Transmitter Solutions EMP300MCD21V 300 MHz Fixed-Code Compatibility Details
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.
What This Transmitter Does
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.
All Verified Compatibility
- Multicode 3089.
- DIP-switch receivers operating at 300 MHz and using the compatible fixed-code format.
- Multicode DIP-switch digital receivers operating at 300 MHz.
10-Position DIP-Switch Coding
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.
Standard Emperor Version Without ChargeGuard
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.
Similar Parts Are Not Automatically Interchangeable
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.
Features and Specifications
| 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 |
Manufacturer Temperature Specification Difference
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.
Also Known As and Related Product References
- TRAEMP300MCD21V - Gate Openers Unlimited catalog SKU.
- EMP300MCD21V - Transmitter Solutions manufacturer model.
- Emperor 300MCD21V.
- EMP300MCD21V-C - related ChargeGuard version.
- Multicode 3089 - manufacturer-identified compatible transmitter reference.
- 300MCD21V2 - related Stinger2 300 MHz one-button visor transmitter; verify the required model and housing.
Package and Battery Check
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.
Technician Note
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.
Before Ordering Checklist
- Confirm the receiver operates at 300 MHz.
- Verify the existing system uses a fixed-code DIP-switch receiver.
- Count 10 physical code-switch positions.
- Confirm Multicode 3089 compatibility when replacing that transmitter model.
- Verify the exact EMP300MCD21V model designation.
- Check whether ChargeGuard is required before choosing between EMP300MCD21V and EMP300MCD21V-C.
- Confirm one-button operation matches the existing application.
- Use the authorized receiver code or an authorized functioning transmitter as the coding reference.
- Confirm package contents when battery or visor clip inclusion is important.
Programming and Service Notes
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.
Professional Advisory
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.
Product Questions and Answers
Is TRAEMP300MCD21V the same transmitter model as EMP300MCD21V?
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.
Is the EMP300MCD21V compatible with the Multicode 3089?
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.
Can the EMP300MCD21V work with any 300 MHz DIP-switch receiver?
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.
How many DIP switches does the EMP300MCD21V use?
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.
Does the EMP300MCD21V have ChargeGuard?
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.
Is the Stinger2 300MCD21V2 the same product as the EMP300MCD21V?
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.
What battery does the EMP300MCD21V use?
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.
What should I check if the EMP300MCD21V LED lights but the receiver does not respond?
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.
