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Use your signal generator to inject the appropriate frequency into the mixer instead of the DDS and see whether you receive a signal.

If you receive any signal that eliminates a faulty DDS.
After that start checking from the AF amplifier working your way to the antenna.

Regards

Lawrence

On Sun, Sep 8, 2019 at 5:21 PM Roger Tuffin <roger.tuffin@...> wrote:

Thank you Raj. I really need to get some signal to know that the DDS board is ok. As it stands, I think its duff.?

Roger

On 8 Sep 2019, at 2:43 pm, Raj vu2zap <rajendrakumargg@...> wrote:

Roger,

Take the two antenna wires black and brown and twist them to minimize radiation and solder the black to the SO239 ground tab and
brown as you done. Keep those wires as short as possible.

Do the same for the Raduino RF out to the mother board.

All the long wires will add to the tuning click problem.

Raj

At 08-09-19, you wrote:

Thank you Vic.? The antenna is a 30’ vertical connected with RG213.? I have tried several aerials without hearing anything other than the clack clack of the tuning, whether the aerial is connected or not.? The display does indicate a frequency as you tune, although the range varies which you say is a design feature.

All the loose ends are taped as suggested in the online walk through.? I should have waited before buying the metal case which ended up costing more that the boards!? There are few connections necessary to get a signal that I’m thinking that the DDS board is faulty.

Picture of unit below.

Roger

On 8 Sep 2019, at 10:39 am, Vic WA4THR via Groups.Io < vhklein@...> wrote:

The frequency starting to step up or down at the ends of the tuning pot rotation is normal and part of the design to allow moving the tuning range. If you remember old SW receivers, it is kind of like the tuning is the bandspread control and at the ends you are adjusting the main tuning. Also, with no antenna connected the "clicks" when tuning are typical. If you upgrade to the Allard Munter sketch, those will be largely eliminated and you can further adjust the tuning range to your liking.

So, some more information is needed to understand the issue. What antenna do you have on the radio? Does the display indicate frequencies as you tune? Can you post a picture of the board and wiring?

=Vic=

?