[Elecraft] [K3] Filters for mixed JT65 and JT9 HF

Charlie T, K3ICH pincon at erols.com
Mon Oct 7 19:31:15 EDT 2013


I believe that figure of 3400 Hz is the AUDIO bandwidth which is equivalent 
to an AM bandwidth twice that, or 6.8 kHz.  If I am correct, then you can 
most certainly take advantage of your 6 kHz AM filter which will limit your 
broadcast audio bandwidth to 3.0 kHz.  The 15 kHz filter will get you an 
extra 400 Hz.of audio, but is probably not practical due to the excessive 
bandwidth.  Save that one for FM.

73, Charlie k3ICH
>
>
> On 10/7/2013 4:51 PM, Joe Subich, W4TV wrote:
>>
>> On 10/7/2013 4:39 PM, Bob wrote:
>>> Just be aware that current DSP firmware in the K3 limits the receive
>>> bandwidth to something around 3400 Hz. So even if you have a wider
>>> filter, like the 6 KHz AM filter, you will not be able to utilize the
>>> full 4 KHz bandwidth of WSJT-X for JT65/MT9 modes.
>>
>> 


More information about the Elecraft mailing list