[Elecraft] K3: FM Filter for AM?

[Joe Subich, W4TV]

On 10/8/2010 9:30 AM, Don Wilhelm wrote:
 >
 > You can use the FM filter to receive AM, but not for transmit.  To
 > transmit AM, you must have the 6 kHz filter, so you will have to
 > sacrifice one filter.

Repeating one of my complaints about the K3 .... there is no reason
that the FM filter should not be usable for AM (or ESSB) transmit.
The filter response is well into its stopband for the IF image.  I've
checked both of my K3s on a spectrum analyzer (by telling the K3 the
FM filter was 6 KHz wide) and there is no measurable/detectable
transmit image.

73,

    ... Joe, W4TV


On 10/8/2010 9:30 AM, Don Wilhelm wrote:
>    Bill,
>
> You can use the FM filter to receive AM, but not for transmit.  To
> transmit AM, you must have the 6 kHz filter, so you will have to
> sacrifice one filter.
>
> 73,
> Don W3FPR
>
> On 10/8/2010 9:11 AM, Bill Henderson wrote:
>> Hi
>>
>> I already have the 250Hz, 400Hz and 2.7 KHz filters fitted to both
>> receivers. I plan to add 2.1KHz or 1.8kHz filters some time I in the future.
>>
>> In the nearer future I intend adding the 2m module to my K3. Since this will
>> be used for local traffic I understand that I need to add an FM filter on
>> the main receiver. Since this is a wide filter can I use it for AM as well?
>> If not then I would “need” 6 filters with only 5 slots available.
>>
>> I am a black box operator. If I find more than one switch on that box I
>> burst into tears. So please bear this in mind in your answers.
>>
>> Tia
>>
>> Bill
>> GM0VIT
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html