Furthermore there is a small 470 Ohm resistor in the kit, too. This is to avoid RF feedback (besides the other measures taken on the PCB itself). There’s a small 1 nF SMD capacitor in the kit that needs to be soldered directly onto the electret capsule included in the kit. They will be glad to help you.Ī few additional explainations besides the Quick Assembly Guide. Alternatively contact them by mail or telephone to place your order. Ordering from outside the EU is easily done through Paypal, see their instructions on their product website. Step-by-step instructions are available, either in English ( Quick Assembly Guide) or German ( Baumappe).
#FLEXRADIO VOICE KEYER RUMLOGNG FULL#
In both cases all SMD components are pre-soldered to the PCB so only a hand full of through-hole components need to be soldered by the customer. Kit BX-184M includes an MH-31 besides the PCB for those not owning one yet, i.e. It is available from their webshop in two variants: BX-184 is the replacement PCB for those who already own an MH-31 microphone. You can find a German description in the FUNKAMATEUR magazine, issue 2/11, where I introduced the MH-31 voice keyer to their German speaking readers.įUNKAMATEUR decided afterwards to produce a commercial kit. The result is a solution that can be used with potentially every available transceiver on the market today. Due to the additionally needed components I had to eliminate the sliding switch, too, wiring the FST button directly to the microcontroller. Kenwood, Icom, Elecraft who provide 8 V there instead of 5 V like Yaesu does (it works with voltages up to 16 V). (that’s what you see next to the RJ-45 socket on the picture above) so you can use the original mic cord without modifications as well as a small voltage regulator to use it with transceivers with higher voltages on the mic socket, i.e. So I redesigned it again: It got a small jumper field to configure which wires of the microphone cord are used for PTT, ground, audio, up/down, etc. And even then you could only use it on transceivers with 5 V available on their microphone sockets. If you wanted to use it with other transceivers you would need to rewire the microphone cord or build adapters. While this worked right away I found the design to be to unflexible. The slider switch on the microphone’s back side was used to switch the mic’s FST button between transceiver and the PIC microcontroller. The prototype was designed to be an exact replacement so you could simply put it into the microphone, plug in the mic cord and attach it to a Yaesu transceiver and be done. The picture on the right shows the comparison between the original MH-31 PCB left and the first prototype PCB right while above left you can see the final PCB. Basically it is nothing else than the SBVK but with a few design changes concerning how the ISD 1760 voice chip is controlled (using the SPI interface) and how audio is transferred to the transceiver. So I could develop a replacement PCB containing all needed components for a voice keyer. And no additional weight as the used components weigh less than the original innards of the used microphone.Ĭhecking standard transceiver microphones available today I quickly discovered that the Yaesu MH-31 hand mic would be an ideal candidate for this project as it’s few components are soldered on a PCB that can be taken out. These where the reasons why I decided to develop something entirely new and not available on the market yet – a voice keyer completely integrated into a standard fist microphone! So no additional box as you need the microphone anyway. Even for home use some might prefer not to have an additional external box that needs to be wired and takes up precious space on the operating desk.
But what to use when go hiking or being mobile? Due to weight (hiking) or security (mobile) reasons an external box is probably not the right solution.
#FLEXRADIO VOICE KEYER RUMLOGNG PORTABLE#
Especially the FA station manager with it’s 4 voice memories, built-in CW keyer and sequencer is a versatile tool but rather designed to be a fixed or table portable station accessory. The SBVK and FA-SM solutions featured on this website are good solutions to full-fill that task.
Therefor many seek for external solutions. There are not many transceivers having such a nice feature built-in. Polish Youtube video presentation by SQ6NEJ. Short Spanish video by EC4TR.Īmateurs wanting to save their voice during CQ calls know the advantages of voice keyers, also called CQ parrots.
Video review in Slovenian by S53K.ĭG2IAQ video test with FT-817. Now available stateside, too – click here!īuild review by G1YBB.
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