DTX1 amplifier?

Help and support for the BATC DTX1 ATV digital encoder and modulator system
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VE4NSA
Posts: 6
Joined: Sun Nov 17, 2013 2:53 am

DTX1 amplifier?

Post by VE4NSA » Sun Nov 17, 2013 2:58 am

Would appreciate some recommendations for an RF amplifier for the DTX1 for 1.2 GHz. Like to move the -5db to +20 or higher.

Thanks,

Stefan, VE4NSA

g8gtz
Posts: 1165
Joined: Wed Apr 07, 2010 6:26 pm

Re: DTX1 amplifier?

Post by g8gtz » Sun Nov 17, 2013 8:25 am

Hi Stefan,

The PGA 103 amplifier published in the last CQ-TV is ideal as a first stage driver with performance as shown below and you could possibly use 2 stages with careful gain balancing.
PGA103.jpg
PGA103.jpg (129.75 KiB) Viewed 6011 times
However, in the next edition of CQ-TV (publication date December) there will be an article on a PA stage which has been designed to be driven by the PGA 103 and gives 2.5 watts when used for narrow band operation - DATV operation has not yet been fully evaluated but should be similar. We are looking at the potential of stocking the PCB and or components / kits in the BATC shop.

Minikits in Australia also have a number of kits / amplifiers which can be used with the DTX1 / Digilite.

Best 73

Noel - G8GTZ

G8XZD-TV
Posts: 94
Joined: Fri Feb 22, 2013 6:41 pm

Re: DTX1 amplifier?

Post by G8XZD-TV » Sun Nov 17, 2013 11:48 am

Would be interested in a PGA 103 amplifier kit/board if that is what the club is looking to stock. Anything that can get a useful starting power from the milliwatt level would be good without having to incur postage/customs costs from the states or Oz.

Have had some success with the g4ddk board but it is a bit on the fragile side.

Ian

VE4NSA
Posts: 6
Joined: Sun Nov 17, 2013 2:53 am

Re: DTX1 amplifier?

Post by VE4NSA » Sun Nov 17, 2013 8:27 pm

Thanks!

Good info and I enjoyed reading the article in the CQ-TV. I ordered the Minikit amp. I am also looking at their transverters to get the signal up to 2.4Ghz. We will see how that goes.

73, Stefan (VE4NSA)

M0ATV
Posts: 81
Joined: Fri Aug 13, 2010 6:00 pm

Re: DTX1 amplifier?

Post by M0ATV » Sun Dec 29, 2013 10:38 pm

Yes looking forward to getting some "real" power out again, via the Digilite I had no problem with use of G4DDK mini amp into my M68719, could drive that to 10w output easily, with same setup into DTX1 not getting more than 10mW, a massive drop, tried the PGA-103 amp kit from MIni Kits & another PGA-103 map from G4DDK in series, into M68719 & getting a huge 2w output, so still need to find another method.

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