In general, good quality 75 ohm (CATV) coax is perfectly acceptable for receive applications, and for that matter, most transmit applications. There's a fair bit of misconception about the amount of "loss" introduced by an impedence mismatch.
If you mentioned the frequency range you're interested in, I missed it. the higher you go (i.e., VHF vs. HF, or UHF/SHF vs. VHF), loss does start to matter. There's an effective attenuation factor at different frequency ranges in coax based on length: it's effectively a resistor. As Doug and Albin (above) note this has to be accounted for.
gerry n5jxs
On Tue, Jan 29, 2019 at 3:57 PM david vanhorn <kc6ete@gmail.com> wrote:
_______________________________________________It would be very helpful to know the main frequency of interest.
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