B&W

Barker & Williamson (B&W) TVL 40 Coil for 40 Meters in Original Box

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MPN:: TVL
Condition:: Used
Shipping:: $8.00 (Fixed Shipping Cost)

$25.00

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Description

Description

Barker & Williamson (B&W) TVL 40 Coil for 40 Meters in Original Box

This coil is in very good condition

Barker & Williamson (B&W) TVL coils are vintage air-wound inductors designed for amateur radio transmitting applications, particularly in link-coupled tuners, amplifiers, or antenna matching networks. Introduced in the mid-20th century, these plug-in coils feature a primary winding with a variable (adjustable) link coil for optimized coupling and impedance matching. They are constructed with tinned copper wire embedded in ribbed plastic or ceramic forms for high Q (quality factor), mechanical stability, and efficient RF performance at higher power levels (typically rated for 100-500 watts depending on the setup). The TVL series was part of B&W's broader line of inductors, including variants like BVL (for lower bands), HDVL (heavy-duty), and JVL (junior/light-duty models).These specific coils cover the amateur bands mentioned:

10-meter coil (e.g., 10-TVL): Typically 28-29.7 MHz, short coil length (~3-4 inches), low inductance for higher frequencies.
15-meter coil (e.g., 15-TVL): 21-21.45 MHz, similar compact design.
20-meter coil (e.g., 20-TVL): 14-14.35 MHz, moderate inductance.
40-meter coil (e.g., 40-TVL): 7-7.3 MHz, longer coil with higher turns.
80-meter coil (e.g., 80-TVL): 3.5-4 MHz, highest inductance in the set, often with a plug-in base for easy swapping.