These things sure don’t like high SWR, as smoke came out of mine once!
I finally realised I was transmitting on 28MHz into my 50MHz yagi… Ooops!!!
Anyway… R23 crapped itself… big time. Went open circuit.
Refer to PBA overlay … Read more...
The FT-50R will drain it’s battery rather quickly, even if the transceiver is turned “off”.
This mod will reduce the “off” current drain of the transceiver.
Note: Actual layout of PBA may vary depending on revision.
Abbreviated procedure;
We take a look at sweeping an M2 23CM35 yagi for 1296 MHz using a Windfreak SynthNV USB powered and programmed RF Signal Generator / RF Power Detector from Windfreak Technologies LLC.
I was looking into using a single VK3XDK PLL Synthesizer for both my 2.4GHz and 3.4GHz transverter systems.
ie; sharing the one PLL for both bands, with appropriate switching.
To expand on the general concept…
The trick is to use … Read more...
One thing that became apparent when using a single XDK PLL board in a dual-band 2.4/3.4 GHz transverter system, is that the PLL’s limitation on producing even MHz only, necessitates using different IFs.
For 2403, (1970 LO), a 433 MHz … Read more...
This describes how to modify a Yaesu FT-817, so that the +12V appearing on the accessory connector switches on and off with the radio.
Normally, the +12V appears on the ACC connector when it has internal batteries fitted or DC … Read more...
Kuhne provide a PLL Lock status LED on the PLL board of their G3 transverter modules.
This LED is inside the module, which is great when the lids are off on the shack bench, but of limited value when out … Read more...
NEVER use VOX operation when using RF Power Amplifiers.
It should be obvious why.
The transmitter, and the PA will switch on after audio modulation is detected.
You will certainly have a hot-switch condition with the PA T/R relay when using … Read more...
When is a transfer relay not a transfer relay?
Normally, a transfer relay can be considered as a “double change over” device, but not all transfer relays may be manufactured to behave like this… and this can be used to … Read more...
I was caught by surprise out in the field the other day, when my new Kuhne MKU 10 G3 432 appeared to not work.
But it worked fine on the shack bench.
Unlike my Kuhne MKU 57 G3 432, it … Read more...
Expressions of interest in obtaining a ThunderBolt Display will be closing soon.
This third production run will be the last.
Please contact me, if you would like to obtain a ThunderBolt Display, and indicate what type of LCD option … Read more...
My Down East Microwave Inc 3W 10GHz amp kit arrived in the mail recently.
It was ordered on 14/4/11 and arrived 20 days later on 4/5/11.
There aren’t too many pictures on DEM’s website, but here is a quick look … Read more...
Here’s an interesting rainy day project for microwave enthusiasts to experiment with.
And as luck would have it, it poured down today!
From Kent Electronics it’s a PCB based 2 -11 GHz log periodic antenna.
Kent Electronics describe this as;… Read more...
This 5.7 GHz Power Amplifier originated from the Wellington VHF Group some years ago, and the information below is a compilation of information posted on the Archived VK Logger Discussion Forum topic.
Here’s a rundown of my Trimble Thunderbolt GPSDO project.
It provides an accurate 10MHz reference for the transverter Local Oscillator PLLs.
The existing Thunderbolt mounting holes will be utilized, and mounted in a vertical orientation, inside the 3RU 2.4/3.4GHz transverter … Read more...
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