Yaesu 450d no tx or rx from 24-30mhz
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Yaesu 450d no tx or rx from 24-30mhz
Ok so i just got me a yaesu 450d but here is the problem it won't rx or tx from 24-30mhz. I've tried by passing the atu and still the same thing. I've just had a look for dry joints and all seems ok. When i tx it showing on my psu that it's drawing power but the same type of power that it would draw if you had a high swr. I'm not going to send it for repair so please don't recommend shops if i can't get it working it will just stay gathering dust. It has some sentimental value. Any help would be great.
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Re: Yaesu 450d no tx or rx from 24-30mhz
I'm by no means an expert but i would suspect one of the bandpass filter relay's is faulty
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Re: Yaesu 450d no tx or rx from 24-30mhz
It's possible if the radio has been modified to TX on 11m that the bandpass filters have been damaged
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Re: Yaesu 450d no tx or rx from 24-30mhz
The person was using it on 11 meters at the time it went bad. I'll have to dig out a rf probe and check it out when i have the time thanks.Buick Mackane wrote: ↑29 Mar 2023, 16:41 It's possible if the radio has been modified to TX on 11m that the bandpass filters have been damaged
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Re: Yaesu 450d no tx or rx from 24-30mhz
Check VCO voltage(s) first. Use plastic or ceramic tool to adjust. Do not break ferrite cores.
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Re: Yaesu 450d no tx or rx from 24-30mhz
BPF7 is 21.5-33MHz. Is radio working between 21.5 and 24?
Also try to bypass tuner.
Also try to bypass tuner.
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Re: Yaesu 450d no tx or rx from 24-30mhz
It works on 21.5 - 24mhz. I've also tried bypassing the ATU and it's still the same.
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Re: Yaesu 450d no tx or rx from 24-30mhz
Sorry i made i mistake it don't work from 21.500mhz - 33mhz.
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Re: Yaesu 450d no tx or rx from 24-30mhz
Take it you've tried a factory reset ?
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Re: Yaesu 450d no tx or rx from 24-30mhz
So BPF7 or it's logic is suspected. Check if it get switching signal (J2003), than check switching diodes of BPF7, finally bypass it with some capacitor.LondonCbRadio wrote: ↑03 May 2023, 11:17 Sorry i made i mistake it don't work from 21.500mhz - 33mhz.
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Re: Yaesu 450d no tx or rx from 24-30mhz
I Presume he means the band pass filter
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