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Author Topic: What is the most sensitivity radio ? No tranceiver  (Read 304 times)
SV1EDR
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Posts: 8




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« on: December 16, 2007, 07:13:31 AM »

What is the No1 radio best sensitivity to the world ??
I speek about a radio portable or base NOT TRANCEIVERS
to AM BAND ONLY  540-1720Khz.
---------------
1....to portable radios.
2....to base radios.
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K0BG
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Posts: 9844


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« Reply #1 on: December 16, 2007, 12:01:29 PM »

Sensitivity is NOT the main criteria for selecting an AM BC radio. It is selectivity! Most assuredly, the limiting factor is band noise, and you can present a case where too much sensitivity is a bad thing.

Another issue is directivity. Several companies, Palomar Engineering is one, make amplified, loop antennas which can be used to null out offending stations.

While I admire your quest for a decent DX-capable, AM radio, there is more to it than meets the eye.

Alan, KØBG
www.k0bg.com
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WB2WIK
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Posts: 20547




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« Reply #2 on: December 17, 2007, 09:01:23 AM »

"Sensitivity" on such a low frequency is always noise limited and the actual difference between an extremely sensitive receiver and one with 1/10th that sensitivity is nothing, if you use an antenna large enough to hear solar/atmospheric noise.

Test for this is to tune where there is no station to hear, and plug in an antenna.  If the antenna raises the noise level of the receiver when it's plugged in, you have more than enough sensitivity for use with that antenna, no matter what the sensitivity "number" is.

Where I live, with a 160m dipole as an AM BC receiving antenna, I have a significant increase in noise level when my receiver sensitivity is set at about 10uV in a 6kHz bandwidth.  If my receiver sensitivity was .001uV, I would not hear anything any differently than with 10uV, using that antenna.

WB2WIK/6

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