That is the next step I think, how far apart do you put the antennas? I'm g=
uessing they can't be too far apart.

Thanks,

Joe
________________________________________
From: piclist-bounces@mit.edu [piclist-bounces@mit.edu] On Behalf Of Justin=
 Richards [justin.richards@gmail.com]
Sent: 03 June 2014 19:38
To: Microcontroller discussion list - Public.
Subject: Re: [OT] Matching an antenna to a VHF TX/RX

>
> antennas shows a much deeper dip & has the dip at a slightly higher
> frequency of ~153.8MHz. Plots are attached showing the dip with each
> antenna, together with a transmission peak on channel 1 from a hand-held =
TX.
>
> We find that reception is poor on one of the boats, but whether this is
> down to poor reception in that boat or poor transmission in the other is
> hard to say.
>

Hi Joe,

 Is it possible to determine with the aid of the hand held which is the
boat with the poor antenna/radio system.

We often use a spectrum analyser with a tracking generator to test antenna
feeder path (including baluns etc) - antenna performance, but we have the
luxury of three antennas (A B C) and all equidistant.

To test C we connect the tracking generator to B and analyser input to A.
 Then save trace to screen, connect analyser input to C and compare to the
screen saved trace.  We can then tap and wiggle all the connectors in the
path of C and any faulty components are quickly identified.  We have many
connectors and components in each path that are not easy to replace so this
works well to surgically identify the fault.  (Not useful for us to
determine resonant freq)

Not so easy with just 2 boats but still doable.

Justin
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