SDRplay Community Forum

Beware that the coax is part of the antenna but if not properly isolated from common-mode-currents it can either make it receive badly or receive a lot of electrical noise from buildings nearby. Typical the thing is placed on a wooden stick and the coax isolated at the ground level, but as far away ...

The thing is, why do you need to isolate anything? I asked you several times, yet you never answer. I tested with a 50 Ohm splitter on my wideband websdr and signals went down, a lot. Maybe it works for smallband but it does not when using 1-2MHz wide. Also it doesn't work when using 3 bands, like 0...

Think with your own head, do not believe in false prophets, trust what you measure and see...I have gone to walk the dog...take it easy. You do not get it do you? SWR is a non-issue. Antenna-analysers are a non-issue too. They do not say anything and they do not build good antenna's. Example, analy...

sdrom33 wrote:The right reply is that nobody in his senses would use a 50 Ohm connector on a 75 Ohm coax....come Mike, stop this nonsense and have a peaceful Easter,

And what if you do? How much losses does it give?
Will you notice? If so, how much?
And last. Prove it!

Funny is, I installed and MFJ SDR-switch the other day, the RSP1A's have the same signal as before, but the Icom7300 dropped by 10~20db in reception. Why did the Icom drop and the RSP1A's didn't? Bas, it is the rsp1a magic....It receives better because it has no mixers... : :oops: In fact where Sdr...

Nowhere in the RSP-1A spec sheet is it stated that the RSP-1A has an input impedance of 50Ω. It does say this under the heading: Connectivity: "Single 50Ω RF connector (SMA)" My non-professional knowledge of this topic suggests that circuit impedance is determined primarily by the source (the anten...

What do you mean wrong info and specs? It's not a transmitter but a receiver, as such impedance isn't crucial to good workings. Exactly what I wrote. The official published specifications by Sdrplay say: 50 Ohm input impedance. If you write in so many words it is not so, you are being unfair to Sdr...

I tried the RSP1A on FM (3m band) and it's absolutely splendid.

sdrom33 wrote:It could help to know what splitters you are using. The RSP1a input is rated 50 Ohm, why should it be different? Why should sdrplay give wrong info & specs?

What do you mean wrong info and specs?
It's not a transmitter but a receiver, as such impedance isn't crucial to good workings.

I tested a splitter for the RSP1A. Normal situation is T-connectors to 3x RSP1A. I tried an splitter 5-2500MHz, splitted and the signals went down a lot. This makes me believe that the input of the RSP1A is not 50 Ohm but very high impedance. My splitter made a big impact on the signals, where my de...