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neon indicator · 30th Jun 2011, 6:29 pm

I made up the AD4 (in paper) correct size. It's huge. must have been 6 x D cells.

Was thinking maybe B114 with 2xC cells in parallel (selected new and measured) and 38 x AAA cells. (38V to 51V, about 46V average). Three of these will sit along back/bottom almost full width of the suitcase. The HT paralleled by diodes and denergised relays. In Transmit the 45V part of circuit is fed from one box and the other two added in series for 3 x 45 = 135V TX P.A. (1p24b). The valves heaters in 3 matched sets to connect separately to the LT batteries, so that's 6 x 3500mAH heater capacity.

But the AAA are nearly as expensive as AA, so I will go with 3 rows of 6 staggered columns of 2 x AA NiMH total 36 cells in the B104 "45V" box. Seems same size as B114, so three fit suitcase well. The RX will then have 3 x 2500mAH @ 43V nominal (49.5V peak) = 7500mAH HT, 35V approx "flat" and thus TX mode will be 2500mAH 130V Nominal 150V peak. About 108V near "flat", tapped at 43V nominal.

The RF PA valves used for RX loudspeaker Audio PA at 43V nom.

And just use regular battery holders for the C or D cell LT supply.

I see some cheap 3000mAH NiMH on eBay. I don't know that I really believe there are 3000mAH AA cells. The C cells are usually 3,500mAH. Some 4000mAH.

In any case I will use bench PSU till radio finished as 108 x AA NiMH is somewhat of an investment! (x12 the capacity of using PP3s though).

I have a nice 8" speaker and will cut the Pye rising sun + clouds as the grill.
What you think?

30th Jun 2011, 6:29 pm	#12
neon indicator Retired Dormant Member Join Date: Jun 2010 Location: Co. Limerick, Ireland. Posts: 1,183	Re: Battery Boxes. I made up the AD4 (in paper) correct size. It's huge. must have been 6 x D cells. Was thinking maybe B114 with 2xC cells in parallel (selected new and measured) and 38 x AAA cells. (38V to 51V, about 46V average). Three of these will sit along back/bottom almost full width of the suitcase. The HT paralleled by diodes and denergised relays. In Transmit the 45V part of circuit is fed from one box and the other two added in series for 3 x 45 = 135V TX P.A. (1p24b). The valves heaters in 3 matched sets to connect separately to the LT batteries, so that's 6 x 3500mAH heater capacity. But the AAA are nearly as expensive as AA, so I will go with 3 rows of 6 staggered columns of 2 x AA NiMH total 36 cells in the B104 "45V" box. Seems same size as B114, so three fit suitcase well. The RX will then have 3 x 2500mAH @ 43V nominal (49.5V peak) = 7500mAH HT, 35V approx "flat" and thus TX mode will be 2500mAH 130V Nominal 150V peak. About 108V near "flat", tapped at 43V nominal. The RF PA valves used for RX loudspeaker Audio PA at 43V nom. And just use regular battery holders for the C or D cell LT supply. I see some cheap 3000mAH NiMH on eBay. I don't know that I really believe there are 3000mAH AA cells. The C cells are usually 3,500mAH. Some 4000mAH. In any case I will use bench PSU till radio finished as 108 x AA NiMH is somewhat of an investment! (x12 the capacity of using PP3s though). I have a nice 8" speaker and will cut the Pye rising sun + clouds as the grill. What you think?