W6CAW FlexRadio Page

Flex Links

Well, after looking at them every day for a year I have finally ordered a Flex 6400.
I know none of you have purchased a radio because you did not need it
but you wanted it?

New Flex 6400 tucked under the bench. It's a network appliance.

For some reason Flex decided to abandon the Yaesu "standard" microphone jacks and replaced it with an 1/8" stereo mini plug. They said it was for cost savings but my 3000 had a pick in place RJ45 jack that had to be almost as cheep as 1/8". Anyway......

I built a Y on one end of a shielded CAT6 cable to connect to the 1/8" for microphone and an RCA plug for PTT. The other end is plugged into my switch box. Since I recently purchased a
Yaesu FT-991A and have a microphone setup using a Yaesu MD-100 dynamic microphone, I found a 2 position A/B switch box on Ebay for $6.98 and FREE shipping. Add 2ea, 2 foot shielded CAT-5 patch cords from SF Cable and you have a great A/B microphone switch.


Flex has a great Transverter output. I am using the 2 Meter product from Ukraine. Unfortunately till the war is over he cannot ship any product. However a Google search will find lots of other vendors.

My Flex 1500

2023 Purchased a 1500 from a local Ham. I love the PowerSDR software and the features the current Flex software
is missing. With 5 watts to my Elecraft KPA500 amplifier I get a 100 watt radio.

My previous Flex 3000

Well, September 2023 found another 3000. Wow. The KE9NS software does a better
job of noise reduction than my 6400. Enjoying a 3000, again.

Flex Links 6000 Series

FlexRadio Systems Website
FlexRadio Systems hints forum.

FlexRadio Community Forum
Flex users and FlexRadio employees hints, problems, and fixes.

WoodBoxRadio S Meter

Freeware. Link downloads the .exe file.
Setup a FlexRadio CAT port for the meter to attach to.

Earlier WoodBox Flexmeter V1.2 download

Smart SDR Utilities

Lots of utilities for Flex SDR Radios

Remote Control

Many Flex users have extensive remote control systems for their radio, antennas and rotors. I just wanted something to turn on/off and re-boot the radio when I was operating remote. The Flex Community have come up with the solution below. It's cheep and works well. If you already have other remote Internet Of Things ( IOT ) plugs in your house you could use them with the relay module. Connect a jumper with bare wires on the NO and Common on the relay module. Put an RCA plug on the other and connect that to the Remote RCA connector. Use the their app to turn your radio on/off remotely.

Kasa Smart WiFi Plug ( on Amazon ) Mini by TP-Link - Reliable WiFi Connection, No Hub Required, Works with Alexa Echo & Google Assistant (HS105)

Relay Module
Universal control voltage 3-60VDC or 12-120VAC connects to Arduino, Raspberry Pi, PIC or other micro. Or connect directly to a 12V to 48VDC or even 120VAC circuit.
Available on
Amazon when they have them in stock.

Flex Links 1500, 3000, 5000 Series

PowerSDR kE9NS
FlexRadio no longer upgrades the PowerSDR software but, KE9NS not only keeps it current but is continually adding improvements and new features to PowerSDR.
Click here to download the latest KE9NS PowerSDR features.
Supports the Flex 1500, 3000, and the 5000.

2010 PowewrSDR V2.x Manual. (Download .pdf file)

W6OP Flex 3000/5000 basic and advanced setups.

*How to Configure the FLEX-3000/5000 for use with WINMOR.

*Above How to saved in MS Word format for easier read.

Setting Transmit Audio Gain Distribution in PowerSDR - W1AEX

Another Power SDR Transmit Audio Settings

One of the great things about Software Defined Radio is the ability to make "virtual" ports. Most of the above links recommend the Com0Com virtual serial port software and the Virtual Audio Cable program to create audio ports. VAC worked great for me ( Probably because it is not free? ) but Com0Com was a complete bust.

Thanks to Google I found VSPM ( Virtual Serial Port Monitor ) by K5FR. Worked great for me for HRD and Winlink.

RemAud. Remote control audio over VoIP
A Voice over IP (VoIP) application primarily designed for two-way amateur radio remote control over the Internet I haven't tried this yet but gets good reviews.

Troy Radio Service
Services all the older Flex Radios.

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Updated 9/2023