ISSUE 1, 29 AND 40MHz FREQUENCY KEYBOARD.
The Silvertone Issue 1 29/40MHz keyboard has been in continuous production since the introduction of the 29MHz frequency band in the mid 1970's.
Sadly, the 29MHz band has fallen out of favour for various reasons and today it is virtually unused on flying fields in Australia. This is a pity as the reasons given for not using the band are completely spurious. The main argument revolves around the frequencies being used for cars which is to some extent true but modern radios are mostly FM and the capture effect of the FM receiver will virtually guarantee that a low power car transmitter will not get through a modern receiver. Also the cars have never used the "Odd" channels and a similar system of "Odds" and "Evens" as legislated on the 36MHz band could be run on 29MHz band to enhance safety.
All of the Silvertone Mark 22 test flying was done on 29MHz, both AM and FM and all of the Silvertone test team fly 29MHz exclusively even today. All of this testing was done on the standard "Even" channels with absolutely no hint of interference.
So come join the laid back few on the 29MHz band and enjoy the luxury of no crowding or waiting for frequencies and absolutely no worries about intermodulation and all of the fun things that concern 36MHz fliers.
Get your club back into relaxation mode!
29MHz SECTION OF THE BOARD SHOWING THE ENORMOUS IMPROVEMENT IN RECEIVER BANDWIDTH SINCE 1970. 40kHz KEY ON LEFT, 20kHz KEY MIDDLE AND 10kHz KEY ON RIGHT.
40MHz SECTION OF THE BOARD.
The 29MHz keyboard uses the original Imperial grid of 0.1" = 1kHz and is therefore subject to the MAAA ruling which states only 2" keys may used. The range of keys shown in the photograph above being purely for interest sake to demonstrate the enormous strides made in receiver design since the Silvertone keyboards were introduced in 1969. Imagine fronting up with a 4" key today.
Frequency interlock may still be used with this board and the photos below show a 2" 29MHz key fitted with the Interlock plug and then plugged into a Mark 22-A single stick transmitter.
2" Key fitted with an Interlock plug. This plug fits into the charge socket and removes power from the transmitter even if the switch is ON.
Silvertone Mark 22-A single stick transmitter with the frequency key plugged into the charge socket, which is located on the left-hand side of the TX.
INSTRUCTIONS FOR THE USE OF THE SILVERTONE 29/40MHz KEYBOARD
Silvertone Mark 22-A two-stick transmitter with the key in the charge socket.
29MHz/40MHz Keyboard AU$199.00
2" Blue Key AU$2.50
(This board is too long for Australia Post and can only be sent by other forms of transport. Quantity discount available on keys.)
FLYING FIELD SAFETY.
WORTH STRIVING FOR!