[Elecraft] K3: Why can't I use my 1.8kHz filter for SSB TX?
Jan Erik Holm
sm2ekm at telia.com
Mon Jan 25 01:44:02 EST 2010
I would like to use the 2.1 kHz filter for SSB TX.
Elecraft any solution?
Jim SM2EKM
----------------
On 2010-01-24 19:38, Brian Machesney wrote:
> Yes, I did search the archives to find out "why you can transmit through
> some filters and not through others" before posting this question to the
> reflector. The only "authoritative" information I found information was this
> from July 2008:
>
> "Until further information to the contrary is available from Elecraft, you
> must select the 2.7 or 2.8 filter for SSB, Data and CW transmit. The AM
> transmit filter must be 6 kHz and the FM transmit filter must be 13 kHz. Any
> other settings will result in failure and a ERR TXF (Error TX Filter)
> message.
>
> See the Errata sheet that shipped with your K3.
>
> 73,
> Don W3FPR "
> To the best of my ability to discern, this does not indicate the reason for
> the limitation. In fact, the phrase "until further information" and the fact
> that ESSB uses a different filter than "traditional" SSB indicates to me at
> least the possibility that there may be "firmware" reasons for this
> limitation (like BFO alignment on TX and RX), not that there aren't also
> possibly "hardware" reasons (like carrier rejection, etc.). If someone knows
> the theory of the radio's operation well enough to help me understand the
> limitation, I would like to be enlightened.
>
> So yes, I did look for the answer in the reflector archives and no, this is
> not a request for Elecraft to take valuable time out from their other
> activities to react to my personal "wish list."
>
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