3.4 GHz DATV - Revision history

G6jyb: /* Transmitting 3.4GHz DATV */

2018-09-23T18:02:47Z

Transmitting 3.4GHz DATV

2018-09-23T18:01:56Z

Editorial tweaks to intro

2017-11-19T18:33:36Z

Transmitting 3.4GHz DATV

2017-06-28T07:58:42Z

Ionica Big boards

2017-06-28T07:58:31Z

Ionica Big boards

2017-06-28T07:58:04Z

Airspan AS4000

2017-05-28T06:11:15Z

Ionica Big boards

2017-05-28T06:09:41Z

Transmitting 3.4GHz DATV

2017-05-28T06:07:05Z

Receiving 3.4 Ghz DATV

2017-05-28T06:05:54Z

Receiving 3.4 Ghz DATV

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 [[File:G8GTZ antennaes.jpg|400px]]
-===Transmitting 3.4GHz DATV===
+===Transmitting 3.4 GHz DATV===
-It is suggested that rather than try to generate DATV directly on 3.4GHz, it is easier and probably more efficient to generate the DATV signal using the Portsdown at a lower frequency and then converting up using a Narrow Band transverter.  This can either be a commercial unit or home built using modules described below.
+It is suggested that rather than try to generate DATV directly on 3.4 GHz, it is easier and probably more efficient to generate the DATV signal using the Portsdown at a lower frequency and then converting up using a Narrow Band transverter.  This can either be a commercial unit or home built using modules described below.
-A few years ago there was a lot of surplus 3.4GHz wireless broadband equipment available - you don't see some much now, but if available it can be easily converted to DATV operation.
+A few years ago there was a lot of surplus 3.4 GHz wireless broadband equipment available - you don't see some much now, but if available it can be easily converted to DATV operation.
 ====Airspan AS4000====

@@ Line 1: / Line 1: @@
-As the UK band has recently been reduced to 10 MHz (3400 to 3410MHz) it is only possible to run DATV and there is currently very little activity in the UK apart from repeater outputs.
+In 2014/5 the UK 9cm amateur band was reduced to 3400-3410 MHz (from 3475 MHz), along with restrictions in 13cm. Consequently it only has the room to run DATV. However these spectrum changes have prompted development work and the band has proofed useful for UK repeater outputs.
-Reports from the repeaters on 3.4GHz suggests it is very low noise spectrum and actually performs as well if not better than 2.3GHz.
+Reports from the repeaters on 3.4 GHz suggests it is very low noise spectrum and actually performs as well if not better than 2.3 GHz.
 There is (or was) a lot of surplus transmit (and receive) equipment on the surplus market, mainly from the failed Ionica broadband wireless system, and it is a very easy band to get on to, both for Tx and Rx.
-===Receiving 3.4 Ghz DATV===
+===Receiving 3.4 GHz DATV===
 It is very easy to receive 3.4 GHz DATV on using C band satellite LNBs feeding directly in to a free to air satellite receiver or [[MiniTioune|MiniTiouner]] - no big antennaes, pre-amps or filters needed.

← Older revision		Revision as of 18:33, 19 November 2017
Line 22:		Line 22:

	===Transmitting 3.4GHz DATV===		===Transmitting 3.4GHz DATV===
		+
		+	It is suggested that rather than try to generate DATV directly on 3.4GHz, it is easier and probably more efficient to generate the DATV signal using the Portsdown at a lower frequency and then converting up using a Narrow Band transverter. This can either be a commercial unit or home built using modules described below.

	A few years ago there was a lot of surplus 3.4GHz wireless broadband equipment available - you don't see some much now, but if available it can be easily converted to DATV operation.		A few years ago there was a lot of surplus 3.4GHz wireless broadband equipment available - you don't see some much now, but if available it can be easily converted to DATV operation.

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 [[File:bb1.jpg|400px]]
 Photo from G4BAO web page
 Whole chunks of working circuits can be retrieved from the Ionica main board to make a simple transverter as described on John G4BAO's site - don't forget, it is much easier now as we can use the ADF 4351 as the Local Oscillator on any frequency you desire.
 [http://www.bravoao.co.uk/g4bao/page8.htm Link to G4BAO site]

@@ Line 52: / Line 52: @@
 [[File:bb1.jpg|400px]]
+Photo from G4BAO web page
 Whole chunks of working circuits can be retrieved from the Ionica main board to make a simple transverter as described on John G4BAO's site - don't forget, it is much easier now as we can use the ADF 4351 as the Local Oscillator on any frequency you desire.
 [http://www.bravoao.co.uk/g4bao/page8.htm Link to G4BAO site]

@@ Line 28: / Line 28: @@
 [[File:g6gvi9cm.jpg|400px]]
 The Airspan AS4000 is an outdoor consumer unit operating in duplex mode (Tx and Rx) on 3.4 GHz - it needs DC supply, transmit IF and reference oscillator up the co-ax and sends rx IF down.
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 [http://www.qsl.net/g6gvi/9cm.html Link to G6GVI page]
 [http://www.m0dts.co.uk/?tag=3.4GHz&item=50 Link to M0DTS page]
 ==== Ionica PA ====

← Older revision		Revision as of 06:09, 28 May 2017
Line 22:		Line 22:

	===Transmitting 3.4GHz DATV===		===Transmitting 3.4GHz DATV===
		+
		+	A few years ago there was a lot of surplus 3.4GHz wireless broadband equipment available - you don't see some much now, but if available it can be easily converted to DATV operation.

	====Airspan AS4000====		====Airspan AS4000====

← Older revision		Revision as of 06:05, 28 May 2017
Line 12:		Line 12:


−	A lot of people use the [http://www.titaniumsatellite.com/c1pll Titanium PLL LNB] available from ebay. You can either use the LNB on it's own, build a simple horn from a Marks and Spencer cardboard box covered in tinfoil, shown above, or mount it on a Sky mini dish, shown below, to give more gain.	+	A lot of people use the [http://www.titaniumsatellite.com/c1pll Titanium PLL LNB] available from ebay.
		+
		+	[[File:titanium lnb.jpg\|200px]]
		+
		+	You can either use the LNB on it's own, build a simple horn from a Marks and Spencer cardboard box covered in tinfoil, shown above, or mount it on a Sky mini dish, shown below, to give more gain.

	[[File:G8GTZ antennaes.jpg\|400px]]		[[File:G8GTZ antennaes.jpg\|400px]]