Home |
Search |
Today's Posts |
#4
![]() |
|||
|
|||
![]() "Brian Hill" ) writes: I just bought these two off Ebay and was wondering if anybody has any experience with these two radios. I bought em both for obvious collector reasons. The R-530 has the Wadley loop circuit which I'm interested in. And I got the SW1 because it's one of the first micro portables with descent performance and I collect Sony's. I would like to find the Original Barlow Wadley XCR-30 someday. Look again, the Galaxy does not use a Wadley loop. It uses a phase locked loop synthesizer to generate the first local oscillator signal every 500KHz (or is it 1MHz in the Galaxy?). A Wadley loop, while providing the same overall effect, is a result of the right mixing, adding and subtracting, in the signal chain. What confuses people is that the design of the synthesizer in the Galaxy uses a similar bit to the Wadley, putting the reference frequency through a multiplier that puts out signals at every harmonic of that reference. IN the Wadley, that signal is used to generate the needed beat signals, in the Galaxy that signal is compared to the local oscillator in a phase detector to lock the local oscillator. Visually change the multiplier to a programmable divider chain, and in the Galaxy you'd have a more recognizeable synthesizer. It just came before programmable dividers were cost effective, just as the case with the National HRO-500, so they went with the muliplier, though there is a tradeoff in use and performance compared to a synthesizer with a programmable divider. Change the mulitplier in the Wadley to a divider, and the thing won't work at all. Michael |
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Forum | |||
keyclown radio dealers busted in spokane WA and walcott IW | CB | |||
Sony CFM-140S | Shortwave | |||
New CBer, asking about Galaxy CB radios | CB | |||
Sony 7600 GR Reception of WGN Chicago (AM 720) | Shortwave |