22-12-2015, 05:26 PM
Hi Mark
Thanks for your advice and useful information.
I have now finished this radio, just 4 more to go. I tried the adjustment with a 10.7 MHz am signal and I agree I could not find a null point where the noise was quietest. So I changed the trimmer for a 10k one, which made no difference but at least it was easier to adjust. (the 4.7k one was a multi turn pot with about 3 turns, it was the only one I had)
The only effect turning the pot had was, it went from quiet to loud.
I did find though that with the telescopic aerial fully retracted and tuned to a weak station, I could find a best point of clear reception with adjusting the pot about 1/3 way from the end stop. So I left it like this.
I have not seen a Hacker RP25 with this type of handle, it clips in like a Roberts, was it original?
Here are a couple of photos.
Thanks
Mike
Thanks for your advice and useful information.
I have now finished this radio, just 4 more to go. I tried the adjustment with a 10.7 MHz am signal and I agree I could not find a null point where the noise was quietest. So I changed the trimmer for a 10k one, which made no difference but at least it was easier to adjust. (the 4.7k one was a multi turn pot with about 3 turns, it was the only one I had)
The only effect turning the pot had was, it went from quiet to loud.
I did find though that with the telescopic aerial fully retracted and tuned to a weak station, I could find a best point of clear reception with adjusting the pot about 1/3 way from the end stop. So I left it like this.
I have not seen a Hacker RP25 with this type of handle, it clips in like a Roberts, was it original?
Here are a couple of photos.
Thanks
Mike
