QTH.COM Ham Radio Classified Ads: COMPUTER - Swap amateur radio HF VHF equipment buy sell trade on line

FOR SALE: USR-N540 4-Port Serial Server: NEW-IN-BOX: USR-N540 4-Port Serial Device Server.
The USR-N540 is an industrial 4-port serial device server
that converts RS-232/RS-485/RS-422 serial devices to Ethernet
TCP/IP so sensors and controller can be monitored or
controlled over a network.
$140 shipped. Payment via VENMO or US Money Order.
73,
Scott; Listing #1764073 - Submitted on 04/04/26 by Callsign WA0TPN, Modified on 05/21/26 - IP: 57-89-181-166.mobile.uscc.net; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
FOR SALE: MXL 990 USB Condenser Mic: The MXL 990 USB is a large diaphragm condenser microphone
used for vocals, podcasting, and recording. This MXL 990 USB
Is new-in-box.
$85 includes shipping
Payment via VENMO or USPS Money Order.
73,
Scott; Listing #1764079 - Submitted on 04/04/26 by Callsign WA0TPN, Modified on 05/21/26 - IP: 57-89-181-166.mobile.uscc.net; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
FS:Dell WD22TB4 Docking station: Nice Dell docking stations. 2 x WD22TB4 and K20A. $100 each. Power supplies 2 x LA180PM180 180 watt $40 each and 2 x LA240PM160 240 watts $60 each. All plus shipping.; Listing #1768602 - Submitted on 05/20/26 by Callsign W1JCW - IP: 23-92-13-217.wirestar.net.wirestar.net; Click to Contact -- Send this Ad to a Friend
PCIe X4 Angle Adapter Card: Plugs into PCI X4 Slot to produce a different angle for the card
Bought for a Zimaboard but didn't use it, $16 shipped; Listing #1768555 - Submitted on 05/19/26 by Callsign KB0DN - IP: 73.229.247.158; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
Terramaster F2-424 2Bay NAS w/2 M2 Ports: In retail box like new, runs Terramaster OS, or any x86 based OS
like Windows, Linux, OpenMediaVault, TrueNAS, Unraid, Etc., $350 shipped
Intel N95 3.4 GHz Quad Core CPU
Intel UHD Graphics 16EU GPU
8GB DDR5-4800 (upgradable)
4GB USB Internal Drive with TerraOS bootloader
2 x NVMe X4 Slots
2 x 3.5" SATA III slots
2 x 2.5 GbE LAN ports
1 x USB-a Port (10Gbps)
1 x USB-c Port (10Gbps)
1 x HDMI Port; Listing #1768554 - Submitted on 05/19/26 by Callsign KB0DN - IP: 73.229.247.158; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
WD SN520 512GB NVMe X2 M.2 SSD: Excellent condition, $45 shipped
100% SSD rating
Passed WD diagnostics
Wiped; Listing #1767093 - Submitted on 05/05/26 by Callsign KB0DN, Modified on 05/16/26 - IP: 73.229.247.158; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
PCIe X4 NVMe SSD Adapter Card: Like new, $17 shipped
NVMe M.2 Adapter Card for PCI X4 Slot
With full and half size slot cover brackets; Listing #1767523 - Submitted on 05/09/26 by Callsign KB0DN, Modified on 05/16/26 - IP: 73.229.247.158; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
PCIe X4 Dual Port NVMe and SATA SSD Adap: Like new, $17 shipped
Dual port NVMe and SATA M.2 Adapter Card for PCI X4 Slot
With Full size slot cover bracket and SATA cable (Needed when using a SATA M.2 SSD); Listing #1767524 - Submitted on 05/09/26 by Callsign KB0DN, Modified on 05/16/26 - IP: 73.229.247.158; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
USB-c and a to 3.5mm Audio Adapters: New, $15 shipped
Adds audio out to devices without a 3.5mm port, such as PCs and Cell Phones
1 x USB-c to 3.5mm audio jack
1 x USB-a to 3.5mm audio jack; Listing #1767951 - Submitted on 05/13/26 by Callsign KB0DN, Modified on 05/16/26 - IP: 73.229.247.158; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
FOR SALE or TRADE: iMac G5 1.8 GHz 20 in: (M9250LL/A)
Replaced PSU with working used one from 100% positive-rated, 4.7K items eBay seller intellitec23. Successfully installed Lubuntu 16.04.5 without encryption or LVM, since Apple abandoned PPC OS support. I've spent more time & money than $100 restoring this as far as I can, overall. Has 160GB SATA HD, 4X "SuperDrive", 2x256MB RAM, basic black power cord, Apple-branded power cord, an original CRT iMac keyboard (model M2452, teal) that passed on keyboardtester.com - you clean it out. No AirPort card. Screen scratches pictured. Wired ethernet will need a Linux pro vs my noob skills to reactivate so it can download ham packages.
$100 cash or bitcoin or trade for under-store and/or manufacturer warranty HF station components (other than antenna or SWR meter, already have those), face-to-face only in San Diego, CA.; Listing #1767915 - Submitted on 05/12/26 by Callsign N6ATF - IP: ip68-101-210-239.sd.sd.cox.net; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend