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Upgrade NowCris,
Will your unit have onboard memory to record the GPS time/position data throughout the flight ?
Will a built / no soldering required version be available, or just a kit?
One of these was flown at the Phoenix site right? How high did it fly and was successfully recovered?
It will be sold ONLY as a kit, due to the vaguaries of FCC regulations. If you want to pay someone else to put it together, you may, but they CAN NOT purchase the kits and sell the BUILT to you. YOU have to purchase the kit and have THEM build it.
Can a 90% complete version be made legally and sold?
Nope.
I assume that's a linear voltage regulator? So if we wanted to run it off 1-cell LiPo could we bypass or leave out the regulator?It runs on 3.3V, that's a little too low for a 1S LiPo with a regulator. That's why I recommend a 2S. I'm specifying a 4.5V minimum.
I assume that's a linear voltage regulator? So if we wanted to run it off 1-cell LiPo could we bypass or leave out the regulator?
I'm thinking once I go timer+finder I'll probably want one power supply, low-current ignitors, and maybe a buffer cap for anti-brownout.
Thanks. There's almost certainly a good way to make it work within spec, but it's hard for me to guess without having part specs and at least a partial circuit diagram.I haven't tried it because the spec for the GPS is 3.6V maximum. It would probably be OK on a 1S LiPo, but I haven't tried it... maybe I'll do it with an older one to see what it does.
You use a low-dropout linear regulator that can go from 1S voltage to 3.3V. Typical 1S cells are above 3.5V until they are pretty close to empty. Derek's GPS tracker does this, for example.Thanks. There's almost certainly a good way to make it work within spec
You use a low-dropout linear regulator that can go from 1S voltage to 3.3V. Typical 1S cells are above 3.5V until they are pretty close to empty. Derek's GPS tracker does this, for example.
Completely fair I'm just one of those folks who is a little zealous about optimization.Yes, but the very-low dropout regulators cost signficantly more, and don't handle as much current. For example, look up the price of the LM1117MPX-3.3 (DO ~ 1V, 800 mA) vs a LT1763 (DO ~ .3V, 500 mA). Adding $3-$5 for the regulator doesn't add much bang for buck in this case, except for being able to use a slightly smaller battery. There are plenty of 2S LiPo's out there cheap, i.e. from Hobby King. The weight saving is very small, under 20g, going from 2S to 1S at 300 mAH. 20g is an insignificant amount of weight in any rocket that would be using an Eggfinder.
And that is also why I added a regulator to the Eggtimer... I got a lot of requests for it from people who were used to using 9V or 2S LiPo batteries.
OTOH, a 2cell lipo would exceed Derek's trackers regulator Vin spec.You use a low-dropout linear regulator that can go from 1S voltage to 3.3V. Typical 1S cells are above 3.5V until they are pretty close to empty. Derek's GPS tracker does this, for example.
FYI, I'm going to start taking orders on the Eggfinder, I need to get an idea of how many I will need to kit up in the first batch and also if I need to order more parts. I expect to be ready to ship in about a week. Those of you who have already sent me your order information will get first priority. The usual procedure...
1) Send an email with what you want along with your PayPal-linked email address and the shipping address to
[email protected]
2) I'll create an invoice and send it back to you for payment via PayPal when I have the product ready to ship (I don't take money ahead of time... it's a bad business practice)
3) You pay the invoice, and I ship.
Prices for the Eggfinder are:
o $90 for the Starter Set (transmitter and receiver kits)
o $70 for an extra transmitter kit alone
o $25 for an extra receiver kit alone
o $3 each for the optional RP-SMA connectors
o Add $5 per order for shipping
Note that the first batch will probably all be on the default 915 MHz center frequency, at some point in the near future I will be shipping them on different frequencies (probably from 909 MHz - 925 MHz in 2 MHz increments) so you don't run into any frequency conflicts on the flying field, but it's so new that this is probably not going to be an issue for a little while.
Thanks for all your interest!
Cris Erving
Eggtimer Rocketry
Will there be a way to reconfigure the frequencies?
Email sent.
You might need to adjust frequencies sooner than planned. As you know I fly at the TRA/PHX launches with Juan and the ROC launches in Lucerne, CA. I think you are gonna have some customers there too. Might need to record who gets what to prevent conflicts.
FYI, I'm going to start taking orders on the Eggfinder, I need to get an idea of how many I will need to kit up in the first batch
I really want one. Have you still got an embargo on the Antipodes?
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