Total posts : 45366
Lee,
Glad to help. For brevity, I didn’t get too detailed in my previous post. so I’ll add something here for you to consider.
Yes, that is a lot of attenuation and it is likely that if you do not add an internal shield between the input and the output that stray coupling between in and out inside the box will reduce the attenuation quite a bit. If you use a tee network, run the center resistor through a hole drilled in a metal shield. Install the shield perpendicular to the resistor in the box and ground it to the box. This directs the signal only through the resistor rather than allowing coupling around it.
A while ago I built a 5 step attenuator doing this. With the shields I described it worked like a champ at 146 MHz.
I hope you will report back the results of your test. You may be disappointed in the range which results but it will be interesting to read your report.
Neil
