[roc-chat] Re: Anyone With The Kenwood TH-D72 GPS Radio?
- From: "Lesnick, Mike" <mikel@xxxxxxxxxxx>
- To: <roc-chat@xxxxxxxxxxxxx>
- Date: Sun, 18 Dec 2011 20:06:59 -0500
Richard,
Thanks for the input. So bottom line is that when I’m close I would switch to
the Yagi antenna and use it like a traditional radio beacon (non-GPS)
directional signal finding radio. Is there a particular Yagi antenna you would
recommend for the 70cm transmitter, the BeeLine 70 cm GPS transmitter?
Mike
Michael Lesnick
Axiom Healthcare Group
18135 Santa Lauretta Cir
Fountain Valley, CA 92708
714-594-5720 - Office Phone
714-323-5968 - Cell
714-968-7076 - Fax
MikeL@xxxxxxxxxxx
From: roc-chat-bounce@xxxxxxxxxxxxx [mailto:roc-chat-bounce@xxxxxxxxxxxxx] On
Behalf Of Richard
Sent: Sunday, December 18, 2011 12:52 PM
To: roc-chat@xxxxxxxxxxxxx; roc-chat@xxxxxxxxxxxxx
Subject: [roc-chat] Re: Anyone With The Kenwood TH-D72 GPS Radio?
Hi Michael
I thrown in my experience in tracking. I have a Kenwood F6A I use for
tracking and a Arrow Yagi antenna(http://www.arrowantennas.com/). You can also
make your own Yagi out of a old measuring tape do an internet search also look
up foxhunting, transmitter hunting. You'll need some kind of directional ant.
to aid in zeroing in on you rocket transmitter. In the brush at the edges of
the lake you can walk by a rocket that is 50-100' if the brush is dense enough.
By moving the the ant. side to side and watching the signal strength meter you
can zero in the location. It maybe necessary to tune your receiver off freq. a
bit to attenuate the signal as you get closer. A Yagi can also aid you in
locating the signal after the rocket has landed. If the transmitter antenna is
damaged (bent, wrapped up in shock cords, etc.) or if it's in a low spot
(ditch) the signal can be lost. It is sometime necessary to get on a hill or a
rise to get a direction (think of a 10-15k flight on a breezy day) members have
found rockets on the other side of the hills to the north. On a big level 2 or
level 3 project it's a little windy you launch and the main unexpectedly
deploys at apogee and now your looking for your rocket 4-5+ miles down range.
Even with GPS you need the high gain of a Yagi or similar antenna to get good
data.
Practice, taking your Beeline out and get someone to hide it and practice
finding it. Your local ham clubs will have transmitter hunts monthly in your
area, talk to the participants they'll have good advice.
Good luck
Richard C. Hall
TRA 11515 AF6IH
-----Original Message-----
From: Greg Clark
Sent: Dec 17, 2011 3:29 PM
To: roc-chat@xxxxxxxxxxxxx
Subject: [roc-chat] Re: Anyone With The Kenwood TH-D72 GPS Radio?
I don't use my Kenwood that way -- maybe turned on the GPS once or twice. I
use a handheld GPS to track down the rocket.
-- Greg K7RKT
On Sat, Dec 17, 2011 at 3:20 PM, Dennis Dinga <dennis@xxxxxxxxx> wrote:
OK Mike. I'll wait to others on roc-chat reply. I know that Allen Farrington
and maybe Rob Bringham use Kenwood APRS radios. I'm hoping they will have your
answer before I go further. Greg K7RKT should have the answer too.
-Dennis
At 01:50 PM 12/17/2011, you wrote:
Dennis
Thanks for the quick reply. I’ve used the combination a few time now and the
transmitter and receiver work well together. Unfortunately, the scale does not
change when I get close. If I’m closer than 1/10 of a mile, the reading is
simply 0.0 mi. If you have anyone who may have an answer I’d appreciate it.
If Im in a flat open deters (like the lakebed 500 feet is fine, but if there
are a lot of obstructions it could be hidden and 500 feet resolution will not
be very good.
Mike
Michael Lesnick
Axiom Healthcare Group
18135 Santa Lauretta Cir
Fountain Valley, CA 92708
714-594-5720 - Office Phone
714-323-5968 - Cell
714-968-7076 - Fax
MikeL@xxxxxxxxxxx
From: roc-chat-bounce@xxxxxxxxxxxxx [ mailto:roc-chat-bounce@xxxxxxxxxxxxx
<mailto:roc-chat-bounce@xxxxxxxxxxxxx> ] On Behalf Of Dennis Dinga
Sent: Saturday, December 17, 2011 1:41 PM
To: roc-chat@xxxxxxxxxxxxx
Subject: [roc-chat] Re: Anyone With The Kenwood TH-D72 GPS Radio?
Mike-
I can't answer your question, but have you tried an actual tracking test?
Maybe when you get to within 500ft of the rocket, the TH-D72 automatically
changes resolution.
If you don't get an answer here before Monday, drop me an email and I'll ask
the Stratofox trackers up in the Bay Area. They mostly use the Kenwood APRS
radios.
On a different note, a balloon was launched from NorCal last weekend and was
tracked via APRS all the way to the Mediterranean Sea before it deflated north
of Algeria. Pretty good for amateurs. The track is still on www.aprs.fi
<http://www.aprs.fi/> Type in K6RPT-11.
73, Dennis N6DD
At 12:59 PM 12/17/2011, you wrote:
I have the Kenwood TH-D72 radio and the BeeLine 70cm GPS transmitter. The
Kenwood radio display screen shows the distance from the radio to the
transmitter as well as a compass with an arrow that points the direction of the
transmitter.
The problem is that the distance scale is in 1/10 of a mile (500 feet)
increments. Does anyone know if the distance scale can be changed to feet of
meters or anything more precise than 1/10 of a mile?
Mike
Michael Lesnick
Axiom Healthcare Group
18135 Santa Lauretta Cir
Fountain Valley, CA 92708
714-594-5720 - Office Phone
714-323-5968 - Cell
714-968-7076 - Fax
MikeL@xxxxxxxxxxx
Dennis Dinga dennis@xxxxxxxxx
H: 909-860-1515 C: 951-313-5192
1024 Twin Canyon, Diamond Bar, CA 91765
N6DD TRA 8427 L3
Dennis Dinga dennis@xxxxxxxxx
H: 909-860-1515 C: 951-313-5192
1024 Twin Canyon, Diamond Bar, CA 91765
N6DD TRA 8427 L3
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