The Transmitter Solutions TRAEMP300MCD21V is the Gate Openers Unlimited catalog SKU for the Emperor transmitter identified by Transmitter Solutions as model EMP300MCD21V. This is a traditional one-button visor-style wireless transmitter operating at 300 MHz with a 10-position DIP-switch fixed-code system.
Transmitter Solutions specifically identifies the EMP300MCD21V as compatible with the Multicode 3089. The manufacturer cut sheet and programming manual also document compatibility with DIP-switch receivers operating at 300 MHz, including Multicode DIP-switch digital receivers.
The EMP300MCD21V sends one 300 MHz radio command to a compatible fixed-code DIP-switch receiver. The transmitter code is set with a 10-position toggle switch bank and must match the authorized code used by the compatible receiver system.
This is a fixed-code transmitter. It does not use a learn-button programming process or a rolling-code enrollment process. Matching frequency alone is not enough when replacing an existing remote.
The EMP300MCD21V uses a ten-digit toggle code switch. Manufacturer documentation instructs the user to set the transmitter switches to match the code used by another functioning authorized transmitter or the compatible system receiver.
The 10-switch format provides 1,024 code combinations. Before ordering, inspect the existing transmitter or receiver and count the physical code-switch positions. A 300 MHz transmitter using a different coding format is not automatically compatible.
EMP300MCD21V is the standard Emperor 300 MHz model. Transmitter Solutions separately identifies EMP300MCD21V-C as the related version with ChargeGuard.
Do not assume the standard EMP300MCD21V provides the green, yellow, and red battery-status indication documented for the ChargeGuard version. Verify the exact "-C" suffix when ChargeGuard is required.
The EMP300MCD21V-C is closely related but includes the ChargeGuard battery-status feature. Check the suffix before ordering.
The Transmitter Solutions Stinger2 300MCD21V2 is also a one-button, 300 MHz, 10-DIP-switch visor transmitter documented for Multicode 3089 compatibility. It is a different manufacturer model and housing family and should not be assumed to be the same packaged product as EMP300MCD21V.
The Firefly3 300MCD21K3 is a 300 MHz, 10-DIP-switch, one-button transmitter, but Transmitter Solutions identifies it as a key chain model and lists Multicode 3060 and 3070 compatibility. Do not substitute it based only on frequency and DIP-switch count.
Transmitters operating at 295 MHz, 310 MHz, 315 MHz, 318 MHz, 360 MHz, 390 MHz, 418 MHz, or 433 MHz are not replacements for this 300 MHz transmitter based only on appearance.
| Feature | Specification |
|---|---|
| Brand | Transmitter Solutions |
| Product Family | Emperor |
| Catalog SKU | TRAEMP300MCD21V |
| Manufacturer Model | EMP300MCD21V |
| Product Type | Wireless visor transmitter |
| Operating Frequency | 300 MHz |
| Number of Buttons | 1 |
| Button Color | White |
| Case Color | Gray |
| Mounting Style | Visor-style transmitter with clip slot |
| Code System | Fixed-code DIP switch |
| Code Switch Format | 10-position DIP/toggle switch |
| Code Combinations | 1,024 |
| Battery | 1 x 9V battery |
| ChargeGuard | No - EMP300MCD21V-C is the related ChargeGuard version |
| Operating Temperature | Current cut sheet lists -20 F to 85 F; manufacturer manual lists -20 F to 100 F |
| Overall Dimensions | 2-3/8 x 3-1/2 x 3/4 inch |
| Weight | 3 oz |
| FCC ID | SU7EMP300MCD21V |
| Verified Named Compatibility | Multicode 3089 |
| Warranty | 2 years per manufacturer documentation |
The Transmitter Solutions cut sheet lists an operating temperature range of -20 F to 85 F. The manufacturer programming manual lists -20 F to 100 F. Because the official documents provide different upper temperature limits, use the more conservative -20 F to 85 F cut-sheet specification when the installation depends on a defined temperature rating and verify the current product revision when necessary.
The manufacturer specifies one 9V battery for the EMP300MCD21V. Public manufacturer documentation reviewed for this model does not clearly define every retail package component or confirm visor clip inclusion. Confirm current package contents when a supplied battery or visor clip is specifically required.
The main ordering mistake with the EMP300MCD21V is matching only the 300 MHz frequency. Open the old remote or inspect the receiver and count the switches. This Emperor model uses a 10-position fixed-code switch bank. Also check the suffix carefully because EMP300MCD21V-C is the ChargeGuard version, while EMP300MCD21V is the standard version.
The manufacturer manual instructs the user to open the bottom front cover and set the ten-digit toggle code switch to match the code used by another functioning authorized transmitter. The same switches may also be matched to the compatible system receiver's documented code setting.
After setting the code, reinstall the battery and front cover and test the transmitter while the controlled gate or door is visible and the travel area is clear. If the LED does not light, check the battery isolator and 9V battery condition. If the LED lights but the receiver does not respond, verify the 10-switch code and receiver compatibility. Reduced range may indicate a weak battery, receiver antenna problem, or radio interference.
Do not bypass photo eyes, monitored safety edges, entrapment protection, door reversal systems, or operator safety circuits to correct a transmitter or receiver problem. If the receiver, gate operator, or garage door opener has damaged wiring or an unclear electrical or safety-circuit fault, have the system inspected by a qualified gate, garage door, or access control technician.
TRAEMP300MCD21V is the supplied catalog SKU, while Transmitter Solutions identifies the Emperor transmitter itself as model EMP300MCD21V. Verify the 300 MHz frequency and 10-position DIP-switch format when replacing an older remote.
Yes. Transmitter Solutions specifically identifies the EMP300MCD21V as compatible with the Multicode 3089. The transmitter uses a 300 MHz fixed-code system with a 10-position DIP-switch bank.
Transmitter Solutions documents the EMP300MCD21V for DIP-switch receivers operating at 300 MHz, including Multicode DIP-switch digital receivers. Verify the receiver frequency and fixed-code format before ordering because frequency alone does not establish compatibility with every radio system.
The EMP300MCD21V uses a 10-position DIP or toggle code switch and provides 1,024 code combinations. Count the physical switches on the existing authorized transmitter or receiver before ordering.
No. Transmitter Solutions identifies EMP300MCD21V-C as the related version with ChargeGuard. The standard EMP300MCD21V should not be ordered when the ChargeGuard battery-status feature is specifically required.
No. Transmitter Solutions lists both as separate 300 MHz transmitter models. Both are documented as one-button, 10-DIP-switch visor transmitters compatible with Multicode 3089, but they are different product families and should not be treated as the same packaged model.
The EMP300MCD21V uses one 9V battery. Public manufacturer documentation reviewed for this model does not clearly confirm every retail package component, so battery and visor clip inclusion should be confirmed when those items are required.
Verify the 10-position DIP-switch code and confirm that the receiver is a compatible 300 MHz fixed-code DIP-switch system. If the code and compatibility are correct, the receiver, antenna, radio interference, or operator input may require diagnosis by a qualified technician.