[Elecraft] AM with FM filter (was: Re: [Elecraft_K3] Re: Close to Ordering)

[Oliver Dröse]

Hi Joe,

interestingly you CAN transmit AM with the FM filter! But it just works for 
one over. ;-)) Found it out by chance during the last few weeks with the 
nice 10 m conditions when tuning to the AM portion of the band. I only have 
the FM filter fitted (besides CW/SSB filters) and running firmware 4.42 beta 
(not tested with other ones) I can transmit in AM. Just AFTER releasing the 
PTT I will get an TXFILERR on the VFOB display and will not be able to 
transmit anymore. You need to power-off and on the radio then to make it 
work again. As that is no good QSO practice and you probably miss a few 
sentences from your QSO partner during "K3 reboot" I just did one QSO that 
way (and furthermore I am not really interested in AM just wanted to try it 
out). ;-))

Just my observations on that topic. Besides I completely agree with you, I 
do not see why you should not be able (or better "allowed") to transmit AM 
through the FM filter ...

73, Olli - DH8BQA



----- Original Message ----- 
From: "Joe Subich, W4TV" <lists at subich.com>
To: <Elecraft_K3 at yahoogroups.com>
Sent: Monday, November 07, 2011 6:13 PM
Subject: Re: [Elecraft_K3] Re: Close to Ordering


>
> > If you wish to transmit AM, you'll need a 6 kHz filter.
> >
> > If you wish  to transmit FM, you'll need a 13 kHz FM filter.
>
> This still bugs me ... *WHY* won't Wayne enable AM transmit
> with the FM filter?  I've run multiple tests with a spectrum
> analyzer and can find no image when I set the bandwidth of
> the FM filter to 6 KHz to enable AM and generate a test signal
> with the two-tone generator.
>
> I don't want to waste one of the limited filter slots for both
> AM and FM filters but I want to be able to transmit either mode
> if so inclined.
>
> 73,
>
>    ... Joe, W4TV
>
>