Ten-Tec Model 235 CW Crystal Filter for the 315 Receiver NEW in Box

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MPN:

235

Condition:

New

Shipping:

$8.00 (Fixed Shipping Cost)

Description

Description

Ten-Tec Model 235 CW Crystal Filter for the 315 Receiver NEW in Box

Description

For Model 315 Receiver.

Specifications

Audio type
Bandwidth: 300 Hz @ 6 dB
Shape Factor: 4.2 @ 6 / 30 dB points
Center Frequency: 800 Hz.
Two position skirt attenuation: position 1 is steep skirts, position 2 attenuates skirts approximately 15 dB.
Integral active amplifier eliminates insertion loss.
Plug-in construction

Ten-Tec Model 235 CW Filter is a vintage optional CW (continuous wave/Morse code) filter accessory from the early 1970s (circa 1972), specifically designed for the Ten-Tec Model 315 solid-state general coverage receiver (80–10 meters, PTO-tuned, with built-in speaker, calibrator, and 9 MHz crystal filter in the IF chain). The Model 315 was a compact tabletop receiver introduced around 1972, priced at $229 new, and popular among budget-conscious hams for its clean performance and simplicity.The 235 is an audio-level CW filter (likely active RC/op-amp based, similar to early Ten-Tec audio filters like the 245 series), providing peaked narrow bandpass response centered around typical CW offsets (~750 Hz) to improve selectivity against QRM in crowded bands. It installs internally (plug-in or wired to the CW filter switch positions), enhancing the receiver's CW capabilities beyond the stock 9 MHz crystal filter.Key Details and Specifications

Type: Audio CW filter (not crystal ladder/IF; post-detection for simplicity and cost).
Bandwidth/Peak: Narrow peaked response (exact specs undocumented publicly but typical for era: ~300–500 Hz effective for CW tones).
Installation: Internal accessory board/module; connects via existing provisions in the Model 315 (simple drop-in per period instructions).
Era: Early 1970s, part of Ten-Tec's basic receiver accessory line.
Build: Small circuit board (likely with op-amps, resistors, capacitors); affordable add-on for the budget Model 315.

Compatible Radios

Primarily/only for Model 315 receiver (solid-state 80–10m general coverage RX, PTO, 9 MHz IF crystal filter standard).
No documented compatibility with other Ten-Tec models (e.g., Triton series used the 245 audio filter board; later rigs like Argosy/Omni used crystal ladder IF filters like 217–220).

Confirm exact installation with the Model 315 manual (available via Ten-Tec archives or enthusiast sites like qsl.net/tentec).