Note
73, Sep 1977, inside front cover.
Ham Radio, Nov 1977, p. 115.
QST, Dec 1977, p. 116.
QST, Feb 1978, p. 148.
QST, Jan 1980, p. 187
QST, Feb 1980, p. 148. (close out)
The KLM 661 appeared in November 1977. The National version came lster.
Features
– Covers 50-54MHz. (Crystals are supplied for 50-52MHz).
– All modes: SSB with USB and LSB, CW, NBFM, AM.
– Built-in VFO covers 50-54MHz in 500 kHz increments.
– Four, crystal-controlled channels.
– Built-in low-pass harmonic filter.
– 10W min. power output (2.5W AM).
– Built-in power supply for 115 VAC and 13.8VDC.
– Clarifier.
– Noise blanker.
– Squelch.
– Triple conversion receiver with better than 0.25µV sensitivity.
– Built-in speaker. Provision for external speaker.
– 100 kHz crystal calibrator and VOX options (soon available).
– "Outstanding" AGC and sensitivity on receive.
