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TRA931 missing IF transformer
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I have a Syncal missing T4 in the Rx 1.4 MHz IF chain.? I have a suitable core and need a better guess than mine as to the turns ratio needed, if there's anyone technically more qualified than I, which shouldn't be hard, who would be prepared to offer an estimate, I'd be very happy.
It's T4 feeding the base of TR13 from the collector of TR12 on the MA930 board. My guess was either 4:2 or 6:2 turns. 73 - Dan ac6ao / g3ncr |
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It looks like 20:1. 20t on TR12 collector side. The xfmr turns ratios are marked on the TR48 (same as TRA931) schematic from Radiomuseum.org. On my TRA931, I had one xfmr completely broken off the PC board and one with half the leads snapped. Luckily I was able to strip and resolder what was left of the leads. The TR48 schematic was more helpful to me than the TRA931 schematics. 73 Bill KE3BK On Sat, Jun 22, 2024 at 18:39 Dan Rae via <danrae=[email protected]> wrote: I have a Syncal missing T4 in the Rx 1.4 MHz IF chain.? I have a |
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On 6/22/2024 7:41 PM, William Wuttke wrote:
It looks like 20:1. 20t on TR12 collector side. The xfmr turns ratios are marked on the TR48 (same as TRA931) schematic from Radiomuseum.org.Thank you Bill!? That's a great help, and I'll try that tomorrow.? I have an original Racal manual, but I find now I need it that some pages are missing.? I'll try to find the one you mention. 73 - Dan ac6ao / g3ncr |
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