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Yaesu ft-890 sounds high pitched according to a few people I talked to

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Old 02-20-2012, 09:47 AM
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Default Yaesu ft-890 sounds high pitched according to a few people I talked to


They say it sounds fine on my stock mic, but high pitched on my Shure 58... also tried an electret mic and they still tell me it's high pitched... But the stock dynamic mic sounds ok... I hear lots of people say that Yaesu radios tend to be a little lacking in the base range. The radio DOES have a new 2100hz SSB filter... not sure if that is that cause as I am new to Amateur Radios
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Old 02-20-2012, 11:37 AM
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Yeah, the 2.1 is pretty narrow. Yikes! 'Inrad' does make a 2.8 SSB filter that will help out for $170/new and prolly 1/2 priced for used if you can find it. Then you will need to re-center the carrier point for LSB and USB:
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Old 02-20-2012, 11:38 AM
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you may need to adjust the tx IF shift to get the frequency response that best suites you, narrow filters trade fidelity for selectivity,

good luck.
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Old 02-20-2012, 05:51 PM
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looks like I called it then. it is the narrow filters that cause the issue
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Old 02-21-2012, 12:48 AM
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Can the filters be opened up? Or maybe bypassed?
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Old 02-21-2012, 01:18 AM
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filter bandwidth skirt shape and insertion loss are effected by the impedance the filter is terminated with, they only work to spec when terminated with their design impedance,

changing the terminating impedance of the filter will alter its roll off/skirt shape,
inserting series resistors either side of the filter so the filter sees a higher impedance than its designed for broadens the response,
it can cause other issues like more ripple in the response/more insertion loss,

its ok to mess like that in a cb but i would find a wider filter before trying to bodge mod a narrow filter in a hf set.
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Old 02-21-2012, 01:51 AM
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Quote:
Originally Posted by bob85 View Post

its ok to mess like that in a cb but i would find a wider filter before trying to bodge mod a narrow filter in a hf set.
I think you are right... no reason to F up a nearly new INRAD 2.1k filter i am sure someone would be happy to trade for a wider one... To me it is a sad day when I fired up the HR2510 and said, "how does she sound now?" and they reply... "Oh my GOD what did you do!? Whatever it was keep it that way."

When I told them I was running the same mic and mixer setup on my HR2510 as I had on my FT-890, they said, "Well HELL, just ge rid of the Yaesu and keep the 2510!" LOL, NOT GOING TO HAPPEN
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Old 02-21-2012, 01:53 AM
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Quote:
Originally Posted by bob85 View Post
you may need to adjust the tx IF shift to get the frequency response that best suites you, narrow filters trade fidelity for selectivity,

good luck.
the 'shift knob' or is that an internal adjustment?
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