SCART | Repeater Help

SCART ATV Group South Coast Amateur Radio & Television

GB3FW & GB7FW · Fort Widley · Portsdown, Portsmouth PO6 3LS

Repeater access settings and future remote user functions for Fort Widley. Confirmed details are listed below; settings awaiting confirmation are clearly marked. Command examples will be added when the functions are ready.

GB3FW D-ATV Top ↑

Information · GB3FW receive / your transmit

Digital ATV (DATV) input	1249 MHz · configured receive preset
DATV symbol rate (SR)	333 kS/s · configured receive preset
DATV receive standard	DVB-S / DVB-S2 receiver · live lock type shown in Receiver Status
Receive polarisation	Horizontal · Alford slot
Receive FEC / modulation	Reported by the received signal; live details shown when reported by Longmynd
DATV video decoding	Received-programme codec verification remains part of RF acceptance testing
Analogue ATV input	USB capture device connected to the RX Pi; input not configured or commissioned
ATV talkback	144.750 MHz NBFM · X50
Receiver operation	BATC Portsdown RX Raspberry Pi · automatic receiver, stream and local display startup

The current digital receive preset is 1249 MHz / 333 kS/s. Receiver and stream services are running; full on-air picture/audio and loss/reacquisition acceptance tests remain to be completed. Listen on talkback and coordinate testing with the station team.

Information · GB3FW transmit / your receive

Setting	Information
DATV output frequency	3406 MHz
Transmit polarisation	Horizontal · slotted waveguide
Broadcast standard	DVB-S (TBC)
Symbol rate (SR)	2 MS/s (2000 kS/s) (TBC)
Constellation / modulation type	To be confirmed
FEC (Forward Error Correction)	7/8 (TBC)
Video encoding	H.262 (MPEG-2) (TBC)
Output power / ERP	To be confirmed
Audio encoding / audio settings	To be confirmed
Video resolution	720p (TBC)

The BATC receiver stream is operational. The DATV RF transmitter and its monitoring still await commissioning; candidate RF output settings below are not confirmed operating instructions.

Candidate digital output preset: symbol rate, standard, FEC, encoding and resolution remain to be confirmed for GB3FW.

Operation and reception

The fields below will be completed from GB3FW commissioning tests. Unconfirmed settings are not operating instructions.

Operating notes

Item	Information
Receive scan / preset sequence	Current fixed preset: 1249 MHz / 333 kS/s; automatic scanning is not configured
Expected lock and relay delay	To be confirmed
Beacon / test-card and identification schedule	To be confirmed
Operating hours / availability	Receiver/stream services start automatically with the RX Pi; availability depends on site power and connectivity
Coverage / reception guidance	To be confirmed
Settings last verified	5 November 2026 · configuration and service health; RF acceptance testing pending

Programme source selection

Item	Information
Available programme sources	Local digital receiver and standby picture; analogue USB capture and remote programme input await configuration
Source selection method / access link	To be confirmed
Authorisation required	To be confirmed
Default source / timeout behaviour	Standby when no usable digital programme is available; received programme when stable digital lock is confirmed

Browser and VLC viewing are explained below. The BATC programme stream does not confirm off-air RF reception. Source selection details will be published only after the available controls and access rules have been verified.

Receiver status and reception history

Receiver Status shows searching, acquiring lock or DVB-S/DVB-S2 lock; the tuned frequency and symbol rate; stream/standby activity; and local display service health. Checks run approximately once per minute.

MER, modulation, FEC, BER and transmitted service/provider IDs are captured from the RX Pi when a fresh locked programme provides them. Awaiting means no current value is available.

Recent DATV Connections keeps the newest observed reception first, with a compact input label and available signal fields. Callsigns, when supplied by the transmitted service/provider text, will be labelled reported IDs; they are not authenticated identities. Short receptions between checks can be missed. Analogue reception and identification require separate commissioning.

Recent DATV transmissions records observed BATC publisher on/off changes. The first entry is a first observation, not a reconstructed start time. RF transmitter on/off monitoring remains unconfigured and is not inferred from streaming.

BATC previews play directly between the viewer and BATC; each website viewer does not cause the Station Server to relay another copy of the video.

Streaming

Streaming Out

The GB3FW video stream is sent to the BATC Live Video Streamer.

Watch GB3FW on BATC (HTML5), or connect directly using VLC Media Player.

Web browser viewing (HTML5)

For viewing in a web browser, use the HTML5 player. The BATC link above selects HTML5 automatically. If a player choice is shown, choose HTML5. No VLC installation is required for browser viewing; use VLC with the direct stream address below.

Direct stream address

rtmp://rtmp.batc.org.uk/live/gb3fw

Desktop viewing

Open VLC and choose Media → Open Network Stream → Network.
Paste the address above into Please enter a network URL.
Select Play. Allow a few seconds to connect and buffer.

Mobile viewing

Open VLC on Android, iPhone or iPad and select Network.
Choose Open Network Stream or New Stream, depending on your device and VLC version.
Enter the address above, then select Open Network Stream or Play. Allow a few seconds to connect and buffer.

Save the stream as a favourite or playlist entry where supported.

Supported devices

VLC Media Player is available for Windows, macOS, Ubuntu and other Linux distributions, Apple iOS and tvOS, Android, and selected game consoles.

Troubleshooting

Check the stream address and your Internet connection.

Stop and reopen the stream. If necessary, completely close and restart VLC.

Note

The RX Pi publishes the GB3FW BATC stream at 1280 × 720 (720p), 16:9, 25 fps, H.264 video with AAC audio. It shows a standby picture while waiting for a usable digital programme and selects received DATV when the receiver has stable lock. A working BATC stream does not prove that the RF transmitter is on.

Streaming In

Remote programme input to GB3FW is planned and is not yet commissioned. The BATC stream currently carries the local DATV receiver or its standby picture.

Future control or programme-input access will require SCART registration and the appropriate permission. Do not send unsolicited streams to the station. Details will be published after commissioning.

User commands

Remote user functions are being defined. This table will explain each command, its purpose and any access requirements when available.

Function	Command	What it does	Availability
User functions	To be defined	Instructions and examples will be added after testing.	Not yet available

GB7FW D-STAR Top ↑

Information · GB7FW radio settings

Setting	Information
Mode	D-STAR DV · 70 cm · Module B
Repeater transmit / your receive	439.6750 MHz
Repeater receive / your transmit	430.6750 MHz
Duplex offset	Minus 9.000 MHz
Polarisation	Vertical
MY / your callsign	Your own licensed callsign
UR / TO · general call	`CQCQCQ`

Information · GB7FW callsign routing

Setting	Information
RPT1 / R1 · repeater	`GB7FW B`
RPT2 / R2 · gateway	`GB7FW G`
Module B	70 cm DV repeater module
Module G	Gateway routing
Gateway access	Set RPT2 to GB7FW G rather than NOT USED when gateway access is required

RPT1 and RPT2 are eight-character fields: put B or G in position 8, with two spaces after GB7FW. Listen before calling and use a short identifying test transmission.

User commands

Remote user functions are being defined. This table will explain each command, its purpose and any access requirements when available.

Function	Command	What it does	Availability
User functions	To be defined	Instructions and examples will be added after testing.	Not yet available

Contact us

Preliminary contact email	info AT scartgroup.co.uk
Website	SCART Group

Battery banks and power monitoring

Battery Bank 1 comprises six Exide/GNB Marathon M12V105FT AGM VRLA batteries in parallel: 12 V / 600 Ah nominal (100 Ah per battery at the manufacturer’s 10-hour rating). Actual capacity depends on age and condition. Its percentage remains a generic AGM resting-voltage estimate; the manufacturer’s load-dependent discharge tables are not a resting state-of-charge curve. Battery Bank 2 is flooded lead-acid EFB: two Halfords HLB681 12 V / 115 Ah batteries in parallel, rated 230 Ah nominal, replacing the former lithium battery. Historical lithium measurements remain historical records.

Battery Bank 2 has the first current/power monitor. Battery Bank 1 awaits its own monitor. Signed current and power are measured values; Battery Bank 2 polarity is verified: positive current/power indicates charging and negative indicates discharging. Bank 2 uses a generic flooded-battery resting-voltage reference, not an HLB681-specific charge/discharge curve. Charging and load can distort the estimate. Voltage-based battery graphics are approximate guides and do not measure remaining capacity.

Wind and solar electrical monitors are not installed. Weather-station sunlight is not generated electrical power. The private daily system status email is scheduled for 20:00 UK time.