What’s going on here ?? Receiving but no antenna

Useful information regarding antennas for SDR products.
ON5HB
Posts: 53
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Location: Heppen - Belgium
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Re: What’s going on here ?? Receiving but no antenna

Postby ON5HB » Mon Feb 11, 2019 9:56 am

Mike2459 wrote:Screen shot of AM Broadcast Band at 1830 local time received with 2 inch (5.08cm) hookup wire antenna connected to the Hi-Z port (P terminal ) of the RSP2.


MW stations are very strong, it's not uncommon you need to lower the input-gain a lot.
Mostly it's even enough to just hold something near the connector for it to pickup signals, not even being connected.

These bands are very hard to NOT pickup signals, that is how easy they are received.
At the same time, overloading happens pretty quickly.

Have you tried the 50 Ohm ports and reduce gain? Does the same happen?

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Greetings,

Bas - ON5HB

illllm
Posts: 44
Joined: Wed Jan 23, 2019 10:26 pm

Re: What’s going on here ?? Receiving but no antenna

Postby illllm » Mon Feb 11, 2019 11:51 am

The broadcast is Shortwave from Tennessee.... :) oh never mind you were referring to Mike.

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Mike2459
Posts: 168
Joined: Mon Jul 24, 2017 8:24 pm

Re: What’s going on here ?? Receiving but no antenna

Postby Mike2459 » Mon Feb 11, 2019 5:22 pm

Have you tried the 50 Ohm ports and reduce gain? Does the same happen?


No, I haven't. I use the same antenna for NDB chasing. The 50Ω ports don't do as well down there, so I just leave it on the Hi-Z. It's not really a problem. Just wanted to point out the sensitivity of the high impedance.

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