get the 400Hz CW filter.
/
/73,
/Art  WB8ENE
/
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[Bill Frantz]

It used to be that you needed an AM filter for AM (6KHz
bandwidth) and an FM filter for FM (c15KHz bandwidth). A while
ago, a firmware update made it possible to transmit AM using the
FM filter.

Because you can now run AM through the FM filter, there isn't a
lot of use for it. If you run ESSB it may be useful for blocking
nearby strong stations. It also may improve your AM signal or
ESSB signal over using the FM filter, but I haven't seen any
real tests of this possibility.

73 Bill AE6JV

On 1/29/16 at 5:53 PM, [hidden email] (Doug Hensley) wrote:

>Can someone unravel this for me?   IF the FM filter works for
>AM, does the AM filter work for FM ?  If not, why not ?  
>Elecraft says:
>
>** AM and FM bandwidth filters are required on the main K3
>TX/RX board for TX in AM and FM modes. (Only one AM filter is
>required for AM TX/RX, and one FM filter for FM TX/RX.) All
>filters can be used for RX in any mode.
>
>So,, just what do those of us new to the K3 line need to know
>when choosing an AM filter ?  Are they saying "Pick your
>transmit mode and don't worry about the receive mode?"

-------------------------------------------------------------------------
Bill Frantz        | Airline peanut bag: "Produced  | Periwinkle
[phone]      | in a facility that processes   | 16345
Englewood Ave
www.pwpconsult.com | peanuts and other nuts." - Duh | Los Gatos,
CA 95032

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[Art Hejduk]

The AM filter will not work for FM.  It's too narrow.

Art. WB8ENE

Sent from my iPad

> On Jan 28, 2016, at 8:53 PM, Doug Hensley <[hidden email]> wrote:
>
> Can someone unravel this for me?   IF the FM filter works for AM, does the AM filter work for FM ?  If not, why not ?  Elecraft says:
>
> ** AM and FM bandwidth filters are required on the main K3 TX/RX board for TX in AM and FM modes. (Only one AM filter is required for AM TX/RX, and one FM filter for FM TX/RX.) All filters can be used for RX in any mode.
>
> So,, just what do those of us new to the K3 line need to know when choosing an AM filter ?  Are they saying "Pick your transmit mode and don't worry about the receive mode?"
>
>
> This in response to:
>
> /Message: 7
> /Date: Thu, 28 Jan 2016 14:33:01 -0500
> /From: Art Hejduk <[hidden email]>
> /To: Clay Autery <[hidden email]>
> /Cc: "[hidden email]" <[hidden email]>
> /Subject: Re: [Elecraft] Need a second set of eyes... WAS: Re: Price
> /       Increase Alert for Feb 4th.
> /
> /Clay,
> /
> /The FM filter will work for both AM and FM.  That's what I chose.  Also, I
> /would (did) just get the 400Hz CW filter.
> /
> /73,
> /Art  WB8ENE
> /
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

______________________________________________________________
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