[MRCA] DC-DC Up Converter

[Mark K3MSB]

Ray and "Milrad" --

Thanks for the info.

My initial goal is to provide a field solution for my BC-221.  It now has a
110 VAC power supply, and I'd like to convert it to 12 V DC.

I need 6.3 V AC/DC and 150V @ 20 mA.      A single battery with the DC-DC
converter should work.

I use LiFePO4 batteries for POTA (Parks On The Air) activities and can run
my IC-7300 at 100W for 2 to 3 hours (which is why I typically run it at
50W).    Since the 211 will only be on intermittently, a single battery
should easily last for 2 days.

I'd generate some heat for the filament dropping resistor, but that doesn't
matter.

73 Mark K3MSB





On Fri, Sep 12, 2025 at 9:21 AM Ray Fantini <RAFANTINI at salisbury.edu> wrote:

> Just finished a DAG radio direction finder using this same converter. Its
> providing 90 volts and replacing a B battery. Built a small box that takes
> the output of a twelve volt SLA Battery and provides 1.5 and 90 volts for
> the direction finder. Found that the inverter was fairly quiet but is
> almost completely lacking any output filtering. It also produced noise on
> the input buss to the battery but keeping everything in a meatal box and
> short it was not an issue. Regulation was ok but did notice there are some
> points where the PWM system on the board will produce weird noise at some
> settings. Think the little inverter is good for low power things like
> replacing B Batteries but would not trust it for things like 225 B+
> supplies in a big radio.
>
>
>
> Ray F/KA3EKH
>
>
>
>
>
> *From:* mrca-bounces at mailman.qth.net <mrca-bounces at mailman.qth.net> *On
> Behalf Of *MilRad via MRCA
> *Sent:* Thursday, September 11, 2025 9:30 PM
> *To:* Mark K3MSB <mark.k3msb at gmail.com>; ARC5 <arc5 at mailman.qth.net>;
> List Milsurplus <milsurplus at mailman.qth.net>; Military Radio Collectors
> Association (mrca at mailman.qth.net) <mrca at mailman.qth.net>
> *Subject:* Re: [MRCA] DC-DC Up Converter
>
>
>
>
>
> I have had good luck with this one.
>
>
>
> https://www.amazon.com/dp/B09KRLGNH7
>
> On 09/11/2025 7:39 PM EDT Mark K3MSB <mark.k3msb at gmail.com> wrote:
>
>
>
>
>
> Hi Folks
>
>
>
> A while back (perhaps a few weeks)  there was a thread on DC to DC up
> converters in which there was one particular unit that quite a few people
> liked.
>
>
>
> I thought I saved that info but didn't.  If anyone has the info, please
> forward.
>
>
>
> Thanks
>
>
>
> Mark K3MSB
>
>
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