[MRCA] MRCA Digest, Vol 248, Issue 28

[wildbillk0ikp (null)]

Prosperous New Year to all.  I was wondering what components,  sizes, and configuration would you use to filter the Chinese converters.  Ther work fine on ARC-5 and BC-348’s but are noisy.  73, Thanks, Wild Bill, K0IKP.
Sent from my iPhone

> On Dec 28, 2024, at 08:49, mrca-request at mailman.qth.net wrote:
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> Today's Topics:
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>   1. Saturday Southern M&S Net (Ray Fantini)
>   2. grc109 r1004 receiver ebay dc dc converter (JEFF CICCONE)
>   3. Re: grc109 r1004 receiver ebay dc dc converter (Robert Nickels)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Fri, 27 Dec 2024 19:02:40 +0000
> From: Ray Fantini <RAFANTINI at salisbury.edu>
> To: "mrca at mailman.qth.net" <mrca at mailman.qth.net>, MMRCG
>    <MMRCG at groups.io>
> Subject: [MRCA] Saturday Southern M&S Net
> Message-ID:
>    <DM8P220MB047255489BC865D296EE0EA1B80E2 at DM8P220MB0472.NAMP220.PROD.OUTLOOK.COM>
>    
> Content-Type: text/plain; charset="iso-8859-1"
> 
> With everyone tied up with the holidays and due to there being rain forecast tomorrow morning I will not be attempting another call of the Moose & Squirrel Net Southern edition tomorrow.
> I am thinking that one Saturday in January I will drag the mutt out and operate from the field for that net.
> Happy New Year all!
> 
> Ray F/KA3EKH
> 
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> ------------------------------
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> Message: 2
> Date: Sat, 28 Dec 2024 07:34:52 -0500 (EST)
> From: JEFF CICCONE <kg2bz at comcast.net>
> To: Military Radio Collectors Association <mrca at mailman.qth.net>,
>    "milsurplus at mailman.qth.net" <milsurplus at mailman.qth.net>
> Subject: [MRCA] grc109 r1004 receiver ebay dc dc converter
> Message-ID: <1371564546.1534790.1735389292639 at connect.xfinity.com>
> Content-Type: text/plain; charset="utf-8"
> 
> folks. looking at using this epay chinesium dc dc converter for portable operation.  does anyone have experience with using these as far as quality, receiver noise, etc
> 
> https://www.ebay.com/itm/283294832260
> 
> DC-DC 12-90V to 12V-130V Boost Converter 900W CV CC Step Up Voltage DC Module Xr
> 
> thanks Jeff N2IA
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> Message: 3
> Date: Sat, 28 Dec 2024 09:48:59 -0600
> From: Robert Nickels <ranickels at gmail.com>
> To: mrca at mailman.qth.net
> Subject: Re: [MRCA] grc109 r1004 receiver ebay dc dc converter
> Message-ID: <be99a7b8-beb1-42d1-9c98-c52f9a6e92cd at gmail.com>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
> 
>> On 12/28/2024 6:34 AM, JEFF CICCONE via MRCA wrote:
>> folks. looking at using this epay chinesium dc dc converter for
>> portable operation. ?does anyone have experience with using these as
>> far as quality, receiver noise, etc
> 
> I haven't used that particular one but like most, the seller doesn't
> have a clue and the specs are nonsense.? No way will you ever get 900
> watts out of that thing.??? In general,? you can have something near the
> specified voltage but not at the specified current or power.? Even his
> own load tester shows 142 watts output and I wouldn't want t put my
> finger on the heatsink at that level for very long!?? The only way to
> know what it's capable of is to buy one and test it or find someone else
> who knows their stuff that has done so.
> 
> The more common type can be found by searching "ZVS? 45-390V" - they are
> now selling for < $5 shipped and work well as long as you derate them
> and provide sufficient filtering/shielding for your application.?? The
> schematic of this design is also available as are replacement parts? and
> it's been around long enough to have become a "standard" that is
> available from numerous sellers.?? The switching frequency is 75 kHz and
> I run the output voltage no higher than 300V, where they will supply up
> to 20 watts.?? Be sure to bypass the supply leads if you're using them
> to run a transmitter as RF will definitely kill the controller IC.
> 
> 73, Bob W9RAN
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> End of MRCA Digest, Vol 248, Issue 28
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