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 MISC - For Sale Amp Tuning Pulser 
- Have a Larry Hofer Pecker for Icom radio. Asking $45. Shipped to lower 48 States.
Have MFJ SDR T/R Switch 1708 SDR. Asking $45 Shipped. SOLD
I accept PayPal, USPMO, and checks.
- Listing #1760100 - Submitted on 02/25/26 by Callsign W8BJ, Modified on 02/26/26 - IP: 254.sub-174-206-33.myvzw.com
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 MISC - SDR Guardian Antenna Sharing Controller
- I make these antenna sharing controllers because there is positively NOTHING on the market that even comes close. Period! Full manual at http://w1mm.com/sdrg/SDRG_Manual.pdf
YouTube video demo at https://youtu.be/i0pmxehTbG4
Specs:
Max pwr: 100W PEP
Isolation relay switching: Fully preemptive, bidirectional
Preempt delay adj: 25-250mS (50mS default)
PTT input polarity: - (default) or + (5-12v)
CW mode: Semi break-in
Semi break-in decay: 0.1-1.0 seconds
Isolation: >135db (140db typical. Yes, really)
LNA gain: 5db from 160-6m (SDR output only)
Fail-safe trigger voltage: ~250mV peak (-2dbm or 0.6mW)
Fail-safe clamp response time: -45db within ~35nS, -135db within 10mS.
$239 ea., free USPS priority S&H (US only). Outside US, S&H extra.
Cash App or Venmo preferred. Paypal if you twist my arm.
More pics at my QRZ page, W1MM.
7 units in stock for immediate sale, 15 more in the pipeline.
- Listing #1760141 - Submitted on 02/25/26 by Callsign W1MM - IP: 32-219-38-150.bng02.wtrb.ct.ip.frontiernet.net
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- RADIOHF - Flex 6300 SDR Transceiver
- Flex 6300 SDR Transceiver Excellent condition, upgraded to SmartSDR 4.1.3. Hand mic, power cord, ethernet cord—no ATU. Used as a remote unit; replaced w/8400 M. Radio works as it should; I had it on the air last night.
The SmartSDR v4.1.3 upgrade brings significant improvements on signal clarity, operational convenience, and advanced noise management according to Flex.
$1099, shipped to continental US. PayPal accepted; cash accepted for local pickup.
- Listing #1759917 - Submitted on 02/23/26 by Callsign K8MSH - IP: 99-113-232-93.lightspeed.bcvloh.sbcglobal.net
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- MISC - WTB: SDR Play
- I am looking to purchase a fully function SDR Play Prefer model 1A but will consider other models.
- Listing #1759583 - Submitted on 02/20/26 by Callsign K9CEG - IP: syn-075-128-224-143.res.spectrum.com
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- RADIOHF - HamGeek USDX 3 BAND QRP
- Like new HAMGEEK USDX SDR QRP all mode transceiver 15/20/40m 3-band HF transceiver with Bluetooth. Includes microphone and power cord.
$75
- Listing #1758624 - Submitted on 02/10/26 by Callsign NB4M, Modified on 02/15/26, Web Site: https://www.qrz.com/db/NB4M - IP: host-208-118-200-124.dtccom.net
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- MISC - DIY PROJECT boxes for RF-UHF-VHF uwave ?
- [** more pics on website link below]
> build your next homebrew radio projects into these boxes:
SDR, RF, outboard remote preamps, HF, UHF, VHF, microwave,
QEX pcb prototypes, osc, Tuna tin gear, etc
(12in X 7in X 1 1/4in)
> Small RF-tight (RF gaskets), machined metal modules/enclosures
4 small boxes with feedthroughs and SMA jacks already installed
& 4 hardline jumpers,
(panels can be cut into 4 indiv boxes using bandsaw or mill)
>
> boxes have small PC boards with many components
incl 3 Mini-Circuits mixers MCL SBL-1(2) MCL SBA-1(1).
>
#1 2.25" X 4.25" 2 SMA jacks each end, 2 feedthroughs, 2 grounding tabs
#2 2.25" X 4.25" 2 SMA, 2 feedthroughs, 2 grounds
#3 4 1/4" square, 4 SMA, 5 feedthroughs and 3 grounds
#4 2.25" X 4.25" 2 SMA, 3 feedthroughs, 1 ground.
>
$34 each panel incl one ea #1,#2,#3 & #4 plus ship USPS Ground
3.5 lbs ea
>
(6 sold) abt 18 still avail
** more pics see link below
>
73, John K3US/4
- Listing #1754778 - Submitted on 01/05/26 by Callsign K3US, Modified on 02/14/26, Web Site: https://macon.craigslist.org/ele/d/warner-robins-diy-electronic/7910316864.html - IP: 162-239-234-159.lightspeed.tukrga.sbcglobal.net
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- RADIOHF - CommRadio CTX-10 Xcvr w/Accessories
- CommRadio CTX-10 QRP Xcvr w/Accessories
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Excellent SDR transceiver, 1 - 10 watts out, includes box, printed manual, USB charging cable for internal batteries and a brand new Yaesu MH-31 hand mike. Internal batteries are very good, holds a charge no problem. I am currently selling some of my QRP radios because I just have too many and I need to finance some new projects. Email with questions.
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$600 plus $35 S/H/Insurance CONUS. Payment accepted via Personal Check, USPS Money Order, Cash upon local pickup, or PayPal Friends and Family - thanks
- Listing #1757365 - Submitted on 01/30/26 by Callsign W5CCP, Modified on 02/12/26 - IP: ip68-97-26-159.ok.ok.cox.net
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- RADIOHF - TRADE: Sealed Mac Mini & Yaesu FT-891
- Looking for a 100% trade of your Yaesu FT-891 sealed new with receipt for my sealed new Apple Mac Mini MGEM2LL/A:
1.4GHz Dual-Core Intel Core i5 (Turbo Boost up to 2.7GHz)
500GB SATA Drive 5400 RPM
4GB 1600MHz LPDDR3 SDRAM
If you want more from my side of the trade, it will only be more new goods, NO MONEY.
Preferably in San Diego, CA, so no shipping disasters.
Someone abused the email form to lie that it's "completely unsupported" - oh really, then why did Apple just push the ~9GB Security Update 2026-001 Catalina to my in-service Mac Mini (Late 2012)? This sealed new Mac Mini, because it's an even newer model, is upgradable to macOS 12/Monterey, and as Apple's still willing to push security updates over 13 years later to one, the other should still be supported too.
Then another person abused the email form to lie that "Catalina is an older non supported OS" even after reading that Apple supported the Catalina OS just a few days ago by updating it.
- Listing #1758407 - Submitted on 02/09/26 by Callsign N6ATF, Modified on 02/09/26 - IP: ip68-101-210-239.sd.sd.cox.net
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- MISC - TRADE: Your coax, My satellite SDR gear
- Looking for a 100% trade for equivalent value of under-store and/or manufacturer warranty UHF-terminated LMR-400. My package of the Blockstream/Bitcoin satellite receiver parts:
* not pictured ~32 inch oval DirecTV dish & back bracket (cleaned & then stored inside but needs slight paint touch-ups) with 3 mounting options: sled, J-mount mast, and 2"x4' mast pipe
* Sealed new Universal Single LNB bracket
* New in box Maverick MK1-PLL LNB 11.7-12.2 GHz, KU
* New GQ BS-55 25 ft quadshield weatherproof RG6
* Like-new SMA-F adapter SMA Male to F-Type Male plug (for plugging SDR into the power inserter without need for coax adapter)
* Sealed new DirecTV PI21R3-16 21 volt power inserter
* Like-new, tested ~2 hours RTL-SDR Blog V3 R820T2 RTL2832U 1PPM TCXO SMA Software Defined Radio (dated 4/2019, purchased direct)
* Sealed new 50 cm PRO Clear USB 2.0 Extension Cable A to A Female Lead 24AWG Ferrite
Face-to-face only in San Diego, CA due to all the dish parts.
- Listing #1758401 - Submitted on 02/09/26 by Callsign N6ATF - IP: ip68-101-210-239.sd.sd.cox.net
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- RADIOHF - Flex 1500 SDR transceiver - perfect cond
- 100% functional. Great introduction to software designed radio technology. SDR software runs on Win-7/8/10/11. Extremely quiet receiver makes QRP CW a real pleasure. $450 shipped CONUS.
- Listing #1758226 - Submitted on 02/07/26 by Callsign W1HKJ, Web Site: https://www.w1hkj.org - IP: 173-25-45-255.client.mchsi.com
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