Good news from Hans! 73 Chris
5 Likes
Today I was able to successfully activate the summit DM/NS-122 on 630m and now have a complete with DM/NS-121 on the wave.
73 Chris
16 Likes
Good luck Chris, fingers wires and bridges all crossed for you both…
1 Like
…hi Paul, we in VK can use 630m and 2200m. Food for thought!
Geoff vk3sq
2 Likes
Tnx Paul, my RST 90km away was 539 and a for him a big surprise, when Chris DF5QG later told me that I had only 10W out.
73 Chris
3 Likes
Here are two clips for adapting 630m antennas to the TRX. In German only, please use AI subtitles for translation.
73 Chris
4 Likes
Is it that the rotary switch on the input shunt inducror switches from straight thru (pos 1) to max (pos 2), whereas the two rotary switches on the series inductor switch from straight thru (1) to min (2)? I could be dreaming, it’s late!
1 Like
The circuit for the impedance transformer is indeed a bit odd. I try to keep the coil impedance for the transmitter input as high as possible. On switch position 1 it’s direct connected to load coil above. That’s for a antenna and ground with 50ohms. On 12 the 50ohms are transformed to 512 Ohm.for a bad cointerpoise situation.
I will provisionally corrected the error in the schematic in a minute.
73 Chris
2 Likes
Lars, SA4BLM, sent me the link to the clip. It’s interesting to hear that SSB is also being used on 630m in the States. The band plan in Germany only allows for CW and digital.
73 Chris
4 Likes
Today I tried a 630m activation with minimal effort.
I used my usual 20m long EFHW 10m inverted V antenna. As a counterweight, I placed 40m of wire in a semicircle under the antenna.
Amazingly, about 600uH was sufficient for tuning, and the repeatability was 559 at a distance of 100km.
Therefore, I revised and simplified my above suggestion for an antenna tuner.
The rotary switch for coarse tuning still has 12 positions, but for fine tuning, there are now only 6.
A video explaining the circuit diagram will follow soon.
73 Chris
6 Likes
Please use AI subtitles for translation.
73 Chris
5 Likes