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[Linrad] Re: Phase relationship V to H in Linrad RX
- Subject: [Linrad] Re: Phase relationship V to H in Linrad RX
- From: attglobal.net; radio1@xxxxxxxxxxxxxxxx>
- Date: Mon, 16 Mar 2009 16:16:36 +0000
You can see my concern. Thinking HF, there may be concideral rotation of
the incomming wave and I don't know how linrad or map65 adds these
two complex vectors. Now add in that I may be adding more distortion by
using antennas which are not colocated.
tNX for the response, John K1VBM
---- Original Message ----
From: Edward Cole <kl7uw@xxxxxxxxxxxxx>
To: Linrad <linrad@xxxxxxxxxxxxxxxx>
Subject: [Linrad] Re: Phase relationship V to H in Linrad RX
Date: Sat, March 14, 2009, 17:10:00
At 01:06 PM 3/14/2009, John wrote:
>Lief and Joe,
>Is there a degridation of Linrad (or MAP65) if the H and V signals are
>out of phase. I am thinking of HF rx for wisper, My H and V may have
>several wave lengths difference in feed line. Is this a problem?
>I'm still thinking of this as diversity reception, perhaps a bad model
>but the only mental picture I have.
>Tnx, John K1VBM
I am only guessing, but probably the only thing recovered by Linrad
is the amplitude of the H and V signals. If so, then it is assumed
that the two signals are orthogonal (90-degrees out of phase) and the
magnitude of each vector is used to determine the resulting polarity
If, however, the two signals are combined as analog RF voltages, then
the phase will definitely matter. I am guessing this is what concerns you.
As I understand it, MAP65 merely takes the digital baseband and
decodes them. It should not matter what the phase angle is between
the two signals. It is also possible that Linrad outputs a single
vector addition signal with all information contained. MAP65 would
only be dealing with a single data stream.
Just my assumptions ;-)
Ed - KL7UW
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