English Arabic

Micro UHF

Micro UHF




The Micro is the smallest transmitter, and at only 3.5g is the perfect transmitter for use in Falcon races and competitions.

You will be surprised to find that it has more range than most larger, heavier transmitters.

It is designed around a flat round battery so that the entire transmitter is also flat and round which makes an ideal shape for mounting on the tail.

There is also a special Marshall Micro tail-mount designed specifically for the Micro to keep it more secure and free from extra movement as the bird flies.

Available frequencies: UHF 432-436MHz

Key Features

The Micro is our smallest transmitter design, weighing only 3.5 grams with the tiny 1225 3v lithium coin-cell battery installed. Yet its range exceeds that of most transmitters twice or three times its size and weight.

In this image, Terry installs the especially small tail piece has been made just for the Micro transmitter.

The matching tail-piece installation tool is used to quickly install the tail piece from above on to the deck feather.


Using the very small and light lithium coin cells, the Micro transmitter is engineered to radiate the most power possible while squeezing the battery's reserves most efficiently. At room temperature, the Micro will transmit continuously for 30 hours of normal use (30 one hour flights, one month) before telling you to change the battery with a double beep every tenth pulse. After that, the battery runs about 68 more hours for a total time of 96 hours. Using the Mag switch to Tap on and off for each flight, this might translate into one or two months of normal use per battery change, while always maintaining a safety margin of three days to look for a lost bird.

You can leave your battery in the Micro for up to six months. The transmitter keeps track of cumulative transmission time to estimate remaining battery life, even when not transmitting.


A Micro with a new battery will operate in extreme cold, down to -40C (-40F) due to it's unique design using tiny capacitors to store up the charge even when a battery's current begins to drop due to extreme cold.

But as coin cell batteries run through their life cycle, they lose some of their ability to provide current to run the transmitter in very low temps, so that after 48 hours of normal use the same battery may not work below -18C (0F). This only means that if you are about to fly in very cold temps, and there's a chance your bird may be lost overnight when the temperature drops, you should always use a new battery.

Intended Use

As a tail mount, the Micro hugs the tail due to it's flat shape, giving a low and safe profile on the feather. Shown more clearly in the Image Gallery, this unique shape adds to its safety when used with this mounting method. There are still no other flat transmitters on the market. With far less weight and inertia, the Micro is also ideal for neck mounting.

The Micro has a magnetic on/off switch so it can be left on the tail 24/7 during the season, removing it only once a month or so to change the battery. Customers comment on how nice it is not to have to unscrew the lid and remove the battery after each flight to turn it off.

The Micro's short, safe 7-inch antenna length makes tail mounting much more appealing.

Using the Micro during Falcon Races is almost like having nothing on, to give the least hinderance possible. But if your bird takes off after a stray pigeon instead of going to the lure, you still have the protection of a long range transmitter.

The  Micro might be used as a primary transmitter on any sized bird as the "Ideal Tail-Mount," or on the tarsus or neck mount. Originally intended for use with the very smallest of raptors, it's now ideal for larger birds as well since it now has the magnetic on/off switch, short 7-inch antenna and much more power than before.


Customers Say

"I love that you now have this small version of a transmitter. There have been times I know people have released a stray pigeon during the Races, and I do not dare fly without a transmitter."

"I have been using the Micro UHF now for two years after discovering it was even available and am amazed at the range for something so small. Thanks Marshall!"

"This is the best idea. I had to write and thank you for making a very small version of the Marshall transmitter for use in Racing. All ten of my Micros have worked perfectly this year!"


    What is the diference between the 1225 and the 1220 lithium batteries?

    Physical size (height) and Capacity, both are 12mm in diameter, but the 1220 is 2.0mm tall, the 1225 2.5mm.  This difference in size and capacity also gives the larger CR1225 the ability to supply more current during the pulse (and maintain a higher voltage during the pulse), thus providing better battery performance and longer run time in the Micro transmitter.  One other important fact to note, the 1225 comes in both ‘BR’ and ‘CR’ chemistries.  The ‘BR’ (Lithium/ Poly-Carbon Monoflouride) chemistry offers the best performance for long running low drain applications (like a wrist watch), but does not do well in higher drain applications (like a falcon transmitter).  In high drain applications, the high drain ‘CR’ (Lithium/Manganese Dioxide) works much better.

    Can I get a heavier antenna than the one it comes with standard?

    Yes, both the standard (thin) and heavy (thick) antennas are available for the Micro, made with the tiny aluminum ferrule attachment.

    Why can't I change the Micro from a leg to a tail mount, in the field?
    If you look closely at the first two pictures in the Image Gallery, you'll see there are two body designs: 1) the leg mount case with a tiny Bewit attachment loop at the top and a smooth back. This makes the Leg Mount version is also ideal for neck mounting, and 2) the tail mount case that has three tiny posts on the back to hold the tail spring and also make it field replaceable.

    To keep weight to the absolute minimum, we make them one way or the other.

    Can I use the Micro on larger birds, such as a female peregrine or goshawk?
    Yes, when used as a tail mount. Although designed for use on the very smallest of birds, all of us want to have as little weight as possible at all times, as long as there's not a significant sacrifice in power. It's our opinion that the Micro will, over time, become the preferred tail-mount option for this reason.

    How well does the Micro work in very cold conditions?

    With a new battery, the Micro will operate down to extreme cold temperatures (-40F).  However, the battery in the Micro is very small, and its ability to supply energy to the transmitter is limited at these temperatures (thus reducing run time).  We recommend using a new battery every day when flying in extreme cold temperatures.

    If I use the Micro as a Tail Mount, and a PowerMax on the TrackPack, does the antenna from the PowerMax cause any inerferences with the Micro or its signal?

    The circuitry used in all Marshall transmitters has been designed to be very robust and non-susceptible to interference.  Any Marshall transmitter can be flown next to other transmitters on the same bird (i.e. a Micro on the Tail and a PowerMax on the back), with no interference from one another.

    How much can I trim the antenna on the Micro without losing a lot of range?

    The antennas on all Marshall transmitters have been carefully tuned to the optimum length. If an antenna is cut down (significantly) from the length it was sent with as standard, drastic loss of range can occur.  Significant shortening of an antenna may also cause other un-intended side effects, so it is not recommended.

    It seems like my Micro goes in to double beep mode too early.

    If your Micro was produced prior to 2007, it contains both real-time voltage monitoring as well as a timer to tell you when to change the batteries. In certain conditions (like flying in cold temperatures), the double beep can activate prematurely (as it is telling you that the voltage in your battery has dropped), but will recover when the transmitter is warmed up.  2007 and newer Micro’s use only the battery timer to alert you to when it is time to change the battery.  2005-2006 Micro’s can be sent in to the factory for a simple re-programming to deactivate the voltage monitoring feature.

    If you have a newer (or updated) Micro, and are getting an early double beep warning, it is possible that the memory inside the transmitter was not reset when the battery was last changed.   To reset the memory, simply either

    a) turn the transmitter on with the magnet before changing the battery or

    b) short the contacts every time a battery is changed.

    This will assure a full reset of the battery timer, and will give you the correct run-time before the double beep occurs.

    Image Gallery

    Micro tail ...
    Micro tail mount on tiercel Barbary Micro tail mount on tiercel Barbary
    Micro leg m...
    Micro leg mount on a male Sharpie Micro leg mount on a male Sharpie
    Micro tail ...
    Micro tail piece made to match exactly right Micro tail piece made to match exactly right
    Open with b...
    Open with battery Open with battery
    Micro on Tr...
    Micro on TrackPack side view Micro on TrackPack side view
    Micro on fe...
    Micro on female peregrine Micro on female peregrine
    Bottom View
    Bottom View Bottom View
    Tail-mount ...
    Tail-mount on a female Merlin Tail-mount on a female Merlin
    Micro on a ...
    Micro on a backpack on a Merlin Micro on a backpack on a Merlin
    Micro on Tr...
    Micro on TrackPack side view Micro on TrackPack side view
    Top View
    Top View Top View
    Micro tail ...
    Micro tail mount on larger gamehawks Micro tail mount on larger gamehawks
    Tail-mount ...
    Tail-mount on a female Merlin Tail-mount on a female Merlin

    Configure Your Product
    Mounting Method Frequency Band if you need a specific channel, please specify during checkout
    Price with discount $275.00
    Sales price $275.00
    Sales price without tax $275.00