[FoxHunt] TDOA questions.

[R. Simmons]

 I've got a low opinion of TDOAs... their simplicity is appealing but it
causes them to be difficult to use in a real hunt, requiring more
co-operation from the user, and more "RF-awareness" than most people can
provide... hard ( sometimes impossible ) to estimate the level of confidence
in the results they produce.

Bob S.



-----Original Message-----
From: foxhunt-bounces at mailman.qth.net
[mailto:foxhunt-bounces at mailman.qth.net] On Behalf Of Andy
Sent: Thursday, August 05, 2010 8:38 AM
To: Radio Direction Finding
Subject: Re: [FoxHunt] TDOA questions.

> Otherwise, as long as the antennas are identical, they can be any
convenient
> size, although dipoles will yield best sensitivity.

A recent experience with a TDOA on a different frequency than the one
the antennas were cut for, was not very good.

We were using it about 10 or 15% higher in frequency than what the
whips were made for.  I was not going to cut them shorter just for
this occasion.  The antennas (magmounts) were spaced according to the
higher frequency.

On this occasion I never got a meaningful indication on the unit with
these antennas.

I am not sure whether the unit was at fault, or if it was because of
the frequency difference.  I meant to but did not have a chance to
investigate further.

Andy
______________________________________________________________
FoxHunt mailing list
Home: http://mailman.qth.net/mailman/listinfo/foxhunt
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:FoxHunt at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html