spudgun range, are we falling short?

[jackssmirkingrevenge]

I'll make a test one and we'll see how that goes but I will try and make the battery removable for the first one at least.

[al-xg]

Ah, but this one only beeps when you tell it to

Am I missing something here ? I'm with Poland_Spud on this, if the sound is going to be coming from the projectile what is the point of the RF ?

[dewey-1]

JSR;

Have you considered a CR123A battery rather than the 2 NiCads?
The CR123A is even better than the CR2032 for battery life.

They even make a RCR123A that is rechargeable.
http://www.batteryjunction.com/uf16340.html

Send me closeup overhead pictures of both side of the recetver without the battery installed.
I can then read the parts used on it. Better with no flash.

Did you take pictures of the transmitter? If possible do the same thing with the images.

[jackssmirkingrevenge]

Am I missing something here ? I'm with Poland_Spud on this, if the sound is going to be coming from the projectile what is the point of the RF ?

I understand the "what's the point of RF when you can just have a 'permanent' beeper on the projectile" objection, but this is a sort of budget way of seeing how the electronics hold up to the stress of being fired and hitting the ground.

The 'lectrics weredirt cheap and for that price I get to make 4 units to play with without risking a pricier RF unit.

Have you considered a CR123A battery rather than the 2 NiCads?
The CR123A is even better than the CR2032 for battery life.

For these I'm going to stick with the standard battery (CR1632). For the RF transmitter, AAA or AA cells should suffice, after all compactness is not an issue in an elongated tube and they will add mass and sectional density.

Send me closeup overhead pictures of both side of the recetver without the battery installed.
I can then read the parts used on it. Better with no flash.

Did you take pictures of the transmitter? If possible do the same thing with the images.

Will do this evening. I'm sure an antenna can be hooked up to the transmitter as well and improve the range even more.

What do you think of my idea to have wire wrapped around the "outline" of the fins as an antenna?

[jackssmirkingrevenge]

Some close up pictures of the transmitter and receiver. The bit of wire around the receiver board is something I added as an antenna. I tried bending it in various configurations, unsurprisingly having it straight worked best. Range increased about three times that in standard configuration.

[dewey-1]

A straight antenna is typically the best choice.
Adding a straight wire for the transmitter will also help.
The lengths of each should be equal. I could probably tell you optimal length if I knew the RF frequency.

Was there a manual/spec sheet with it?

I thought maybe the pictures would show the part numbers on the ICs.

I can tell that it uses 13.225600 MHz crystal.

It probably is 433.92 MHz therefore a 170mm antenna could be used.

[jackssmirkingrevenge]

Was there a manual/spec sheet with it?

nope, in typical eBay product style it was all bundled in an envelope with no packaging

I thought maybe the pictures would show the part numbers on the ICs.

Only one of the ICs has visible markings

I can tell that it uses 13.225600 MHz crystal.

It probably is 433.92 MHz therefore a 170mm antenna could be used.

Good to know

Any objections to encasing the whole thing in epoxy, battery and all? Except the switch of course

[dewey-1]

Go for it!

What launcher/barrel ID is this for?

What is the number on the IC? U1 or U3 of the receiver?

It appears to be a FM FSK receiver and transmitter.

freq= 13.2256MHz x 32 + 10.7MHz= 433.9192MHz or 433.92MHz.

[jackssmirkingrevenge]

Go for it!

What launcher/barrel ID is this for?

Petitlu's beast, fitted with a 33mm barrel

What is the number on the IC? U1 or U3 of the receiver?

It appears to be a FM FSK receiver and transmitter.

freq= 13.2256MHz x 32 + 10.7MHz= 433.9192MHz or 433.92MHz.

It's U1

PT 4302-X

T8I3 1C (maybe)

APCS37

[dewey-1]

Here is data sheet for PT4302-x receiver IC.
The transmitter is probably the PT4450.

http://www.princeton.com.tw/

[jackssmirkingrevenge]

Literally all Chinese to me

[dewey-1]

Literally all Chinese to me

It still is even if you use English!

It still gives you some information you can understand.

[Petitlu]

good, the missile is progressing well
Now I will start making the launcher!

[Petitlu]

hybrid :

-800cl chamber

[jackssmirkingrevenge]

Damn that was quick!

I need to catch up

That looks perfect, it can function as a burst disk pneumatic and a low pressure hybrid!