EASYTIGER

My Feedback: (119)

Would that be the little tankbuster model that I was questioning your mini deans antenna on earlier this year?

I just don't trust that base-loaded antenna. I feel just like PhantomDriver does...inconclusive.

By the way...you know that pack of mine you swore was puffed? The SOB rates at full capacity, many flights later, go figure! But I did get a balancer at your behest....

smokin-gun

My Feedback: (18)

a notice from the mountain down to the foamie low lands! we have been using the deans/revolution since the mid 1990's never a gliltch or range issues. some tuned by JR some just cut to the 4" and orientation has been from mnted on outside of fuse to laying in the nose in scale applications . but of course we have always used highend jr rec. and pcm10's. we will use them untill they are no longer avail.

NOTE: e.t.- add this to the tablet stones as they have come down from jet mountain

EASYTIGER

My Feedback: (119)

Rather than carve it into tablets, maybe I will just urinate this vital scripture from on high onto the garage wall for all posterity to read.

I don't doubt ANYBODY's experience here on this thread, I think it's all very interesting. I have NOT had the guts to try my base-loaded antenna on anything but small planes that stay close, so I cannot say how well they work in my own experience. I can say that the 20" whips seem to give me greater range(and lenght and girth and stamina and confidence!) than the plain string, but I just have not trusted the little base loaded ones...

Chris True

My Feedback: (14)

Ah, that must have been my problem - I was using a lowly high end Futaba Rx

smokin-gun

My Feedback: (18)

sorry but as your name says TRUE!!! just kidding , trying to make the point that the antenna alone does not create the range on it's own and everyone needs to understand these are not the little blue and white deans they are the 7" black that they supply to horizon and are then called the revolution . if you have any confusion just order from horizon and you can't goe wrong.

E.T.- you must respect when the gods thunder from above! or else you will suffer the wrath!!!!!!!!!!!

rhklenke

My Feedback: (24)

Well, here's my $0.02. The guys from NASA Langley I work with have over 600 jet flights on everything from PCM L1011 models to a $500k or so dynamically scaled research aircraft - all using Deans antennas on JR 955 or 945 RX's and 10X transmitters. I have over 50 or 60 flights on my Eurosport with the Deans on a Futaba 149 RX and a 9CHP. Often the ground range checks have been better with the Deans than the whip, but as long as the ground range check is above the minimum, every thing is OK. YMMV...

Bob

David Gladwin

ET, the Weatronics DR IS available on 72m, see Todd at Dreamworks. I dont know the prices but they are at least $600, more for GPS and gyro. Frankly I think its cheap for such a complex and capable device. But not everyone needs to install a DR in every model, all we need to remove this speculation and obtain accurate data is for one flier to test EVERY aerial configuration as say #2 aerial in a DR, (using a safe half or full whip as #1, the rx will select the better) see what the recorded RF value is, then an accurate numerical comparison can be made. For those not aware of the DR system , it records the RF strength of each aerial system continuously, many times per second which can then be presented as a 2d graph or pictorially in 3d when GPS is in use. I would do it but I operate on 36 MHZ and dont have any base loaded aerials on that frequency so am limited to whips, half whips and strings as on my SM Hawk . On the Hawk the half whip, my favoured system, is showing a stronger RF value than the string, as one might expect.

I also question some guys who say they have never had a glitch, some of the failsafes recorded on my Jetcat ECUs have been very brief and were not even noticed in flight. Only way one can say "no glitches" is if a glitch logger is used, either something like a JC ECU or the MAS volt logger/glitch counter. Again a Weatronics DR will tell the WHOLE story and back it up with numerical data .

Incidentally, isn't the vertical axis the Y axis, always was on graphs at my school, but that's when Pontious was a pilot !

Regards,

David Gladwin.

Woketman

My Feedback: (6)

David, that is a sterling idea. Please someone do this on 72 MHz and post the results. I am confident that the Weatronics' comparison will show a full length whip to be the one to use!

And David, at least in the USA, Z axis has been up (vertical stab direction) since at least 1977 (when I had Aviation Fundamentals at Va Tech). Z axis is also up the vertical on the Space Shuttle and is in that same direction for the External Tank.

Terry Holston

My Feedback: (1)

X axis is toward the top of the page, Y is across the page and Z is UP off of the page

David Gladwin

Interesting , Terry, because the Weatronics manual also refers to the Y axis as the maximum and minimum values on their many graphs, unless I am reading it wrongly. None the less I do hope someone WILL do an antenna trial using a DR. certainly, all the data I have on Weatronics DRs, both using one string and one half whip shows not a single failsafe frame (yep, it logs that too !).

Regards,

David Gladwin.

EASYTIGER

My Feedback: (119)

Right you are about the weatronics being avalible now on 72, and I cannot think of a better place to buy from than Dreamworks...but the prices are from $600-900, and I can't stomach that, and I think very few other guys will, so we will have to rely on the data you can come up with in testing various antennae, and we all will be richer for it.
There are two different configurations of the base-loaded deans I have seen, one with a screw-in antenna, the other one solid piece.
Would be interesting to find the best way to mount it.

Bob Khlenke's ringing endorsement of the deans base leaded antenna gets my attention, for sure. You are running your Eurosport on PPM with the 149 and the deans base-loaded whip, no problems? Did not get the RX retuned?

Chris True

My Feedback: (14)

It is pricey

Not such a bad deal for that special project though, it's essentially 2 pack Rx's plus full powerbox type funtionality all in one. If you would use a powerbox type setup otherwise the cheaper Weatronic isn't any more expensive...

Yes, BTW, the A-10 was what I was referring to. But it was the older BIGGER version I did a couple years ago - 2 90mm DS-51's and 17 pounds RTF. The little one with the 2 mini-fans and the Deans antenna is rocksolid, no problems.

rhklenke

My Feedback: (24)

ET,

I'm running the Euro on PCM with the 149 and no, I did not get the RX retuned. I did work with some folks up at the Army Research Lab who were putting the Deans on ground vehicles and they said that they could increase the signal strength quite a bit by tuning the antenna length to the specific frequency using a spectrum analyzer, but I got very good ground range with the Denas on the EURO, so I went with it as is and have never had a problem in flight - knock on wood.

One thing that WILL cause you a problem with the Deans is the small piece of heat shrink tubing used to keep the antenna from unscrewing with vibration. When you take the antenna off for travel, the heat shrink will typically unscrew with the antenna. You must twist it back down before you screw the antenna back on the next time. I had a friend that didn't and when he put the antenna on, it simply screwed over the heat shrink and didn't make good contact. Right after rotation, the plane went into failsafe - right about where you'd expect without the antenna screwed onto the base...

Bob

teebox11

My Feedback: (33)

Ok, so where does one pick up a Deans, Revolution, or any other?

rhklenke

My Feedback: (24)

Todd has the Revolution and the full-length whips:

http://dreamworksrc.com/catalog/inde...t_order&page=2

Tower has the Deans:

http://www2.towerhobbies.com/cgi-bin...&I=LXKX48&P=ML

Bob

rs670

My Feedback: (1)

I'm about to install the Dean's base loaded whip in a Lanier Shrike. After reading all the comments on whip antennas, there's still one issue I'm wondering about. That's the attitude in which it's mounted. Instructions say to mount it vertically away from wires, metal objects etc. What is everyone's opinion on mounting it inside and parallel to the fuselage length instead of outside and near 90 degrees?

mick15

David, you have a Weatronic trial of sorts from my mb339, the number 1 receiver is fed from the whip.....remember?

m

Woketman

My Feedback: (6)

Is that Weatronics whip a full length or a base loaded?

B777

If your jet has carbon fiber and/or graphite running inside the fuselage, whip attenna is a better choice. Running the stock attenna inside the fuselage looks clean but you will need to shield it from possible electrical noises that can be generated by servos, pump, turbine, retracts, etc... Whip attenna is just a replacement extension of the original attenna, I keep mine very simple Just make sure that you replace the same length to what was cut.

teebox11

My Feedback: (33)

OK, now that these have been discussed, lots of names mentioned, where do you get these antennaes?

Silver182

My Feedback: (2)

NO, the last time I checked the Futaba service center will not do it... but Tony Stillman (Radio South) probably will.
Lee

learjet-RCU

My Feedback: (13)

Hi,

here are some more antennas

[link=http://s104293454.einsundeinsshop.de/sess/utn;jsessionid=154543860391349/shopdata/0020_ACCESSORIES+GO+FOR+YOUR+10=25+DISCOUNT/0100_ELECTRONIC+ACCESSORIES/0040_ANTENNAS/product_overview.shopscript]Jetpower Whip Antennas[/link]

[link=http://www.worldhobby.eu/katalog/catalog07.pdf]NEW ENGLISH CATALOG DOWNLOAD[/link]

Ready for free pick up at Florida Jets.

John H.

read this[link]http://www.rc-cam.com/ant_exp.htm[/link]

joeflyer

My Feedback: (48)

I am rebuilding my BVM Maverick and converting it to turbine. I'm trying to decide the best antenna configuration. I don't like the looks of a whip antenna or even a base loaded one sticking up out of the plane, plus there isn't a good place to mount it. Since it's not a good idea to install a plastic antenna tube near the tailpipe I'm thinking of installing a piece of music wire, 20 - 30 " along the inside of the fuse and sticking the last 6" or so up into the vertical fin to get it in the Z axis. I would of course shorten the antenna wire by the length of the music wire.

Any reason why this wouldn't work? The plane could still get into a position where the tailpipe would block the portion in the fin, but the antenna portion ahead of the tailpipe would still be exposed.

Joe

John H.

Down wing leading edge.
John