[Ian Wall]

I have not tried to replace a Spektrum receiver antenna. However, I have had to replace a receiver antenna for a Futaba FASST receiver. This was because someone had decided to trim the end by only some 10 mm and the effective range of the receiver came down to only about 20 feet. They did this as they thought that it would be the same as slightly trimming the antenna on a more common 27 MHz or 40 MHz system, not realising that the effective antenna of a 2.4GHz system is only the last 31mm and what actually comes out of the receiver is the antenna feeder. This antenna feeder is actually a micro sized coaxial feeder and not a multi-strand wire antenna as the lower frequency systems have. It is only the last 31 mm of this lead that is actually the antenna.
To replace the receiver on the FASST system, one needs to purchase a replacement antenna and unplug the old one from the receiver circuit board and plug the new one in. This is very much like the coaxial feeder cable that you connect your television to the antenna, except of course it is very much smaller.

Having looked at the official Spektrum site, their system appears to be fairly similar.
By going to “Spektrum SR3100 Antenna Bulletin”, it takes you to the following link:

http://www.spektrumrc.com/Articles/Article.aspx?ArticleID=1780

The following information is stated on this link:

………“Spektrum’s SR3100 receiver (included with the DX3R) features a coaxial antenna. Do not cut the antenna. The exposed area at the tip of the coax is the functional part of the antenna and must remain at 31mm in length. Altering the 31mm length will detune the receiver reducing range.”

It also states, “…..New coaxial antennas are available SPM9005 and snap onto the receiver board…..”

Hope that this may be of use to you and also let others know that the 2.4GHz receiver antenna system must not be treated like either the more common 27 MHz or 40 MHz systems.
Ian