Re: [IRCA] DXing with a One Tube Radio

["Len Hyde" <donutbandit@xxxxxxxxx>]

Now, this is the kind of thing I would love to try, and have contests with.


On Mon, Dec 29, 2008 at 8:39 PM, Deane McIntyre <dmcintyr@xxxxxxxxxxx> wrote:
> Some of you may recall the books by Alfred Morgan such as The Boy
> Electrician and The Boys First Book of Radio and Electronics that
> had instructions on how to build, among other things, crystal radios
> and a one tube regenerative radio. In the case of the regenerative radio,
> a 1H4H triode tube was used with the filament operated off a 1.5 volt D cell
> and a 45 volt battery for the plate voltage. Later editions used a 6BF6 tube
> instead as the 1936 vintage 1H4G tube became difficult to find. The circuit
> was close  to that used in the early radios of the 1921 - 1925 time period,
> when AM broadcasting was getting started.
>
> Having read that in those days of few stations these one tube regen radios
> were capable of DX, I built one, using a 1H4G tube, and am having fun
> DXing with it. I finished it last night and soon had logged CKRM-620 Regina,
> KIRO-710 Seattle among many other stations. Best DX tonight so far was
> WGN-720
> Chicago, also had KNRS-570 Salt Lake City, KNBC-680 San Francisco among
> many other stations. Best daytime DX was CBK-540. Am having a lot of
> fun with this - with seven local 50 kW stations here in Calgary, was
> wondering if I would get
> much DX at all but with careful adjustment of the regeneration the
> selectvity
> is not too bad - was even able to log with good signals KBOI-670 next to
> local 50 kW CFFR-660.
>
> As 45 volt B batteries are just about a thing of the past, I am using four
> somewhat elderly 9 volt batteries in series that gives 32 volts. Total
> cuurent draw is only 0.9 mA (and 50 mA from the D cell for the filament)
> so the batteries should last a long time. Antenna is a 50 foot wire outside
> run from the house to the garage.
>
> 73,
>
> Deane McIntyre VE6BPO
> Calgary AB
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-- 
Leonard Hyde
Weed, CA
Realistic DX-440
6 foot shielded loop
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