75/50 ohm for RSP1a connection

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HKIAA
Posts: 3
Joined: Tue Apr 16, 2019 9:11 am

75/50 ohm for RSP1a connection

Post by HKIAA » Mon Apr 22, 2019 6:26 pm

Hello,
Just ordered RSP1a . SDR receivers antenni connector is 50 ohm. My antenna (fm antenni range 87—108 MHz) cable is 75 ohm.
I not so familar with these converters 75/50 ohm .
Is there any instructions for these converters . Or is commercial converters available .

Rgds,

HKIAA
Last edited by HKIAA on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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sdrom33
Posts: 123
Joined: Sun Dec 09, 2018 4:38 pm

Re: 75/50 ohm for RSP1a connection

Post by sdrom33 » Mon Apr 22, 2019 7:35 pm

For FM signals are generally so strong you can take the mis-match loss between 50 and 75 Ohm and safely connect the antenna to the rsp receiver. Remember though that it should be advisable to have some protection in between, should you have lightning nearby and related induced transients. A small choke in parallel, maybe.

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g1hbe
Posts: 483
Joined: Sat Jan 17, 2015 3:28 pm
Location: Cheshire, UK

Re: 75/50 ohm for RSP1a connection

Post by g1hbe » Mon Apr 22, 2019 7:37 pm

There's no need to convert. The mismatch loss will be tiny and the quoted impedances are nominal, likely to be significantly different from the spec anyway.

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Andy

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