[ARC5] RAK-5 and RAL-5 Receivers
Roy Morgan
k1lky68 at gmail.com
Sun Apr 28 17:53:18 EDT 2019
EXCESSIVE HEAT? I wonder. The whole receiver consumes only a few watts, and it’s quite big with lots of surface area to dissipate that “heat”.
It has been a long time since the RAL and RAK here have been running, but I expect a short time till they run again. I will notice both the heat and the values of those resistors. MAYbe those resistors themselves are running up toward their rated dissipation. I think unlikely though.
Thanks for the info.
(I’m sorry to not be anywhere near the pair that may be available in Arkansas! If an RAL and RAK pair are good, then two pairs must be better, right??)
Roy
> On Apr 28, 2019, at 12:20 PM, Robert Eleazer <releazer at earthlink.net> wrote:
>
> From the US Navy's Electron Magazine of July 1945
> It has been found that the carbon resistors used in the bleeder and screen-dropping circuits of the RAK-5 and the RAL-5 receivers are notorious for changing value. This is apparently due to the fact that they are incapable of withstanding the excessive amount of heat that is generated in these units.
Roy Morgan
K1LKY since 1958
k1lky68 at gmail.com
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