Hints for 436MHz DATV driver (appr. 10-20W, gain appr. 15dB)

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PE5PVB
Posts: 155
Joined: Sun Sep 02, 2012 6:51 pm

Hints for 436MHz DATV driver (appr. 10-20W, gain appr. 15dB)

Post by PE5PVB » Wed Aug 04, 2021 1:00 pm

Any hints for an amplifier design for 70cm, need 10W power with appr. 250mW input at 28V.

g0mjw
Posts: 2332
Joined: Sat Sep 20, 2014 9:15 am

Re: Hints for 436MHz DATV driver (appr. 10-20W, gain appr. 15dB)

Post by g0mjw » Wed Aug 04, 2021 1:13 pm

Search Digital RF Power Amplifier UHF on Ebay or AliExpress. Not 28V though. The 80W version should be good for 10W DATV.

Mike

Pa3fbx
Posts: 178
Joined: Fri Oct 16, 2020 1:08 pm

Re: Hints for 436MHz DATV driver (appr. 10-20W, gain appr. 15dB)

Post by Pa3fbx » Thu Aug 05, 2021 8:05 am

We Got very Nice results With the ra60 and ra30 modules.. they are intendent for the FM but you can increase the bias to 5 volt making the module into class a. Pulling 5 to 6 Amp on 13 volt. With these settings your het 10w dvb-s With Pluto directly connected. EG. 1mw in.. on a ra30.. and 7 to 8 watt out a ra60.
Ra30 van make 15 to 20 watt dvb-s clean. Ra60 up to 30w clean .
The modules are narrrowband so they Filter clean the harmonics. Without any LPF you get 50 to 55db easy.
A 20db preamp. Is whise to run your Pluto at -10 dbm max .

Benno

vk3jma
Posts: 12
Joined: Fri Oct 30, 2020 12:21 am

Re: Hints for 436MHz DATV driver (appr. 10-20W, gain appr. 15dB)

Post by vk3jma » Sat Oct 09, 2021 12:06 am

Hello,
Do you have a link to the RA30/60 modules you mention?

g0mjw
Posts: 2332
Joined: Sat Sep 20, 2014 9:15 am

Re: Hints for 436MHz DATV driver (appr. 10-20W, gain appr. 15dB)

Post by g0mjw » Sat Oct 09, 2021 7:50 am

No. They are no longer manufactured. You will need to search for them yourself locally. Mini-kits may have some left. RF Parts, Enigma Component Shop etc.

E.g. 2m RA80H1415M1 70cm RA60H3847M1, SAU82L, 23cm RA18H1213G

Mike

Pa3fbx
Posts: 178
Joined: Fri Oct 16, 2020 1:08 pm

Re: Hints for 436MHz DATV driver (appr. 10-20W, gain appr. 15dB)

Post by Pa3fbx » Wed Oct 27, 2021 9:07 pm

You can find lots of RA modules on ebay, alliexpress and so on..
Also the boards to connect the lot are there..
Whatchout for the blue rf relais as they tend to burnout is you like 60 watt and bad swr..
They are fine up to 20 or 25 watt.

Best regards
benno

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