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G4BAO driver amplifier

Posted: Fri Apr 06, 2018 8:42 pm
by g8gtz
John G4BAO has recently posted the following:

My new 3W SSB/CW, 500mW DATV 70cm driver board kit is now available.

See for details and how to order.

Please make sure you use the ordering email for PayPal! Otherwise your money will go in to a black hole, never to be seen again and you won't get a kit!

G8GTZ says:

I have tested one of these on the output of a Portsdown with a 3dB pad in circuit and can confirm they will produce +27 dBm (500 milliwatts) with 30 dB shoulders (as shown in the picture) so make a very useful driver or low power PA stage for DATV.

Without the pad it produces +29 dBm but with 25 dB shoulders so it advised that the Portsdown is always used with a 3dB attenuator or long piece of co-ax before the amplifier.

12 Pdown 3db 550ma (Small).JPG
12 Pdown 3db 550ma (Small).JPG (74.78 KiB) Viewed 1556 times

Re: G4BAO driver amplifier

Posted: Fri Apr 06, 2018 9:25 pm
by G8PEF
Noel (or John, if he's watching)...
Are these complete kits (apart from the tinplate box), I.e. PCB, all components and connectors?


Re: G4BAO driver amplifier

Posted: Mon Apr 09, 2018 10:58 am
by g4bao
Hi Folks.
The kit's PCB has an input PI attenuator using 0603 resistors on its input. It comes with the parts for a 3dB pad but you can fit whatever attenuator from 0 to whatever you like with suitable resistors or a zero ohm link.

I will be bringing kits to Martlesham at a special UKuG/BATC member's only price of £25 cash (no cheques/or paypal) and Alan G3NYK will have a supply of tin plate boxes and connectors. I'd appreciate it if you'd email me ( before Friday of this week if you are planning to buy a kit so I can make sure I make up enough during Friday to avoid disappointment.



Re: G4BAO driver amplifier

Posted: Fri Apr 13, 2018 8:08 am
by M5TXJ
Kit arrived quickly, thanks John. All built up and just to test.
73 Dave.