RadioShack
Vintage 1994 Radio Shack DSP 40 Noise Reduction System 21-543 CB Ham Radio
$29.95+ $7.99 shipping · total at checkout
- SizeOS
- ConditionGood
Size and condition above come from the listing. The description below is the seller’s own text.
Overview:Up for sale is a vintage ca. 1994 RadioShack DSP 40 Digital Signal Processor Noise Reduction System, catalog number 21-543. This outboard audio processor connects to the speaker or headphone output of shortwave, amateur ham, or CB radio receivers to filter out heterodynes, static tones, and background interference using digital signal processing. This listing compiles information across multiple detailed views to showcase all angles of the processor, highlighting the rear input/output port console.Specifications:Brand: RadioShackModel: DSP 40 (Cat. No. 21-543)Type: Outboard Digital Signal Processor / Audio Filter SystemProduction Year: 1994 (Decoded from QC stamp code 1A4)Front Interface Elements: Standard headphone output jack, Bandwidth rotary selector switch (Narrow / Med / Wide), Filter multi-position switch (NR / SSB / CW), main Volume control dial with integrated Off setting, and a tactile Power switch button with dual LED indicator windowsConnection Ports: Rear panel houses an external speaker jack (EXT. SP.), an Audio Input jack, and a DC 12V external power input receptacle (center-positive polarity)Origin: Custom manufactured in Taiwan R.O.C. for Radio Shack, a division of Tandy Corp.Serial Number: 105657Excluded Items: This listing is for the main unit only. No 12V DC power cables, auxiliary audio cords, or instructions are included.Condition:Cosmetic Condition: The outer plastic casing is structurally sound and displays normal surface handling marks, light scuffs, scattered superficial hairline scratches along the rear housing panel, and minor dust typical for a vintage workshop component. The factory printed front console labels and molded rear technical port identifiers remain fully intact and legible.Operational State: The unit is electronically untested. The physical control dials and selector keys turn mechanically, and the rear input ports are physically clear of internal debris. This vintage item is being sold as-is.--These items are part of an estate from a collector and carpenter by trade (descended from other crafts-persons, mostly in Connecticut). Payment required within 48 hours of auction's end. All items from a smoke-free environment. Please check out the other items from this collection!
Buyer Protection — full refund if it is not as described
Buy nowAdd to your bag
One quick step, and it works across every Closo shop.
We emailed it to .
Shipping$7.99 flat
$7.99 flat.
ReturnsAll sales final.
All sales final. Items not as described are always covered — see Buyer Protection below.
MeasurementsNot listed
This listing does not carry measurements. Ask for measurements — it goes straight to Brian Blais.
Buyer ProtectionNot as described — full refund
Full refund if your item isn’t as described, arrives damaged, or never arrives — report within 3 days of delivery. The money is held until then.
Message Brian Blais
Vintage 1994 Radio Shack DSP 40 Noise Reduction System 21-543 CB Ham Radio
$29.95
Message Brian Blais’s
One quick step, and it works across every Closo shop.
We emailed it to .
Sending as
Sign in to send a message. It takes one code by email — no password.
Your question goes to Brian Blais here in Closo, and their answer appears in your account. Neither of you sees the other's email address.
Other · RadioShack
I’ll email you when gear like this lands.
Notify me
- 1 Email
- 2 Preferences
- 3 Done
Never miss the next find
Other · RadioShack
I’ll email you when gear like this lands.
Takes 20 seconds · one email when it matches
Follow Brian Blais’s
One quick step, and it works across every Closo shop.
We emailed it to .
You’re on the list
Sending to
One email when it matches. Unsubscribe anytime, one tap.
Set what to look for 2 quick steps · optional ›
Set what to look for
Alerts fire only for what you pick here.
Pick anything and I’ll only email you when it matches.
You’re already subscribed — this only narrows what I send.
