36:48 - odd values, I wonder why they did not use 2^n and start with 0.25 dB, that would with the same 10 relays give up to 255 dB in 0.5 dB steps. Or is more than 20 dB attenuator in one step just too hard to make ?
I think the values are chosen for what makes the most useable attenuation range. 0.25 dB would require the two top T configuration resistors to be 719.51 milliOhms perhaps more difficult (or costly) to make such small value of resistance? Also going up to 255 dB is such a huge attenuation it is not useful at low RF levels. This attenuator is 1 watt max. As it is 130 dB is down to fraction of a microvolt.
Very informative and well worth watching.
This guy needs more subs! Great content!
Thanks! Glad you are enjoying the channel.
Nice video ❤ thanks
Glad you enjoyed it, thanks for watching!
Thanks fo the video!
You're welcome and thanks for watching!
36:48 - odd values, I wonder why they did not use 2^n and start with 0.25 dB, that would with the same 10 relays give up to 255 dB in 0.5 dB steps.
Or is more than 20 dB attenuator in one step just too hard to make ?
I think the values are chosen for what makes the most useable attenuation range. 0.25 dB would require the two top T configuration resistors to be 719.51 milliOhms perhaps more difficult (or costly) to make such small value of resistance? Also going up to 255 dB is such a huge attenuation it is not useful at low RF levels. This attenuator is 1 watt max. As it is 130 dB is down to fraction of a microvolt.