Co‑site
interference,
solved offline.
A complete intermodulation and site‑study workbench for land mobile radio — intermod products, receiver spurious, co‑site TX generation, harmonics, and level estimates. Every calculation runs in your browser.
Everything a co‑site study needs
Intermodulation products
Third, fifth, and seventh‑order difference products (2A−B, A+B−C, 3A−2B, 4A−3B) against your candidate receiver, ranked by proximity with hit / near / clear flags.
Spurious responses
Image, half‑IF, and IF‑breakthrough spurs from your receiver's IF and LO injection side — catches off‑channel transmitters that still reach the receiver.
Co‑site TX intermod
Products the tower itself emits when transmitters mix in a PA or junction — with a protected‑range filter to flag in‑band hits.
Level estimation
OIP3‑referenced product levels at device output and at the receiver, with an uncertainty band and TX‑PA / junction presets.
Harmonics & sums
Second and third harmonics plus additive sum products — the cross‑band and above‑band cases difference‑only analysis misses.
Band presets, any band
One‑click channel‑spacing and guard for VHF Low/High, UHF, 700, and 800 MHz — the intermod math works on whatever frequencies you enter.
Portable studies
Per‑transmitter power, antenna, and notes. Save and reopen studies as files, encode a whole study into a shareable link, and print a coordination report — all offline.
Your channel plans never leave your machine.
No account, no server, no uplink. Every product, spur, and level is computed in your browser — so sensitive public‑safety frequency data stays entirely under your control. Load it once and it keeps working with the network unplugged.
Open the workbench.
No sign‑up. It loads straight into a live site study you can start editing immediately.
Built by K9MLS · a field engineer's tool for field engineers