Outspan Five

Radio Record, Volume V, Issue 18, 13 November 1931, Page 12

Outspan Five

(To the Hditor.) HAVE the Outspan working successfully, but I found it necessary to alter the eoils. With 75.80.75 wound on 2FC was my limit, so wound 90

turns on each, with 33 on primaries, and now can get 7ZL. I am using .00085 condensers and .00015 differential condenser, using 45 turns on tickler which. is not quite enough, as 2FC is not up to maximum strength with the moving plates full in. The following three tips may be useful to constructors :- (1) In winding the secondary and tickler coils, wind on more turns than necessary and finish of coils by bringing out the ends to solderlugs on top of the formers. This simplifies removing turns if necessary. (2) In balancing up (see Q. and A’s. for 16th October) break the lead fron: the .001 condenser to the top of the primary of detector coil and join it temporarily to the top of primary of the second radio coil, and then balance this coil with the detector and do the first coil last. This saves removing the detector coil to take the turns off the bottom. (8) I found extra insulation on th grid leads to be an advantage, ¥ I used glazite wire. To do this, obtain some hicycle valve tubing and slip over. To make it slip easily suck through some french chalk after cutting it to required lengthMoi Whare (Feilding).