[K3CAL] Any oscope and signal analysis experts?

[David Metler]

Thank you Rich.  That is good info.  I ll try the free tone generator at
1khz.     Im using an ameritron al80b.  The odd thing is...i get a better
form using the amp then I do just the FTDX3000.   Maybe because I have the
ALC set correctly with the amp.  I guess once I get the hang of
things...maybe I can adjust the sound settings on the transceiver.  They
are all on default currently and I dont use any compression.  .

On Sun, May 15, 2016 at 10:35 AM, Rich Weaver <weaverr at comcast.net> wrote:

> It looks like (to me) your RF signal is in good shape.
> A simple and basic way to check is to apply a single tone about 1KHz.
> It can be an audio tone thru a microphone.
> Make sure your audio compression is off. There are many settings
> on the FTDX-3000 to compensate for your voice.
> As we all know the idea is not to overdrive your audio on the radio.
> As stated there is good information in the ARRL handbook.
>
> I’m not sure what kind of RF amplifier you are using but some amps
> have a switch so you can change the bias and run Class C as well as Class
> AB1 or AB2.
> Class C is for A.M. , F.M. and CW modes. Some amplifier instructions for
> tune up is
> to put a CW (carrier signal) and adjust the amplifier. Once completed the
> tune up put the
> switch back in the SSB mode.
> Class AB is for SSB and linear compared to Class C.
>
> Rich-WW3ZZ
>
>
>
> *From:* David Metler <halltrailfab at gmail.com>
> *Sent:* Saturday, May 14, 2016 1:49 PM
> *To:* Calvert Amateur Radio Association - K3CAL <k3cal at mailman.qth.net>
> *Subject:* Re: [K3CAL] Any oscope and signal analysis experts?
>
>
> Pic didn't attach
> On May 14, 2016 1:48 PM, "David Metler" <halltrailfab at gmail.com> wrote:
>
>> I have gotten great reports on my audio with amplifier...but as a
>> learning exercise...I connected my oscope to my rf output to see what my
>> signal looked like..in some cases with no amplifier..it looks like my audio
>> flat tops.  But I don't know how to correct that with my ftdx 3000.  Here
>> is a video of the audio sampled with amplifier putting out  600 watts.  And
>> a freeze Fram pic that does look good.
>>
>> One thing that I'm not sure about is if I have my oscope settings
>> correct...as I really have know idea what I'm doing lol.  Hopefully you can
>> see some of the settings in the freeze frame. I'm connected to an unused
>> antenna output (antenna #2)on an ameritron atr 30 tuner and transmiting on
>> antenna 1.  Basically just using the coupling effect to sample the rf..with
>> out  having to make or buy an rf sampler.
>>
>> What do you all think?
>>
>> https://youtu.be/BP3sy4dx6oM
>>
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