Thursday, 6 July 2017

The Perfect Radio

Here's a list of features I'd been thinking of for the perfect radio - mostly for VHF/UHF use and it would also be used in scanner mode quite a lot so many are scanning related. It's just a list I made for myself on my phone so not too much detail.

Radio Features:

Save to SD card/PC in format which can be exported as a video showing s-meter, freq etc. Only record when squelch open.

App to play back recordings with audio.

Smart skip - channels which are too busy get locked out until a break in activity - e.g. if >30% of scan passes are active it gets locked out until drops to <20 br="">
Per-channel delay times - e.g. wait 60 seconds even if squelch closed on a calling frequency in case they call again.

S-meter squelch on per-channel basis

Reset of all lockouts

Lockouts can have an expiry time

Linked search bands (like UBC3500)

Lock out ranges of frequencies or modes (applies to memories in that range too).

Record stats on channel use - auto lock out channels which are never used.

Open squelch on ANY CTCSS tone.

Lock out all non-tone channels

Signal in dBm on display

Select a lockout mask from a list

Change settings by geographic location - new set of memories or lockout mask when leaving town.

Select radio profiles from a list.

DMR auto identifies cc, slot and tg.

Direct entry of talkgroup via keypad on DMR.

Import DMR contact list of any size from csv file.

Export of all radio activity to CSV file (time and location of any signal above a threshold or transmission).

Audio AGC receiving on FM and digital modes - can be applied to recordings.

Each channel member of a rule group, with tones, lockout, power, geo zones etc.

Zones - distance from a point, grid squares etc. Can be either allow or lockout.

Priority tx frequency - when radio is set to auto/scan mode, any ptt activity transmits on a fixed calling frequency (could be APRS/emergency). If PTT pressed for >2 seconds, receive goes to that frequency and scanning stops. If not, it carries on scanning or rx on other freq.

Built in usb audio and serial port.

CAT control even on handhelds (micro USB) and FM mobiles.

Access over telnet/SSH, or serial console with command line.

Web browser access on ethernet/wifi models.

Bluetooth earphone/mic support.

Music playback off sd card/aux in, through bluetooth or speaker. Mix music with receive audio, ducking with squelch. So rx audio can go through car speakers.

Soft sub band muting, when sub band rx broadcast FM etc.

Channels can be scan groups or search bands.

Tone/dmr only smart search saves any real channels and not interference. Can choose to save only correct tone/group or ANY tone/group on that freq.

Tone/dmr only scan can still pause silently on other found channels for 5 sec if busy and show MPT1327 trunking ID etc. Channels can be set to stop while busy but have speaker audio muted, either recording or not recording.

Lockout rule for channels by time and date.

Programmable sequences of vfo/scanning e.g.

Vfo 145.500

If no activity for 10 min or if squelch open 30 sec in 60 sec step on

Vfo 433.500

If no activity for 10 min step on else goto start

Scan all groups

Goto start.

Email alert on events (per channel etc.)

Override of tone squelch above signal threshold

Voice keyer uses mp3/wav files

Schedule playing file/morse ID/beep/dead carrier, with delay on busy channel.

Built in decoding of jt65/psk/cw/packet/wspr with upload of spots or saving to text file. Aprs gateway support (passcode etc.).

App for android with ptt button support to simulate radio over internet connection.

Parrot mode - records up to a time limit and transmits received audio. Can use audio agc. Minimum tx time can be set or a preset audio file can be played instead of received audio if squelch was open for less than minimum time (broken signal or testing access).

Programmble i/o (3-16v in, 5v , source, sink or dry relay contacts out?) For events, ptt, squelch out etc. External squelch contacts can be different to audio squelch.

Digital vox on any signal above digital silence.

Momentary ptt latch/unlatching signal

Tx deviation independent of rx bandwidth

If signal above threshold, squelch changes to s-meter.

Direct link between 2 radios over network - controls on one radio take over from the one with the antenna, with full tx/rx audio.

Analogue i/o programmable, 0-10v in, 0-5v out for external s-meter, power control. Events can set or be triggered by voltage levels.

SWR available on analogue output or to set digital i/o.

Parameters of other radios can be read/written over network/internet. E.g your frequency can be sent to server/friend if within certain bands so they can see if anybody is on a certain band. Events can be sent, ptt pressed, squelch open etc.

Rewind last 20 seconds of audio - when squelch was open.

Events can be triggered by a certain frequency being active or above a threshold - "i can hear 440.800 so change to midlands profile" or "if paging >-30dbm, lock out range 108 - 200 MHz", checking on a 'silent' scanning memory.

Replace audio with a few seconds 'ringtone' or silence on selected channels when squelch opens, or if squelch opens and no tone/encrypted/no audio.

Squelch open/close 'roger' beep can vary depending on signal level.

Receive diversity on 2nd antenna.

Dual receive relay scan - sub rx scans and tunes main rx to active freq. Stays on that freq until something else found.

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