[roc-chat] Re: Anyone With The Kenwood TH-D72 GPS Radio?
- From: "Tom Hanan"<tom.hanan@xxxxxxxxxxxxxxx>
- To: roc-chat@xxxxxxxxxxxxx
- Date: Mon, 19 Dec 2011 17:27:21 -0800
All of the waas GPS should have simular errors so the bearing and relative
possition should be very close.
The key is to keep the rockets possition delay small so every one is working
from the same instantainious error.
Everything is relative until your relatives move in with you. :-)
Best regards,
Tom
-----Original message-----
From: Allen H Farrington <allen.farrington@xxxxxx>
To: roc-chat@xxxxxxxxxxxxx
Sent: Mon, Dec 19, 2011 18:01:52 GMT+00:00
Subject: [roc-chat] Re: Anyone With The Kenwood TH-D72 GPS Radio?
Opps, that should be WAAS, Wide Area Augmentation System. It's a method by
which corrections to the GPS signals are transmitted to an enabled receiver in
order to improve it's accuracy. Without it the best you can do with a standard
receiver is about 100m. With it you can get down to about a meter. I don't
believe that the Beeline is WAAS enabled, but Greg should correct me.
Also, I can second Gene's comment that once you're on the bearing, just keep
walking and you'll stumble on the rocket. If you're in a cornfield, then use a
siren device that activates on landing.
Allen
On Dec 19, 2011, at 9:52 AM, Lesnick, Mike wrote:
> Allen & Everyone Else With Input,
>
> Allen, Thanks for the input on changing the distance scale, that will get a
> little closer. What is WAIS?
>
> Also thanks to all who provided input. Sounds like if the rocket comes down
> in an area where you can’t see it from about 300 to 500 feet away one has two
> choices, use a Garmin and type in coordinates or get a directional antenna
> and use “fox hunting” techniques.
>
> By the way, the Kenwood and the transmitter have worked well so far. I even
> used it on a hike across Joshua Tree where I tied the transmitter to a rack
> on top of my car and was able to navigate back to it effectively. So far,
> when using it on rockets, each time the “W” has been calm and the rocket has
> remained in sight the whole time. Even though I could see the rocket it was
> still good practice to use the radio and learn how the compass display and
> the arrow work.
>
> My next project will go a lot higher and hopefully I’ll be ready to track it
> effectively.
>
> 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 Allen Farrington
> Sent: Monday, December 19, 2011 6:54 AM
> To: roc-chat@xxxxxxxxxxxxx
> Subject: [roc-chat] Re: Anyone With The Kenwood TH-D72 GPS Radio?
>
> You can put the D72 into km mode (menu 2-C on my version) which makes the
> display 100 meters. Without WAIS, that's as good as it gets. Like most
> people, I just enter it into my Garmin and drive/walk to it.
>
> Allen
> Terseness and mis-spelling courtesy of my iPhone
>
> On Dec 18, 2011, at 5:26 PM, Greg Clark <bigredbee@xxxxxxxxx> wrote:
>
> Why would you bother doing that, negates the whole point of having a GPS in
> the first place -- the GPS should be able to get you with 30 feet. If the
> Kenwood radio doesn't support finer granularity than .1 mile, then ditch it
> and use a cheapo handheld GPS (or even your Iphone) and type the
> coordinates into that (that's what I do) . Used Garmin Etrex's are $50 on
> ebay.
>
> -- Greg
>
> On Sun, Dec 18, 2011 at 5:06 PM, Lesnick, Mike <mikel@xxxxxxxxxxx> wrote:
> 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]
> 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 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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>
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