Freq manager

The Freq Manager (Freqman) is a frequency database manager. It lets you browse, create, edit, and delete frequency entries organized into named lists (categories). These lists are shared with other apps such as Recon, Scanner, and the Audio-Receivers receiver, which can load them directly.

SD Card location

Freqman files are stored in the FREQMAN/ folder on the SD card as plain .TXT files. Each file is one category.

Using the app

The top bar shows the current category (file). Use the encoder to cycle through categories.

Button	Action
📄 (new file icon)	Create a new category
🗑 (red trash icon)	Delete the current category
Edit	Open the full edit screen for the selected entry
Frequency	Quick-edit just the frequency of the selected entry
Description	Quick-edit just the description of the selected entry
➕ (add icon)	Add a new entry to the current category
🗑 (red delete icon)	Delete the selected entry
Exit	Exit the app

The edit screen lets you set: Entry Type, Frequency A, Frequency B, Modulation, Bandwidth, Step, Tone (CTCSS), and Description.

Freqman file format

Files are plain text, one entry per line. Fields are comma-separated key=value pairs.

• Empty lines are ignored
• Lines starting with # are comments and are ignored
• Maximum description length: 30 characters
• Maximum entries per file: 150 (file is truncated if exceeded)

Warning

Any content that does not match a recognized field is silently ignored.

Entry type fields

Every entry must begin with one of these type-defining key pairs:

Keys	Type	Description
f=freq	Single	One frequency
a=start,b=end	Range	Frequency range to scan
r=rx_freq,t=tx_freq	HamRadio	Ham relay: RX and TX frequencies. TX is scanned as a single frequency in scanner mode.
l=listen_freq,t=tx_freq	Repeater	Repeater: listen frequency (also used as single freq when repeater mode is inactive) and TX offset

Optional fields

Key	Description
m=modulation	Modulation mode
bw=bandwidth	Bandwidth (must appear after m= in the line)
s=step	Frequency step — only meaningful for Range entries
c=tone	CTCSS tone frequency — only meaningful for HamRadio entries
d=description	Free-text description (max 30 characters)

Possible values for modulation

Value	Notes
AM
NFM
WFM
SPEC	Spectrum / raw IQ
AMFM	Special: AM+FM demod for HF WeatherFax (used by WeatherFax app)
FMAM	Special: FM+AM demod for NOAA 137 MHz APT (used by NOAA app)

Possible values for bandwidth

AM: DSB 9k, DSB 6k, USB+3k, LSB-3k, CW

NFM: 8k5, 11k, 12k5, 16k

WFM: 80k, 180k, 200k

SPEC: 12k5, 16k, 25k, 32k, 50k, 75k, 100k, 150k, 250k, 500k, 600k, 750k, 1000k, 1250k, 1500k, 1750k, 2000k, 2250k, 2500k, 3000k, 3500k, 4000k, 4500k, 5000k, 5500k

Possible values for step

10Hz, 50Hz, 0.1kHz, 1kHz, 5kHz, 6.25kHz, 8.33kHz, 9kHz, 10kHz, 12.5kHz, 15kHz, 25kHz, 30kHz, 50kHz, 100kHz, 250kHz, 500kHz, 1MHz

Example file

# My frequency list
f=468000000,d=Single Freq
f=468000000,m=AM,d=Single Freq AM
f=468000000,m=NFM,bw=12k5,d=Single Freq NFM
f=468000000,m=WFM,bw=200k,d=Single Freq WFM
f=468000000,m=AM,bw=USB+3k,d=Single Freq AM USB
a=87000000,b=110000000,m=WFM,bw=200k,s=50kHz,d=WFM radio search
r=430150000,t=430550000,d=HAM relay
r=430150000,t=430550000,m=NFM,bw=12k5,c=88.5,d=HAM with CTCSS
l=430150000,t=431150000,m=SPEC,bw=1000k,d=1MHz repeat txoffset

Additional freqman files

Community-maintained and country-specific freqman files are available at: https://github.com/portapack-mayhem/mayhem-freqman-files