I forgot to add in my previous post a very important detail, when attempting to tune a RX antenna, or look for "any" anomolies it pays to have some sort of a baseline.
To achieve this requires setting the RX up as if it was in an aircraft that has no RF issues (like carbon). What you want is to determine how many feet you can achieve under ideal conditions. With this information, deciding what you will accept as a result of degradation due to things like carbon become much clearer....
John Derstine wrote:
I have also heard of other approaches including de tuning one rx slightly from the other, the bottom line is who wants to do that, or wrap your rx in the hopes that it works? I do know some TOC level pilots who still choose to use two rx's in their planes but three or four? Is this feasible?
JD
Endless Mountain Models
http://www.scalesoaring.com
email: [EMAIL PROTECTED]
-----Original Message----- From: Simon Van Leeuwen [mailto:[EMAIL PROTECTED] Sent: Friday, March 25, 2005 6:20 PM To: John Derstine Cc: [EMAIL PROTECTED]; 'Dave Register'; [email protected];
'Gordy
Stahl'; 'Barry Kennedy' Subject: Re: [RCSE] Re: Soaring V1 #5375 - Shadow 3
The problem on dual RX setups is not the antennas, but co-interference between the IF's within each of the RX's. This is what reduces sensitivity. This problem is solved easily by shielding one or both
RX's.
The shielding can be as simple as a 6" x 6" conductive plate that is strategically place between the two RX's, or could mean literally wrapping one RX with a highly conductive shielding material (eg: permeable copper).
John Derstine wrote:
Just a cheap shot, could not resist, blame Gordy for his endless overstated hype about everything and anything.
Anything good, and I assume the Shadow is, will out perform a Hitec
or
FMA rx, apples to oranges indeed. That was the point of my comment
not
that it is tiny or light.
The new technology available will be a great advantage especially
for
the micro pilot, or someone looking for features like this, as far
as
using two three or four ganged up for a giant scale ship however,(
as
stated by some, and of interest to others who might use this rx.) my communications with Mr. Arroosh Elahi have been inconclusive as to
what
if any range degradation you might get putting two or more rxs in
one
plane. TOC pilots tried this a long time ago with large aerobatic
ships
with the result that there was often significant range reduction
with
using two rxs in one aircraft due to the antennas somehow
interfering
with each other. This both with Futaba and JR rxs. I offered to test
two
in a plane but have not heard back. If some one would kindly perform
a
simple range check with two rxs or more in a large aircraft, with antennas running parallel inside the fuselage. or send me two to
test, I
will gladly pay for them ,and send them back for a refund after
testing
on the ground, not flying, The comment I got from Mr. Elahi was that tests were "pretty good", but they had not the chance yet to go out
and
fly much until the weather improved...
If these little rxs indeed perform with unhindered range (ganged up)
as
compared to a single 10 channel PCM rx (original branded equipment)
then
it would be an interesting development for giant scale applications.
Synth tuning is not a feature that is critical other than
convenience,
and for the average pilot, not so necessary. I travel with several modules and xtals that serve my purposes very well, the real issue
is
all the other performance data. The stuff that keeps your plane in
the
air.
JD
-----Original Message----- From: George Gillburg [mailto:[EMAIL PROTECTED] Sent: Friday, March 25, 2005 2:49 PM To: John Derstine Cc: 'Dave Register'; [email protected]; 'Gordy Stahl'; 'Barry
Kennedy'
Subject: RE: [RCSE] Re: Soaring V1 #5375 - Shadow 3
Gee, that is almost as good as a JR 10x with a standard PCM rx
Yes, but is the JR standard PCM rx synthesized? Does it weigh 8
gms?
Somehow, I doubt it.
George Gillburg Bakersfield, California
-- Simon Van Leeuwen RADIUS SYSTEMS PnP SYSTEMS - The E-Harness of Choice Cogito Ergo Zooom
RCSE-List facilities provided by Model Airplane News. Send
"subscribe"
and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only
format
with MIME turned off. Email sent from web based email such as Hotmail
and
AOL are generally NOT in text format
RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
-- Simon Van Leeuwen RADIUS SYSTEMS PnP SYSTEMS - The E-Harness of Choice Cogito Ergo Zooom
RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
