[MRCA] [MMRCG] BC-652 Receiver

Wed Jun 5 22:17:21 EDT 2024

Be prepared to identify the operating frequency of the inverter and then 
add proper noise reduction techniques.
Z
http://k4che.com/Tempvideo/Zenith/Zenith%20k4che.mp4

On 6/5/2024 8:45 PM, J Mcvey via MRCA wrote:
> They used to have then on Ebay...but I found one on Newegg.
> www.newegg.com/p/0JF-01KG-01W46?item=9SIAXRNK4N7790&nm_mc=knc-googleadwords&cm_mmc=knc-googleadwords-_-at+-+body-_-fyuu-_-9SIAXRNK4N7790&source=region&srsltid=AfmBOooN3npWDPBH_lBFSGO20c0yi_Mf3MGbBpe8iWllDOvtKVqAMa4ILsQ&com_cvv=8fb3d522dc163aeadb66e08cd7450cbbdddc64c6cf2e8891f6d48747c6d56d2c 
> <https://www.newegg.com/p/0JF-01KG-01W46?item=9SIAXRNK4N7790&nm_mc=knc-googleadwords&cm_mmc=knc-googleadwords-_-at+-+body-_-fyuu-_-9SIAXRNK4N7790&source=region&srsltid=AfmBOooN3npWDPBH_lBFSGO20c0yi_Mf3MGbBpe8iWllDOvtKVqAMa4ILsQ&com_cvv=8fb3d522dc163aeadb66e08cd7450cbbdddc64c6cf2e8891f6d48747c6d56d2c>
>
>
> 	
>
> 	
>
>
>     DC-DC Converter,12V to 100V-250V Voltage Boost Step-up Power
>     Supply Modu...
>
> Buy DC-DC Converter,12V to 100V-250V Voltage Boost Step-up Power 
> Supply Module with fast shipping and top-rated ...
>
> <https://www.newegg.com/p/0JF-01KG-01W46?item=9SIAXRNK4N7790&nm_mc=knc-googleadwords&cm_mmc=knc-googleadwords-_-at+-+body-_-fyuu-_-9SIAXRNK4N7790&source=region&srsltid=AfmBOooN3npWDPBH_lBFSGO20c0yi_Mf3MGbBpe8iWllDOvtKVqAMa4ILsQ&com_cvv=8fb3d522dc163aeadb66e08cd7450cbbdddc64c6cf2e8891f6d48747c6d56d2c>
>
>
>
> On Wednesday, June 5, 2024 at 07:14:42 PM EDT, J Mcvey via MRCA 
> <mrca at mailman.qth.net> wrote:
>
>
> It might be interesting and quick to use one of the boost regulators 
> on eBay than can convert 12v. To 250v. Probably will have to be in a 
> box with. Chokes on the I/O ports6 to mitigate rf noise, but should do 
> the trick.
>
>
> Yahoo Mail: Search, Organize, Conquer 
> <https://mail.onelink.me/107872968?pid=NativePlacement&c=Global_Acquisition_YMktg_315_EmailSignatureGrowth_YahooMail:Search,Organize,Conquer&af_sub1=Acquisition&af_sub2=Global_YMktg&af_sub3=&af_sub4=100000945&af_sub5=OrganizeConquer__Static_>
>
>     On Tue, Jun 4, 2024 at 2:35 PM, Ray Fantini via groups.io
>     <RAFANTINI=salisbury.edu at groups.io> wrote:
>
>     Often, we take up projects that we had no intention of doing, just
>     somehow, they take on a life of their own. During Hamvention while
>     viewing a small part of the W4VAG estate saw this BC-652 receiver.
>     It was hacked with a poorly installed AC power supply, was filthy
>     dirty and missing its case. It almost appeared as it was only fit
>     for the scrap pile.
>
>     I am always thinking about what new or different radio can be used
>     for the 3885 AM Net at Hamvention and that along with the fact
>     that I have never owned a 652 was all it took. Brought the radio
>     back home and started by removing the AC power supply that would
>     have been a disaster if somehow it were activated, the speaker and
>     S meter circuit that was hacked into the set, spent couple hours
>     cleaning all the layers of dust, dirt and mud from the chassis and
>     started to replace a lot of the wiring to its original state.
>     After getting that all straight and getting the filaments all up
>     and running turned to B+ testing. Wow, before it was all over
>     found that every “Black” chicklet capacitor in the screen, plate
>     and cathode circuits were serious leaky or shorted. Couple of the
>     oil filed capacitors were also major current drains too. So now
>     all that’s sorted and the receiver is working relatively well on
>     eighty meters so the next step will be getting B+ from twelve
>     volts DC.
>
>     Originally the radio had a fourteen-volt dynamotor on the
>     calibrator – power deck above the radio but whoever hacked the
>     radio originally removed all that and it’s all long gone. Being I
>     only intend to use this radio in the field have no interest in an
>     AC supply and want to do something so it can be run from a storage
>     battery next year at Hamvention.
>
>     One idea is to buy a NARCO T-12 power supply over on the bay and
>     hack that up to provide the two hundred volts or so or but
>      thought I would try asking here if anyone had an old Motorola, GE
>     or RCA Two Way hybrid radio that I can get the power transformer
>     from so I can throw together a inverter to run this radio.
>
>     I know that there are tons of Chinese power blocks that can more
>     than do this but just would not be right using something like that
>     and am not afraid to build up a solid-state inverter to run the
>     radio. It’s just that when I built a inverter for the Canadian WS
>     that I just did from scratch ran into issues getting a transformer
>     that would work with square wave switching and figure this time if
>     I start with a transformer designed for switching transistors or
>     vibrators that would avoid a lot of trouble.
>
>     Attached are a couple pictures, one before I started and where the
>     receiver is today. As is with most projects will do a video
>     eventually.
>
>     Ray F/KA3EKH
>
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