User`s manual

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Important Regulatory Information
This device complies with Part 15 of the FCC Rules. Operation is
subject to the following two conditions: (1) this device may not
cause harmful interference, and (2) this device must accept
any interference received, including interference that may
cause undesired operation.
It is intended to be used ONLY for educational and
experimental use in Model Rockets and Class II/III amateur
High Power Rockets which are classified as aircraft by the
Federal Aircraft Administration (CFR 14 §101.25), and which
must by FAA and NFPA regulations be operated at least 1,500’
away from any populated buildings. Although unlikely, this
device may cause interference with consumer devices that run
on the unlicensed 902-928 MHz band, and therefore must not
be used in residential areas.
The Eggtimer TRS uses RF modules in the 902-928 MHz ISM band manufactured by Hope RF,
model HM-TRP-915. They are intended to be used in the United States or other countries with
similar spectral regulatory rules. These modules have been tested by Hope RF to be compliant
with the FCC Part 15 regulations for non-licensed intentional emitters, and as such have been
permitted to be imported into the US. However, Hope RF (at the time of this document) has not
obtained formal certification with the FCC. As a hobby kit, designed for educational and
experimental purposes, the Eggtimer TRS is considered by the FCC to be “generally exempt”
from authorization requirements. Nonethless, we have made a good faith attempt to comply
with all technical regulations, and you should too by building it exactly as per the instructions,
and by using only the antenna on the transmitter module that we recommend in the instructions,
or a suitable replacement as outlined in the Appendix.
Because the Eggtimer TRS runs on an unlicensed band, there is no protection against
interference from other sources; basically, you get what you get. We’ve done substantial testing
and are confident that your Eggtimer TRS is unlikely to be significantly affected by outside radio
sources, but there’s no guarantee.
If your Eggtimer TRS causes interference in a residential setting, or with licensed radio systems
(such as TV or ham radio), you must stop using it until you correct the problem. This is
extremely unlikely given the small amount of power and the “tightness” of the transmitter’s
output, and in particular the distance from any population that HPR rockets must be flown.
Nevertheless, you need to be aware of this, and be willing to abide by the rules. These are the
same rules that govern other non-licensed transmitters, such as cordless phones, WiFi and
Bluetooth® devices, and garage door openers.