amateur 73radio

Magazine Overview

Title: amateur 73radio
Issue: #120
Date: October 1970
Price: One Dollar

This issue of *amateur 73radio* is presented as a "General Class Study Guide" with a focus on "IC Projects A Bunch!". The cover prominently features a detailed image of an integrated circuit, highlighting the theme of modern electronics.

IC Projects

The magazine offers a comprehensive study guide for general class amateur radio operators, with a significant emphasis on Integrated Circuits (ICs). Featured projects include:

• Function Generator
• Transmitters
• Receivers
• Regulated Power Supply
• Band Edge Marker
• Phase Locked Loops
• How to Use ICs
• And more

This section aims to equip readers with practical knowledge and project ideas utilizing IC technology, which was rapidly advancing in 1970.

Surplus Electronics and Components

Two advertisers, TOWER COMMUNICATIONS and JEFF-TRONICS, offer a wide array of surplus electronic components and equipment:

TOWER COMMUNICATIONS (Racine, WI):

• RG 196 AU Teflon Coaxial Cable: 50 ohm, 0.080" diameter, available in various colors, priced at 5¢ per foot or $3.00 per 100 ft.
• 455 Khz Ceramic Filters (BF-455-A): For improving selectivity in radio sets, priced at 10 for $1.00 or 25 for $2.00.
• Toroid Power Transformers: Designed for hybrid FM mobile units, featuring multiple secondary windings for different voltages (e.g., 500V DC, -65V DC, 1.2V AC filament), priced at $2.95 each or 2 for $5.00.
• Power Transformers (P-7, P-9, P-10): Various configurations for different voltage and current outputs, with prices ranging from $2.75 to $4.50.
• Output Transformers (OT-1, OT-2, OT-3): For transistor applications, with different impedance ratings and power handling capabilities.

JEFF-TRONICS (Cleveland, OH):

• Surplus Bargains:
• 16 volts @ 15 amp. transformer ($4.00)
• Power transformer (275V no ct. @ 125 mA, 12V @ 2 amps) ($2.00)
• Johnson Miniature Variables: A selection of variable capacitors with different capacitance ranges (pF) and types (butterfly, differential), priced from 50¢ to 80¢.
• 18,000 µF 25V dc Sprague "Power-lytic" Capacitor: ($1.00)
• Humidistats (Honeywell #4681002-1): Humidity controllers ($0.45 each, 5 for $2, 100 for $30).
• BC 348 Receiver: Converted to 115V, excellent used condition ($75.00).
• BC 221 Frequency Meter: With calibration book and instruction book, excellent used condition ($75.00).

Both advertisers request sufficient shipping charges and offer catalogs for 25¢ (free with order).

International Amateur Radio in Romania (YO Land)

The magazine includes a section discussing amateur radio in Romania (YO land). It highlights the ease of obtaining awards and the high QSL rate (almost 100%), with a typical turnaround time of 3-4 months.

It is noted that Romanian amateurs cannot subscribe to western radio publications and greatly appreciate receiving old copies of magazines like *73*, *QST*, and *CQ*. The article emphasizes the friendliness of Romanian inhabitants and the hospitality extended to visiting foreign amateurs.

Several visiting amateurs are mentioned by name and call sign, including:

• Franco, IIFO (Milan, Italy)
• Zbyszko, SP5ZK (Warsaw, Poland)
• Janos, Ha5AM (Budapest, Hungary)
• Ludwig, DM2CHM (Leipzig, Germany)
• Jim, W8FXP (Jamestown, Ohio)
• George, K8NEY (Albion, Michigan)
• Lee, W6MNN (Gridley, California)

The section concludes with a quote from YO2KAC, encouraging readers to learn about other countries through amateur radio.

Recurring Themes and Editorial Stance

The editorial stance of *amateur 73radio* in this issue is clearly focused on practical application and accessibility for amateur radio enthusiasts. The emphasis on "IC Projects" and the "General Class Study Guide" suggests a commitment to educating and empowering readers with the latest technological developments, particularly in the realm of integrated circuits. The inclusion of extensive surplus component listings from advertisers reinforces a practical, cost-conscious approach, making advanced electronics accessible to a wider audience. Furthermore, the international perspective, highlighting amateur radio in Romania, promotes a sense of global community and cultural exchange within the hobby. The overall tone is informative, encouraging, and community-oriented, aiming to foster learning and connection among amateur radio operators.