[Elecraft] An FM Filter working for AM or ??

[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, w5jv at hotmail.com (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?"

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