National Company SW-4

Desktop Shortwave receiver

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Oldest known amateur radio model. Coverage ranges from 15.5 to 115 meters, with optional coils extending the range to 570 meters. Was sold as kit for USD 45,90 with optional metal cabinet for USD 5,25 or pre-build for USD 55.00.

Frequency range

RX-range
15,5-26,6 / 23,5-41 / 37,5-65 / 64-115 meter
110-175 / 170-300 / 290 - 570 meter optional
TX-range
-
HAM bands
?
Stability
?
Tuning steps
?
Filters
?

Receiver

Modulations
AM  
Sensitivity
?
Selectivity
?
Receiver system
TRF with regeneration
IF-frequencies
?
Image rejection
?
Audio output
?

Transmitter

Modulations
-
RF-Output
?

Connections

Antenna
-
Impedance
50Ω

Electrical

Power requirements
6 + 45 + 135 + 180 V
Current drain RX
?
TX
-

Physical

Dimensions (w×h×d)
?
Weight
?
Form factor
Base Station
Manufactured
Between 1929 and 1935 in USA
MPN
NATIONAL-COMPANY-SW-000004

Other features

Memories
?
Usage
Amateur / Ham radio operators
Features + options
?
Accessories
External PSU: National 3580B

Manuals, diagrams and brochures

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New and second-hand prices

Estimating the value of a rig can be challenging. We collect prices paid by real hams over the years to help you estimate the value of a used National Company SW-4. Just bought or sold this model? Let us know what you traded it for and help other ham operators!

Based on historic data, today's second-hand price of the National Company SW-4 is around:

  • USD 0.00
Year Historic price Condition Submitted by
1929 USD 55.00 New / Mint RigReference

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