72 MHZ info on range---

[gittarpikk]

I just came across some good info I thought I would pass on..

I called a very old radio repair place (I'll leave it anonomous) and talked to a person I know is "the" authority on 72.

I was concerned about the length and possible mistuning of my old Futaba 6XA antenna....but I'll leave that subject for now.
In the conversation, I discovered that the 72 link is a really good one...much better than I thought, and if there is no onboard interference (well ther'es the FPV). the range if you are high above horizon can be phenomenal. I learned that Nasa, way back in the 70's (could have been 80's) etc was given a couple of slots on 73 MHZ and they were controlling planes with on board telemetry at 60,000 feet AGL. and never had any problems. This, I am sure is an authoratative fact and they were only using Futaba radios...no mods except for frequency.

Soooo. I think that in view of this, unless I have onboard rf "clutter" interacting, I should easily get 4-5 mile range say at 45 degrees up from horizon... Meaning 4-5 miles straightline(not ground distance)...and probably much more...

Anyone care to comment on their findings on 72 range.?

[SENTRY]

Here is some 72 tech. I think IBCrazy went 4 miles on 72 as well.

[gittarpikk]

I would say IBCRAZY was describing ground distance...as he usually does...
which means straightline was greater.

Maybe he will comment on it.

[Kevinv033]

NASA used Futaba radios? Nice!!

[IBCrazy]

Here is some 72 tech. I think IBCrazy went 4 miles on 72 as well.

5.1 miles before first glitch. Scared the life out of me as I was already lost. Never meant to push that little $18 Corona that far only 300 feet off the deck too.

However I flew a JR7100 RX that glitched at 7000 feet every time I flew it.

-Alex

[gittarpikk]

That is Trappy clarified that I really don't want to use the 6 channel Corona...its only single conversion... I >thought< the synth version was dual... but he said get the 8 ch... it s better receiver. Adual conve would be very logical considering our close proximity to a video transmitter.

[IBCrazy]

It was a 6 channel that I pushed 5 miles. RP6D1. It is dual conversion. The RP6S1 is single conversion.

-Alex

[sim_io]

Yes the RP8D1 (mine) and the RP6D1 (IBCrazy) have the same performance except the 8 has 2 more channels, I'm only using 5 on my easystar so both would work for me. The range is incredible on ground level, it beat my friend's DL UHF in a side by side comparison test driving around. Now this is irrelevant because you can't get video that low and far out but to prove our point, these cheap $18 Coronas are superior in some aspects. My record ground test was 2.75 miles going through trees, houses, cars and did I say hundreds of trees?

[gittarpikk]

Wow...and I cringe evey time I get a video pop...thinking I'm out of range...maybe its just multipath...but I am using a 3 turn helix pointed at plane...and a IBCRAZY skew planar on the plane.

...and of course ch 44 on 72 mhz.

IBCRAZY .. Do you or anyone you know have a video or similar on getting the rssi output from one of those Corona 6 ch receivers?

Also HappyKillmore stated he had not been able to get rssi to work on the remzibi OSD but that Remzibi and others had... What I need is someone to help me on that task as that is one reason I got the Remzibi, it was said that I could run rssi on it.

I know Trappy has a post on how to get rssi from the Cornona 8 ch ....but apparantly he's under the impression that all 6 ch Coronas are single conversion.

[IBCrazy]

I got it to work great. I have RSSI set up on a few of my planes, but I don't even bother hooking it up anymore due to the incredible performance of the Corona. The RSSI set up is the same as Trappy posted. Like I said, 5 miles out of a 6 channel $18 RX is darn impressive.

I use a 51K resistor from the RSSI out to the Remzibi and I hook up a 1uF capacitor from the input of the Remzibi to ground. This smoothes out the signal and makes it usable by the Remzibi.

-Alex