This early design really illustrates the talent of Drake¡¯s engineers and their ability to think differently.?
The calibrator was powered by using the ¡°other¡± 180¡ã rotation of the antenna trimmer. There¡¯s a cam on the shaft which presses on a switch to turn on the calibrator.?
As you mentioned, WWV is marked on the dial and WWV aligns with 10 MHz. Drake didn¡¯t know it at the time, but what is there now is a 6 ham band receiver, as these later 1-A¡¯s cover 30m just fine!
There is no complete schematic of the early 1-A that I have ever found. There is a partial schematic that looks to have been created by OrCad years ago. There are definite differences between the older and newer sets, including tube type changes, calibrator, 10MHz coverage and the translucence of the dial.?
Steve Wedge, W1ES
Time flies like an arrow. Fruit flies like a banana.
On Tue, May 27, 2025 at 14:36, Edward J. Smith via groups.io <
EDWARDJAMESSMITH52@...> wrote:
I have a 1A, Serial #331, an early one, and another later one with WWV.?
I didn't realize that the original version did not have a crystal calibrator (I knew it didnt have WWV) until I opened them both up for recapping.?
The "newer" one also has a couple of sub boards, the original does not, though the components seem to be there.?
I don't have and cannot find the manual or a schematic? for the older unit, just for the newer one from BAMA.?
My question is does anyone know what the WWV mod, (which could be performed by Drake) consisted of? I assume it was not a difficult mod, and that the bandswitch has another contact for WWV. I have replaced the tuning dial with another I had, which has the WWV marking. Was thinking of adding the calibrator and WWV mod, but since no schematic of original old version its not obvious what was added. I have a third unit Which works but missing knobs and face place, its a shame to use it as spare parts.
?
Thanks,
Ed
W1FU
?
