Warlow Bradley radio

ual.

A "Barlow Wadley XCR-30" portable shortwave receiver.

I get the idea it's not something a novice without RF test gear can tackle.

.... Phil

Nice radio. Well-designed, too by the look of it.

nual.

e.

It's probably the best portable shortwave radio at that point (early=20 seventies), it's certainly the first to convert to a fixed range of=20 tuning.

Wadley of course invented his Wadley loop, as seen in a Racal receiver or= =20 two, then was involved in this transistor portable in South Africa in the= =20 seventies. Confuses people, they think it's a Barlow Wadley Loop, when=20 Barlow is the name of the radio company. I've never heard of any other=20 products they made, but perhaps other than this one, they were only in the= =20 domestic market.

There is at least one website about the Wadley Loop, which includes=20 information about the various radios that used them. After this radio=20 came out, there were some other consumer radios (but all desktop) that=20 used the Loop, the Yaesu FRG-7, a Drake, and some that were variatns of=20 those. It was right on the cusp, one minute digital synthesizers too=20 bulky and or expensive, then a few years later Sony coming out with the=20

If there is no website devoted to the XCR-30, then there are pages from=20 people who have gotten them going.

Though, there were analog synthesizers that were about the same=20 complication as the Wadley loop, except it didn't add a conversion to the= =20 signal path. The HRO-500 is an example. Though due to some similarity,=20 the two methods get confused. I once posted about this, and the post=20 landed on the Wadley Loop page, but "edited" so it looks like I'm saying=20 the HRO-500 did use the Wadley loop. The real similarity is that both had= =20 you tuning for a beat, and some of the receivers had an audio amplifier=20 feeding the speaker to accomodate this, that was both Wadley Loop and=20 synthesizer receivers.

If it's not working, probably the electrolytic capacitors need replacing.= =20 I can't remember if people have had transistor issues, it came late enough= =20 that they won't be germanium.

But if it needs aligning, it is a complicated receiver. There's a=20 passband filter somewhat higher than 30MHz, and if that is mistuned, it=20 can cause problems since it's part of the "loop". But once you leave the= =20 loop section, it can't be that complicated a receiver. On the other hand,= =20 it's a portable, designed to be small rather than accessible.

Michael