Re: poor/distorted tx audio
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If you decide to go with the Eliot ESP designs, this transformer can work extremely well. Several members of our shortwave listeners club use these to interface their radio to their PC for data decoding.
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One guy is a ham and uses them for both HF data and VHF data.
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G26936A + (Pkg 2) Walters OEP-1200 600 Ohm to 600 Ohm Miniature Isolation Transformer
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Walters OEP-1200 600 Ohm to 600 Ohm miniature low profile line isolation transformer is rated to comply with the relevant requirements of BS6305. Size is 0.71" sq x 0.5" tall. Has 4 pins on bottom and has an insertion loss of 1.5 dB max at 2KHz. Return loss is -20dB @ 200 Hz to 400 Hz and balance is better than 80 dB 200 Hz to 400 Hz. New. Sold in a package of 2.
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https://theelectronicgoldmine.com/products/g26936a?_pos=22&_sid=069c097ea&_ss=r
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Actual Walters specification sheet, below the Farnell blurb at the top.
https://www.farnell.com/datasheets/13721.pdf
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Note: I've purchased quite a bit of stuff from Electronic Goldmine with no problems. I have nothing to do with them other then as a customer.
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A "better" transformer might be Triad "Red Devil" transformers. I think Mouser and Newark carry them.
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