BATC Forum

Hello all
Advice please.
I'm not a fan of the interconnections diagram for Portsdown. My colleagues at work who are electrical and electronic engineers haven't seen the convention before and this is a project aimed at ATV beginners like me and others. Mostly I can cope by logic except for 2 connections.

Terminal block J05 which connects to 3 boards has a pin 3 TX LED which doesn't appear anywhere else. What is supposed to happen here?

The ADF4351 board is labelled with +5V on the diagram. 4 connections leave the breakout and become 5 at the 4351. On the actual 4351 I see a pin for 3.3V and a socket for 9V i.e. nowt for +5V. Where does this board get its +ve power?

May I have a suggested fuse rating please per the fine G4KLB example seen on the Wiki?

all the best
David M0YDH

Hi David

The Interconnect diagram uses a convention that is common on complex circuit diagrams with multiple parallel signal highways; for example http://www.seeedstudio.com/document/pdf ... ematic.pdf. The Portsdown diagram would look too complex if every wire was represented. However, you have spotted one very minor omission:

Pin 1 of J1C on the 4-band decoder should be labelled TX LED, not TX.

The power connections vary between the available eBay ADF4351 modules, so are left indistinct on the interconnect diagram. In your case, I would suggest connecting the power supply for the ADF4351 to the 9v socket. Do not connect to the 3.3V pin, this is a low voltage output from the module. My ADF4351 was quite happy with 5v input on the 9v pin. Yours may or may not work like this.

Hope that helps

Dave