 The 7MHz CW transceiver made with MC3362P. I
made a 7MHz CW transceiver by using the IC for the narrow band FM double
super receiving circuit, MC3362P. I intended to make a transceiver for
10MHz band in the beginning. But, I was worried by the neighboring
spurious signal which wasn't expected, and I changed the plan. I changed
frequency to 7MHz band, and continued the production, and completed this
transceiver. The CW transceiver made by MC3362P was introduced to the QST
journal of December, '90 and January, '91 as well. (The article of the
translation of selected passages appeared in August, 91 issue of the JA-CQ
journal as well.) Because 2 set of double balanced mixers and local
oscilators are built in this IC, it is suitable for the single super
heterodyne receiver of SSB/CW. I made the whole circuit scale compact by
using the 1st mixer of the receiving circuit as the mixer for the
transmission as well. I am only using 2 transistors of the transmitting
output stage, 1 FET of the reception AGC, NJM386(second source of LM386)
and 4 transistors such as the transmitting-receiving switch, except for
MC3362P. But, though it is very much disappointed, it seems to finish the
production of MC3362P by the end in 1998. (The Motrola company recommends
MC13135 as the substitut.) |
 I included this transceiver into the case
of 'P-7' which was kit of the Mizuho company. As for being reflected by
the photograph of the upper front panel, a slide switch under that is a
power switch with a stereophonic headphones jack, a key jack, a VFO knob,
RF gain, AF gain from the left. It is the power supply connector of DC6 -
9V and a M-type antenna connector that it is reflected by the photograph
of the rear panel. |