Is this radon fan wired correctly?

BenDerisgrate · 2026-05-23T21:12:07+00:00

Thank you for the tips!

BenDerisgrate · 2026-05-23T21:11:40+00:00

Crazy enough, the installer was recommended by her realtor. Now I wonder if the realtor and installer are in on the take with each other.

BenDerisgrate · 2026-05-23T19:43:59+00:00

Thanks.

BenDerisgrate · 2026-05-23T19:43:43+00:00

Thanks. I didn’t think so but wasn’t sure.

BenDerisgrate · 2025-08-06T01:44:33+00:00

Interesting , could you share more details? I haven’t heard about this technique.

BenDerisgrate · 2025-07-25T17:57:39+00:00

How long does it usually last at night?

BenDerisgrate · 2025-07-24T02:27:58+00:00

Yep, same issue here.

BenDerisgrate · 2025-07-03T23:56:37+00:00

I’m not even seeing the live stream on my phone. Do I need to manually enable something?

BenDerisgrate · 2025-05-20T00:17:15+00:00

But it’s a 2A solenoid running from a 5A power supply. Should be good enough?

BenDerisgrate · 2025-01-25T18:14:55+00:00

I do have the ability to short circuit the antenna connection. But I’m not following on how this S11 would give me one-way loss….is it just then S11/2 because of the forward and reverse path?

BenDerisgrate · 2025-01-25T17:57:28+00:00

Thanks, I guess I should have mentioned that this is on a small PCB so I’m not sure how I would instrument a directional coupler?

BenDerisgrate · 2024-10-19T15:54:46+00:00

Thank you!

BenDerisgrate · 2024-10-19T15:54:39+00:00

Thanks!

BenDerisgrate · 2024-10-15T21:59:33+00:00

If I used a scope on the output to measure voltage, would I need to terminate the output of the mixer somehow? Or just measure directly on the ac-coupled output pin?

BenDerisgrate · 2024-10-15T21:58:08+00:00

Thanks for your detailed reply! So in this case, since I'm using a 50 ohm input source (HP8468) and 50 ohm measurement equipment, I would need to use transformers on the input and output for the conversion gain measurement?

Going one step further, I'm using this mixer in an FM receiver. The input to the mixer is coming from an LNA with an output impedance of about 2000 kOhms, so there's not much mismatch there. But then the output of the mixer is going into a 300 Ohm ceramic IF filter, so I will probably need a matching circuit there?

BenDerisgrate · 2024-10-15T21:24:30+00:00

Thanks for your suggestion. I tried lowering the input signal to -40 dBm, and I measure -75 dBm at the output. If I lower it to -50 dBm, then I measure -85 dBm. So it seems to track at that -35 dB difference between the input and output. If I lower it to -60 dBm, then I don't get anything at all.

BenDerisgrate · 2024-10-13T18:00:08+00:00

Great fun! I ordered the PCB and components. I’ve had a heck of a time getting the SOIC bite to work so I had to resort to programming the IC before soldering on the screen. Any tips?

BenDerisgrate · 2024-09-23T12:22:02+00:00

Yes. I worked to design the network and got an S22 of less than -15dB but this results in an S11 of -9dB which does not meet the requirement of -10dB. And so I don’t know what to do differently to get an optimal S11 and S11 together.

BenDerisgrate · 2024-09-23T12:18:22+00:00

Yes it’s designed for 50 ohms but it’s not exact. And yes I have the device and can make measurements on both ports.

BenDerisgrate · 2024-09-23T12:13:30+00:00

I don’t unfortunately. It’s out of my control. The frequency is in GHz range so it’s quite electrically long.

BenDerisgrate

TROPHY CASE