Can I use 75ohm cable to extend an antenna that already has a 50ohm cable attached to it?
Are you using the term "spliced" literally,or do you mean using a "bullet" adaptor between two coaxial fittings?A cable that short should never be spliced, just replace the whole thing.
The total cable length is going to be less than 6'.There's no reason to splice something that short. The cost of the proper connectors/coupling would be more than the the cost of the cable. Plus, a splice always introduces a weak point into the cable. And looks totally unprofessional.Are you using the term "spliced" literally,or do you mean using a "bullet" adaptor between two coaxial fittings?
If the former-No you shouldn't do it!
If the latter,proper coax adaptors contribute very little to losses,& in themselves,cause hardly any discernible mismatch.
To the OP--try it!
The mismatch between 50Ω & 75Ω is quite small.
If it causes a problem,you will have to get a 50Ω extension.
Out in the real world inline connections are often used to go from fairly inflexible cable to flexible coax "tails" of similar length to that proposed.The total cable length is going to be less than 6'.There's no reason to splice something that short. The cost of the proper connectors/coupling would be more than the the cost of the cable. Plus, a splice always introduces a weak point into the cable. And looks totally unprofessional.
I assumed that you had the correct connectors available.I have some TNC connectors but I need the female adapter but I could go TNC to BNC to TNC but I think that would create a major loss