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

[Joe Subich, W4TV]

 > I bet it will work.

Yes, it works.  That's how I was able to transmit through the FM filter
to test with the spectrum analyzer.

> I am not sure what effect this would have on the TX width, maybe
> someone can check it out.

Since modulation is performed in DSP, there is no change in the TX
width.

73,

    ... Joe, W4TV


On 11/7/2011 7:16 PM, goldtr8 at charter.net wrote:
> Why not go to the confurgation menue and change the filter setting from
> 13 to 6 khz.   I bet it will work.
>
> I dont have the filter so I can not check it out.
>
> I am not sure what effect this would have on the TX width, maybe someone
> can check it out.
>
>
> ~73
> Don
> KD8NNU
>
>
> On Mon, Nov 7, 2011 at 1:34 PM, Oliver Dröse wrote:
>
>> 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
>>>
>>>
>>
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