Does anyone have any idea on how to do this on a Tek 7904? These models
do not bring the deflector circuits out.
k7fm wrote:
>>I have a Tek-475, just no probes or manual. The manual I can get from
>>the internet, but the plethora of knobs and buttons on the 475 has
>>humbled me. To be honest, I have no idea what most of them do.
>>
>>
>
>
>
>>I know I need a RF probe, but not sure if that is something easy to
>>build or buy.
>>
>>
>
>The 475 is a nice scope. I have one sitting about 10 feet away. It has a
>200 MHz bandwidth.
>
>You do not need any special expensive probes to check linearity of the
>amplifier. "Amateur Single Sideband", originally published by Collins Radio
>has a nice envelope detector circuit which can be built quickly. A detector
>is placed on the output of the amp and another one at the input. Each unit
>uses 2 capacitors, 2 rf chokes, 1 diode and 1 resistor. The output of each
>would go through shielded cable to a bnc for connection to the scope.
>
>Although the scope may look frightening, it can be learned rather quickly.
>Certainly not as complex as a modern multi-memory transceiver that has 25
>different uses for the same buttons. I need to get the manual out and sit
>dazed for many minutes before completing a simple task on my uhf/vhf rig.
>Last time I went out on a hidden transmitter hunt and pulled over to try to
>figure out how to use the attenuator mode of the squelch control. I got the
>manual out and it referred to a control that was not on my radio. So, then
>I had to page through the entire book to figure out how I could get to that
>menu. In the meantime, a police officer stopped to see if I needed help. I
>told her I did. I also explained that the fellow out in the field with a
>small yagi also needed help, because he was really lost. As she was
>leaving, she noted that my license plate was 3 months expired. The good
>news is that she also noted that I have a County Sheriff's Search and Rescue
>tag on my car so she did not bother giving me a ticket. But, I can operate
>the 475 without a manual.
>
>The 475 would be frightening if it only had 5 controls.
>
>73, Colin K7FM
>
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>
>
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