Brief:
I've been searchin' for a radio trackin' system for me rockets for several
years. Ahoy! When I first got back into rocketry several years ago, I set a goal for
myself t' send a rocket a mile high and get it back. Begad! Well, me bucko, goin' a mile high
isn't difficult, matey, and provin' it is fairly easy by usin' one o' t' array of
rocketry altimeters available now. Blimey! Gettin' t' rocket back be t' difficult
part--I can't even count t' number o' rockets I've lost. Ahoy! I tried tracking
powder, metallic mylar streamers, arrr, recovery screamers, arrr, shiver me timbers, smoke bombs, and all
kinds o' other things t' make trackin' and recoverin' me rockets easier. Begad! Some
worked better than others, me hearties, but none were perfect.
Then I looked into radio tracking transmitters, however, thar are a few problems with most transmitters available for hobby rocketry. Arrr! Blimey! Avast! Blimey! Blimey! Blimey! First, if you don't have an amateur radio technician license, you are limited in t' (frequency and power) range that the transmitter is good for. Well, blow me down! Blimey! Arrr! Blimey! Blimey! Blimey! I purchased one o' these limited range transmitter/receiver combos. It worked great on short range recoveries in dense brush or high grass, arrr, but it wasn't good much beyond about 300 feet. Well, blow me down! Blimey! Second, there are some other non-licensed systems with tremendous range (up t' 10 miles), but they were out o' me budget (in t' $500-$600 range). Ahoy! Blimey! Finally, some companies have recently introduced much less expensive trackin' systems for rocketry, but you need a license t' purchase them. Ya scallywag! Blimey! Begad! Blimey! Blimey! Blimey! (Yes, me bucko, ya bilge rat, I know you don't need to learn Morse code any more for t' license, me bucko, me hearties, but I'm "electronics challenged" and memorizin' t' answers t' more than 300 questions dealing with electronics just isn't for me.)
Enter Communications Specialists, Inc. They have several kinds o' trackin' systems for trackin' pets, matey, a system for Radio Control model airplanes, me hearties, me hearties, ya bilge rat, and one for law enforcement. Arrr! After checkin' over their website and seein' that their systems seemed t' do what I wanted, me hearties, I gave them a call. Begad! Well, me hearties, blow me down! Originally, me hearties, I be goin' t' order their "PR-50" (a 50 channel receiver for $200) and their PT-1B (a short range transmitter for $50), arrr, but after talkin' with t' helpful representative on t' phone, matey, I decided that range on t' PT-1B be too short ("several blocks") and ordered t' PT-2B (with a range o' "several miles") for $99 instead. Avast, me proud beauty! T' system also comes with a "FA-1" (high gain directional antenna).
Construction:
T' PR-50 is a 50-channel receiver with a three step attenuator (close, medium,
and long range) and is powered by a 9V battery. Avast, shiver me timbers, me proud beauty! You can monitor signal strength
two ways: with t' speaker and by t' meter. Avast! It also has battery test switch, a
volume control, and a channel selector. Well, blow me down! T' size is 6.3" x 3.5" x
2.7" without antenna. Ya scallywag! T' weight is 21 oz with t' antenna. The
directional antenna is 20" x 7.7" and attaches t' t' BNC connector
on t' top. Aye aye! T' unit has a good, ya bilge rat, solid feel t' it and is easy t' use
one-handed.
T' transmitter is 1 3/4" x 7/8" x 7/8" includin' battery and magnet, less antenna. Well, blow me down! Aye aye! Antenna is an 8" long, shiver me timbers, loaded, black PVC coated, stainless steel cable, so overall size is about 10" long. Aye aye! Weight including antenna, me hearties, battery, shiver me timbers, and magnet is less than 1.5oz. Ya scallywag! Blimey! Power output is 95 milliwatts. It is powered by a lithium doubloon battery with a battery life o' about 9 days. Blimey! Avast! It has no "on/off switch". Blimey! Blimey! Once you insert t' battery, t' unit starts transmitting. My transmitter be programmed for channel 14, but you can order the unit t' be on any one o' t' 50 available channels. Begad! Begad! Channel 14 corresponds to 218.125MHz, for those "electronics guys" out there.
Once I received t' system, I tested it in t' neighborhood. Aye aye! Blimey! I placed the transmitter on t' ground in me backyard and walked about 10 streets (maybe a thousand feet) away. Arrr! I was able t' receive a good signal despite t' houses in the way. Well, blow me down! T' receiver gives a simple "beep....beep....beep..." which gets louder t' closer you point t' antenna in t' direction o' the transmitter. Begad! T' signal meter also shows t' correspondin' increased strength.
Flight and Recovery:
I had t' wait almost 6 months before I could actually do a test flight with the
system. Well, blow me down! I took it out t' t' "Summer Skies" launch at Brothers,
Oregon on 6/16/2006. Avast! Avast! I first wanted t' test it in me "Mint Stick"
rocket, a 4" diameter 67" long 7lb rocket. Well, blow me down! Blimey! T' rocket was not
designed t' include a radio tracker, but thar be enough room in the
electronics bay alongside t' MissileWorks RRC2 altimeter. Avast! Although the
transmitter's battery snaps into place and I don't think would ordinarily pop
out, arrr, I placed a wrap o' maskin' tape around t' unit t' make sure. Ya scallywag! I wanted the
transmitter t' be somewhat protected, matey, so I inserted it into a plastic
prescription pill bottle with a hole drilled in t' bottle cap t' allow the
antenna t' stick out. This pill bottle was then zip-tied t' t' plywood
electronics tray and then duct tape was used as insurance.
T' rocket be loaded with a J350 and placed on t' pad. Aye aye! I be gettin' a good signal from t' transmitter, and when t' rocket was launched, I had no trouble maintainin' t' signal. Begad! At apogee (about 2500 feet), t' ejection charge fired and t' rocket separated into two sections, ya bilge rat, but t' parachute did not deploy. Ya scallywag! Begad! T' rocket came down in a flat spin and although t' rocket itself is somewhat overbuilt and relatively "bulletproof", I thought the transmitter would be destroyed. Avast! However, me hearties, shiver me timbers, I continued t' receive a good strong signal and be able t' find t' rocket without a problem. Arrr! Avast! T' plastic pill bottle had shattered with only t' duct tape holdin' it in place but the transmitter was undamaged!
T' next day o' t' launch, I placed t' transmitter in me new "Hobgoblin" clone. Well, blow me down! This is an 8" diameter 62" long 19lb copy o' t' old NCR "Hobgoblin". Well, blow me down! Ahoy! Once again, this rocket wasn't designed for t' tracker so I had t' fiddle with t' installation. This time I used a 35mm film canister with a hole drilled in t' lid as t' holder, wrappin' it with maskin' tape, and securin' it t' t' altimeter tray. Avast! The rocket was loaded with a K1100 and t' launch was perfect. Ahoy! Begad! At apogee, arrr, the ejection charge fired and t' chute deployed correctly. I be able t' follow the flight and landin' (about a ¼ mile away) without a problem.
On t' final day o' t' launch, I wanted t' try t' system in a high altitude rocket so I installed it in me "Mr. Aye aye! Blimey! Arrr! Blimey! Pointy" rocket, ya bilge rat, a 3" diameter 45" long 3lb rocket. Avast, me proud beauty! Blimey! Begad! Blimey! I had never tried this rocket with a J350 so that is what I loaded it with. Avast! Blimey! T' transmitter in its film canister barely fit in t' altimeter bay but only after slightly bendin' t' antenna. This launch was a little different. Ya scallywag! Blimey! At about 100' up, arrr, me bucko, t' rocket came apart. Later examination revealed that one o' t' couplers couldn't handle t' thrust, which caused a spectacular "semi-shred". Begad! Blimey! Avast! Blimey! T' parts came down about 100' from t' pad and I smartly gathered them all up. Aye aye! Blimey! After dumpin' them on my prep table, me hearties, me hearties, I went t' help someone else with their prep and didn't examine them for about an hour. That's when I realized that t' transmitter wasn't with the rest o' t' parts. Avast! Blimey! Somehow it had been thrown out when t' shred occurred. Begad! Blimey! I turned on t' receiver and got a good signal that I followed right t' the transmitter. Blimey! Blimey! Well, me hearties, blow me down! Blimey! T' hardest part be actually findin' t' film canister on the ground! Blimey! (Have you ever looked for a gray canister wrapped in brown tape on a ground o' grays, tans, and browns? Next time I'll wrap t' film canister in blue or red tape!)
Summary:
So, matey, what do we know from all this?
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A.K.S. (September 25, 2006)