philips: LD452AB ; UKW-Koffersuper

Where exactly does the VHF aerial coax connect to on the Chassis? It's only connected to what used to be the telescopic aerials.

I presume my set is this set as the remaining part of valve layout label shows a DC90 in the first position instead of a DF97.

When you remove the Chassis from case there is a set of tags and a Resistor sized RF choke on the front of VHF tuning module. I presume this might be where it was pulled off?

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I think it's clear where the coax cable goes. I will add a photo later if/when the radio is working!

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Anyone working on the VHF section of this set will appreciate the information in DC90 as Additive Mixer article. Joe Sousa has added to the main article a good description of the alignment issues for Local Oscillator.

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For those confused as to what a DEAC is (probably anyone not involved with restoring a German Portable, or not having used vintage Remote Control Aircraft) here is the Manufacturer page. It took me a while to find as a simple Google search suggests Varta (the actual owner though) not Deutsche Edison-Akkumulatoren-Company GMBH. The DEAC D2 would appear to be not much different in capacity (a little more than 2000mAH?) to a modern AA size NiMH, though it's much larger. In the 1970s an AA size NiCd from Sanyo was about 450mAH and NiMH in 2011 vary in capacity from 1800mAH to an optimistic 2800mAH. The capacity of a D size cell (similar size to Kofferradio DEAC?) varies from 2500mAH (likely an AA cell in a D box as it feels very light) to 10,000mAH in 2011. Capacity of NiMH C cells is commonly 3500mAH.

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Are there dimensions anywhere and a scan of the battery case / card for the battery used?

The Ever Ready B117 (= Vidor L5515) is a 90V HT battery with the same snap on connectors, but I think a smaller size?

I want to make up an "actual size" pack using CR2032 coin cells rather than PP3 as they are only 9 cents each (in 100s inc postage, Euros). I used 6 stacks of 26 cells connected together via 6 x 1N4148 for a B126 (total cost under €16 for maybe 150hrs). For intermittant use shelf life can be 15 years and for continious use if you can get per stack current down to about 1mA you get nearly 150 to 200 hrs for a pack.

Cheap Zinc Carbon PP3 are olny about 8 to 16hrs good operation (usually 6 stacked rectangular cells) and good Alkaline now seem to use 6 x AAAA cells (600mAH or less, down to 200mAH maybe at 10mA), 20 to 50 hrs use depending on HT current (usually between 5mA and 15mA).

NiMH PP3 have several issues for HT application :

1) Charging many in series

2) Per pack is nominal 78 vs 90 if 6 cells per PP3

3) About 200mAH only

4) High self discharge. Unless "Eneloop" type, could be "flat" in a month.

5) Cell reverse charge on discharge.

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Is this Pertrix 78 the size used?

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Yes, this is the correct H.T. battery. I found an elder specimen from about the mid 1960s in my Philips LD452AB. Two more pictures are loaded to the battery's page.

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