On 3/7/20 6:43 PM, David C wrote:
dummy load is a termination with only an input!
If its a parallel connection, yes. Why not a series connection?
VNAs are intended to do "thru' measurments on systems of a
characteristic impedaance (probably 50 ohms)
Uhhh...wha?? No. That's one thing that they can do, but the
assertion that they are "intended" to only do thru measurements is
false. Very, very false.
Some are able to do "single port' i.e. connect the load across the TX
port and read that.
I've never seen a VNA that is unable to do "single port". And from
where I'm sitting right now I can throw a wad of gum at five different VNAs.
Thats not actually
a 'network analysis' because a dummy load is not exactly a network (read
about Fosters networks).
In fact is *is* exactly a network, and performing an S11 analysis on
one is in fact, by definition, network analysis.
Wow. Please read up on what a network is and what VNAs do.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
Dave McGuire