[MRCA] BC-611 PS

[B. Smith]

I've worked on several radios that have had the power supply installed. 
Evidently the power supply was made in several different versions with 
improvements on the later versions. You may experience a very slight 
amount of inverter noise. For a while the inverter contacts did not seem 
to fit the bottom door contacts on certain models but that seems to have 
been corrected. Take a peak as you close the door to make sure all 
contacts are being made as you may have to make adjustments.
Recently I measured voltages under actual transmitter and receiving 
conditions with fresh batteries and the transmitter  loaded for maximum 
output. (Use Field Strength Meter)
110 VDC on receive.
97 VDC when transmitting (with fresh batteries)

Current draw on the 3 D cells in series powering the high voltage Inverter:
Receive 250 mills
Transmit 510 mills with fresh batteries and transmitter loaded properly.

Turn on: The inverter starts up by sensing filament current draw when 
the antenna is extended on the BC-611. Turns off when the antenna has 
been retracted. I assume a line sense relay is installed for this purpose.

Heating: Ioperated the unit continuously on receive for 5 minutes and 1 
minute on transmit then removed the inverter  but could not feel any 
heat on the inverter case.

CAUTION: Do not test without a proper load. Be careful when extracting 
the unit from the case as I don't think any bleeder resistors were 
installed on all the models but this may have been corrected. Handle 
with care - - keep away from the power supply contacts after removing 
from the radio or discharge with a resistor load.
WANTED: Someone to go to Cape May  with a BC-611  and establish a over 
water contact to Ft. Miles.
Z


On 12/15/2019 11:08 PM, Gene Smar via MRCA wrote:
> Gents:
>
>       I am awaiting delivery of a BC-611F that I just purchased on e-Pay.
> The purchase includes what I found out is a 4 D-cell power supply for both A
> and B batts.  Here's a link to a photo:   https://tinyurl.com/rre5zk7 .  Has
> anyone of you used this?  Or are you at least familiar with its operation?
> I may be able to put the new (to me) -611 on-air within minutes of its
> arrival next week.  I stupidly sold my first -611  (
> http://www.mrca.ar88.net/photo_gallery/2003_meet_pix/Meet_pix_03.html and
> scroll down)   a few years ago at Gilbert and have regretted that decision
> ever since.
>
>       Thanks for any G2 youse can provide.  And Happy Holidays to all.
>
> 73 de
> Gene Smar  AD3F
>
>
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