Members may be interested to read or download digitised back numbers of Wireless World and Practical Wireless. Some articles remain useful even now after 30, or more years. See the Wireless World selection here:
http://www.americanradiohistory.com/Wireless_World_Magazine.htm.
Here is an extract from an index of interesting-looking items from Wireless World that I’m drawing up. If folks want to see more, just ask:

Year-Month and page number:
1986-08 page 43: A design for a pulse generator instrument
1986-06 page 39: A VHF pre-amp design
1986-04 page 21: An analogue Hilbert transform circuit for SSB
1986-03 page 22: Transistor based full wave detector circuit

1985-12 page 23: An article on digital filter theory
1985-10 page 27: How to make a logarithmic amplifier
1985-04 page 38: A loop antenna for HF
1985-02 page 51: Index to issues from Jan-Dec 1983.
1985-02 page 55: A UHF osc and mixer for a spectrum analyser

1984-01 page 57: HF signal generator

1983-08 page 58: Spectrum Analyser pt1

1982-10 page 59: Audio to LF signal generator
1982-10 page 67: Designing parabolic antennas
1982-09 page 32: Digital VFO stabilization technique
1982-06 page 43: Digital filter design tutorial
1982-06 page 62: Freq synthesiser design tutorial
1982-05 page 51: Wide band FM demodulator or freq meter
1982-05 page 52: Digital filter design tutorial
1982-02 page 38: RC sinusoidal oscillator design tutorial

The same site also offers digitised back issues of Practical Wireless. Again, these look like a mine of information:
http://www.americanradiohistory.com/Practical_Wireless_Magazine.htm

Best regards,
Steven.
de M0SVR