[Milsurplus] BC-312

[GENE BALINSKI]

Any switching converter from China is effectively a military-grade jammer.  The Chinese  do not care about US FCC or anything like that. 

 I have an Ebay Chinese  AC switching converter  that I bought as a direct replacement for a Dell computer power supply.   I cannot listen to BCB when it is plugged in.  It also raises the HF noise level to S-7 - S-9 across the band until abou 10m.   However, a vhf/uhf scanner located in the same room will get de-sensed and noisy. 

Best advice it so avoid ALL electronics from China if at all possible. 

73,
Gene K1NR  

   
> On 10/26/2022 11:18 AM David Olean <k1whs at metrocast.net> wrote:
> 
>  
> I tried a similar DC -DC converter from China on my RA-10 receiver. I 
> located it inside the radio and found that I had to shield the bejeesus 
> out of it to keep the digital hash from the receiver input! It ended up 
> inside a metal can with bypassing and ferrites all over it.  My unit was 
> quite noisy. It is especially troubling when your receiver covers the 
> long wave frequencies. Mine ran at 210 volts DC with a 28 VDC primary 
> input. Be prepared to shield it in the radio.
> 
> Dave K1WHS
> 
> On 10/26/2022 8:07 AM, David Stinson wrote:
> > I've ordered a couple of these to try:
> > https://www.amazon.com/dp/B08SLFSRL6
> > Claimed to source 100mA at 100-230VDC
> > with 4-15V input.
> >
> > I've powered some small receivers with some
> > of the older High-Voltage inverters. The
> > "Yellow ones" have some birdies and they
> > top-out at about 45mA- enough to run
> > an ARC-5 at low B+.
> >
> > We'll see how noisy is this new one.
> >
> > GL OM ES 73 DE Dave AB5S
> >
> > P.S.  Another interesting one:
> > https://www.amazon.com/dp/B0992GCCSK
> > If you have a small receiver or QRP
> > transmitter that sips no more than 40mA,
> > this one has a filament voltage regulator
> > and will do HV 150-420V.  Has feedback indicating
> > that the MOSFET  (IRF840) is a bad Chinese knock0ff
> > which can die early (no heat sink compound)
> > and if you replace it with a known-quality FET,
> > it will then work for you.
> >
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