Whitford ATV Repeater Site

Whitford 23cm Repeater

An ATV beacon / Repeater is running in the building at right, furthering the coverage that would be normally be blocked due to hills and ridges from the main ATV repeater.

Input 1 is 615MHz Vision, 620.75MHz Sound, from the main Amateur TV repeater, ZL1BQ.
Input 2 is 1284 MHz FM video, approx 15 MHz bandwidth, with intercarrier sound at 5.5MHz / 5.74MHz.

The output is 1248 MHz FM video at 10 Watts into a 10 element panel array, directed across the bulk of the city. Coverage is across 90 deg approx, so a system of 2 panel arrays for receive and another 2 for transmit are being considered.

ATV Controller

The repeater is controlled by a 68HC11 based microcontroller programmed by ZL1QF. Connections are by standard DB25 connector, as shown below. This connection layout was primarily used at the Nihotipu ATV repeater site, and the Whitford site has inherited the architecture.
Note that some inputs and outputs are not implemented, as the hardware is yet unavailable.

**Pattern Control**
Pin	Usage	Action Low	Action High
1	Ground	-	-
2	Port E 1 - Analogue Input 1
3	Port E 2 - Analogue Input 2
4	Reserved for future expansion
5	Reserved for future expansion
6	Reserved for future expansion
7	Ground	-	-
8	Unused
9	Port C 6 - Talking Clock Trigger
10	Port C 7 - Talking Clock Output
11	Unused
12	Unused
13	Unused
14	Teletext Page Address Bit 0	Pages 0, 2, 4 etc	Pages 1, 3, 5 etc
15	Teletext Page Address Bit 1	Pages 0-1, 4-5, 8-9 etc	Pages 2-3, 6-7, 10-11 etc
15	Teletext Page Address Bit 2	Pages 0-3, 8-11, 16-19 etc	Pages 4-7, 12-15, 20-23 etc
16	Teletext Page Address Bit 3	Pages 0-7, 16-23, 32-39 etc	Pages 8-15, 24-31, 40-47 etc
17	Teletext Page Address Bit 4	Pages 0-15, 32-47	Pages 16-31, 48-63
18	+ 5 Volts
19	Teletext Page Address Bit 5	Pages 0-31	Pages 32-63
20	Reserved for future expansion
21	Reserved for future expansion
22	Reserved for future expansion
23	Reserved for future expansion
24	Reserved for future expansion
25	Reserved for future expansion

**AV Control**
Pin	Usage	Action Low	Action High
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
15
16
17
18
19
20
21
22
23
24
25

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