[K3CAL] Any oscope and signal analysis experts?

[David Metler]

Jim, that is interesting...i didnt realize you can do that...i may just
have to try that.  lol.

On Sat, May 14, 2016 at 6:13 PM, James Tetlow <k3uga at comcast.net> wrote:

> If its just a temp, right at the test equipment, just use 120 volt lamp
> pigtail and 200 watt lamp anywhere from 120 volt to 150 volt rough duty.
> If you want cheep, just remember its SHORT DUTY CYCLE. If you put 5 in
> series you have about 1kw. They will get hot fast so mind how you mount
> them.
>
> Sent from my iPad,
> Best Regards, 73,
> Jim Tetlow
>
> On May 14, 2016, at 17:51, tom rozenbroek <tom.rozenbroek at comcast.net>
> wrote:
>
> If you are not sending too much power, a dummy load can be built using
> CARBON resistors. Wire wound resistors are more reactive as the frequency
> increases. A few years ago (Ok, more like 25 years ago), I put together a
> dummy load that gave a good resistive load up thru 6 meters using 100 5
> watt carbon resistors. Total cost for the project including case was under
> $15.00 (doubt I could do the same today, but it would still be
> inexpensive). It worked well until I left it at ham radio meeting.
>
> Food for thought.
>
> 73s
> kb2bcg
> -----
>
>
>
> -------- Original message --------
> From: David Metler <halltrailfab at gmail.com>
> Date: 05/14/2016 14:34 (GMT-05:00)
> To: Calvert Amateur Radio Association - K3CAL <k3cal at mailman.qth.net>
> Subject: Re: [K3CAL] Any oscope and signal analysis experts?
>
> OK thanks. .yeah. .I need to pick up a dummy load
> On May 14, 2016 2:30 PM, "WA4PRR" <wa4prr at comcast.net> wrote:
>
>> Looks pretty good.  If you have a tone generator, you can get a better
>> display of the peaks and valleys.  Some guys whistle a tone, but I wouldn't
>> do too much of that on an antenna.
>> 73,
>> Ron / WA4PRR - Sent from my iPad
>>
>> On May 14, 2016, at 1:49 PM, David Metler <halltrailfab at gmail.com> wrote:
>>
>> 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
>>>
>> <Screenshot_2016-05-14-13-36-32.png>
>>
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