G4BAO driver amplifier

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g8gtz
Posts: 875
Joined: Wed Apr 07, 2010 6:26 pm

G4BAO driver amplifier

Post by g8gtz » Fri Apr 06, 2018 8:42 pm

John G4BAO has recently posted the following:

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

See www.g4bao.com for details and how to order.

Please make sure you use the ordering email oscarmax42@ntlworld.com 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 385 times

G8PEF
Posts: 68
Joined: Mon Oct 30, 2017 6:42 pm

Re: G4BAO driver amplifier

Post by G8PEF » Fri Apr 06, 2018 9:25 pm

Noel (or John, if he's watching)...
Are these complete kits (apart from the tinplate box), I.e. PCB, all components and connectors?

John

g4bao
Posts: 1
Joined: Fri Jan 12, 2018 1:14 pm

Re: G4BAO driver amplifier

Post by g4bao » Mon Apr 09, 2018 10:58 am

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 (john@g4bao.com) 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.

73

John

M5TXJ
Posts: 114
Joined: Wed Jul 05, 2017 8:34 pm

Re: G4BAO driver amplifier

Post by M5TXJ » Fri Apr 13, 2018 8:08 am

Kit arrived quickly, thanks John. All built up and just to test.
73 Dave.
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