Duplexer & Filter Tuning
// Repeater filter system analysis
See the passband, notch, isolation, and loss.
A duplexer can look fine and still cost receiver sensitivity, leak transmitter energy, or miss the intended notch. Arcovex RF uses swept measurements to characterize and tune amateur VHF/UHF duplexers, cavity filters, and repeater filter systems.
Reports focus on measurable performance: insertion loss, rejection, isolation, and return loss where applicable. Final scope depends on frequency, connector type, cavity design, condition, and available fixtures.
What may be measured
The measurement plan is matched to the filter topology, intended frequency pair, and service requested.
Pass-frequency loss
Insertion loss at the intended transmit and receive pass frequencies.
Notch depth
Rejection at the unwanted frequency and across the nearby response.
Forward isolation
Isolation from the transmitter path into the receiver path when applicable.
Reverse isolation
Isolation in the opposite direction for the accepted test configuration.
Return loss
Port-match measurements where the device and fixture support them.
Before / after response
Swept plots documenting measurable change when tuning is performed.
What the response tells you
Useful duplexer performance is a balance: low loss where signals should pass and deep rejection where they should not.
Preserve wanted signal
Insertion loss shows how much transmit power or receive sensitivity is sacrificed through the filter path.
Reject unwanted energy
Notch depth and isolation show how effectively the system separates transmit and receive energy.
Control reflections
Return loss helps document how well a port is matched at the frequencies that matter.
Characterization first. Tuning when needed.
Starting prices reflect bench work on accepted amateur VHF/UHF equipment. Complex, damaged, commercial, or site-installed systems are quoted separately.
One filter
Single filter sweep report
A focused swept response for an individual cavity or RF filter.
- Pass or notch response
- Selected markers
- Summary findings
Characterization only
System baseline
Duplexer characterization
Document the current response before deciding whether adjustment is needed.
- Insertion loss
- Rejection / isolation
- Swept plots
No tuning included
Bench tuning
Amateur duplexer tuning
Measurement-led tuning for accepted amateur VHF/UHF duplexers and cavity systems.
- Initial characterization
- Supported adjustments
- Final response plots
Most requested service
Complex systems
Commercial or site work
Special configurations, repeater-site work, unusual fixtures, or commercial equipment.
- Scope review required
- Travel quoted separately
- Site conditions apply
Accepted case by case
Final pricing depends on frequency, connector type, cavity count, condition, access, required adapters, prior modifications, and requested documentation.
Useful data for repeater decisions
A clear sweep helps distinguish a tuning problem from feedline, antenna, shielding, desense, or site-related issues.
A good fit for
- Amateur repeater owners and clubs
- GMRS repeater owners where allowed
- Used duplexers with unknown history
- Cavity and pass/reject filters
- Bench-level repeater troubleshooting
What the report may include
- Insertion-loss and rejection markers
- Isolation measurements as applicable
- Before and after sweep plots
- Test setup and condition notes
- Plain-language summary findings