Re: [Discuss-gnuradio] TVRX / pigtail impedance

[Matt Ettus]

Sylvain Munaut wrote:
> Hi,
>
> I recently acquired a USRP with a TVRX. In the package there was also a
> F -> SMA pigtail to put in the front.
>
> But that kinda surprised me from an impedance point of view because:
>  - The TVRX input is 75ohm according
>  - F connector is 75 ohm afaik.
>  - The RG316 cable used for the pigtail is 50ohm
>  - SMA is 50 ohm afaik.
>
> So that looks like a weird mix.

Yes, it is a weird mix.  But it doesn't really make any difference for 
that short piece of coax at these frequencies.  If you really want, you 
could get a 50 ohm to 75 ohm transformer and then just use SMAs.

Matt