Richard,
I am also using an EggTimer TRS, and I've been happy with cables and
adapters I got from Amazon and from Data Alliance. I think Data
Alliance has more variety and their site is more specific to antennas,
cables etc. so I would recommend them first; I had already gotten some
items off Amazon before I discovered them.
The way I set up my L1 and L2 rockets is I think similar to what you
want to do. I had the EggTimer TRS in the AV. I ran one of those short
pigtail cables from the EggTimer to the AV bay bulkhead, making a hole
just wide enough so the threaded connector could get through. Then on
the other side was a short RP-SMA extension cable, long enough (say, 15"
or so) so that my antenna ended up near the top of the upper fuselage
segment, away from the ejection charge. I taped the antenna to the
inside wall of the tube so it would not get tangled in the parachute
lines. I also stuffed a piece of Nomex down bay the bulkhead between
the ejection charge and RP-SMA extension cable to prevent damage to the
cable. This all worked well.
I was also worried about the end of the cable not being long enough to
poke through the 1/4" bulkhead and mate with extension cable and/or
antenna. So, I bought some RP-SMA couplers that were a little longer
but I ended up not using them. As it turns out the length of the
threaded end on the pigtail was just right -- went through the bulkhead
just enough that when I screwed on the extension cable or antenna it was
a nice tight fit.
The only thing I did not like about those little pigtail cables is that
the cable jacket is very stiff. In my 2" minimum diameter rocket I used
for L2, the EggTimer + batteries were already packet in pretty tight and
the stiff cable was annoying to work with. Just flex it several times
beforehand to loosen it up. Or, buy a short cable from Data Alliance.
They sell some as short as 2 inches and are more flexible.
Here are some links to useful pages on the Data Alliance site for cables
and antennas, both for the onboard EggTimer and the receiver on ground:
https://www.data-alliance.net/rp-sma-extension-cables/
https://www.data-alliance.net/rp-sma-adapters/
https://www.data-alliance.net/850-950mhz-antennas-rp-sma/
And on Amazon:
http://a.co/d/dYEAq3I
http://a.co/d/bhIgKCC
http://a.co/d/4T2BKaX
http://a.co/d/eFMJhvt
http://a.co/d/aNv8Ouu
Note that there are a wide variety of antennas out there; for best
performance with an EggTimer you'll want one tuned for ~900 MHz. I've
also tested with spare antennas off old wi-fi routers and while they
work they are optimized for 2.4 GHz or 5 GHz.
Terry
On 9/28/2018 9:36 AM, R Dierking wrote:
So, that’s reverse polarity SMA. The Featherweight must be regular polarity.
Now, I wonder about a longer bulkhead connection.
Thank you,
Richard
On Sep 28, 2018, at 9:28 AM, Rob Hoegee <hoegee.rob@xxxxxxxxx> wrote:D����fj)b� b���q�Z���zX���+�m�����y�b��(�����hat=
I just purchased one of these for my eggfinder
https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ebay.com%2Fitm%2F401569726412&data=02%7C01%7C%7C51e5a5d88b854bbd17b508d6255f7a29%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636737489326348510&sdata=KNhoy6liQRBGaoM0EWTx9N6e5G50XbQw9fCtDY6rhBc%3D&reserved=0
On Sep 28, 2018, at 8:36 AM, R Dierking <applerocketry@xxxxxxxxxxx> wrote:
I need to run a short cable from the GPS transmitter to the bulkhead of the alt
bay and need to know what config to purchase through Digi-Key or maybe Amazon.
The antenna is a short one, only 5 cm long. The antenna has a male pin at the
center and the receiver on the GPS unit is female. Is that SMA or RP-SMA?
Also, since I need to go through a 1/4â thick bulkhead, I was wondering if
there are extra long connectors to go though the thick bulkhead?
Please advise and thank you for your help.
Richard Dierking
TRA 11366, L3Dà
«fj)b bČÚèqÈZ”úȚzXŹ¶Ê+m§ÿđĂëyébČÛ(źćËź
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