Which Filter for Transmit

[Mike Miller-14]

If I have the 2.1 filter selected....for receive...on main receiver and I transmit...am I transmitting thru the stock 2.7 kc filter or thru the 2.1 filter?  Does the radio transmit thru the widest filter?




Mike Miller KA5SMA
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[Iain MacDonnell - N6ML]

Mike Miller wrote on 07/ 9/08 02:44 PM:
> If I have the 2.1 filter selected....for receive...on main receiver and I transmit...am I transmitting thru the stock 2.7 kc filter or thru the 2.1 filter?  Does the radio transmit thru the widest filter?

I see two different answer for this on the website. The order page says:

"On SSB the K3 should transmit through the widest SSB filter available,
typically 2.7 or 2.8 kHz. (You can receive on any filter.)"


but the FAQ says:

http://www.elecraft.com/K3/K3FAQ.htm#KFL3A Filters

"What if I want to transmit SSB via the 2.8 kHz filter but receive via
the 1.8 kHz filter? Answer for main RX only and for both RXs.

You specify which filter to use for TX (one of the filters on the main
RX/TX board) independently of which filters to use in RX mode. This
applies whether you have a sub installed or not, and whether you're
doing split or not. When you hit PTT, the TX path (on the main RX/TX
board) takes over. When you release it, whatever RX-mode filters you had
selected for each receiver is then in effect."


I'm guessing the option to select filters for TX was added in a firmware
update somewhere along the way...

     ~Iain

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[N9BX]

I have a

On 6 meters I have a very low SSB Output.  CW has a full 100 Watts
output but SSB only peaks around 35 Watts.  But that is only on 6 meters
.  When I switch to 20 meters SSB I get the full 100 Watts SSB. same Mic
  nothing has changed except the Band.  What Am I missing on 6 Meters to
give me the Low Output?

73 Bruce N9BX
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[Don Wilhelm-4]

Mike,

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 Transmit
Filter) message.

See the Errata sheet that shipped with your K3.

73,
Don W3FPR

Mike Miller wrote:

> If I have the 2.1 filter selected....for receive...on main receiver and I transmit...am I transmitting thru the stock 2.7 kc filter or thru the 2.1 filter?  Does the radio transmit thru the widest filter?
>
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> Mike Miller KA5SMA
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