UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Questions on 160/80 metre AM transmitters.

Bazz4CQJ · 17th Dec 2022, 5:29 pm

In the 1965 SWM review on page 337, there's a comment that on 80m, the 12W from the AT5 invariably got through OK on contacts which had been kicked off with a 100W Tx, which is telling!

How critical would the matching be of the centre-tapped winding on the transformer used for the modulator? I'm wondering about whether the transformer from a Pye Ranger could be used, using the centre tapped winding originally used by the push-pull EL90's in the Ranger modulator ?

B

17th Dec 2022, 5:29 pm	#14
Bazz4CQJ Dekatron Join Date: Apr 2009 Location: Oxfordshire, UK. Posts: 4,935	Re: Quick question on the CODAR AT5, if anyone has one to hand. In the 1965 SWM review on page 337, there's a comment that on 80m, the 12W from the AT5 invariably got through OK on contacts which had been kicked off with a 100W Tx, which is telling! How critical would the matching be of the centre-tapped winding on the transformer used for the modulator? I'm wondering about whether the transformer from a Pye Ranger could be used, using the centre tapped winding originally used by the push-pull EL90's in the Ranger modulator ? B __________________ Saturn V had 6 million pounds of fuel. It would take thirty thousand strong men to lift it an inch. Last edited by Bazz4CQJ; 17th Dec 2022 at 5:37 pm.