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DK2RZ Germany flag Germany

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50 YEARS  OF  DK 2 RZ                                                                                                                                                                       I received my class-A radio license in 1967 and since without major breaks I'm an active operator on both, CW and phone.

DXM-Mobile Antenna

Here you can see the ORIGINAL DXM-Antennas, the most shortest, smallest but very rugged HF mobile antennas worldwide which I first introduced to the community in 2004 after many years of research, design work and testing.

My idea was to design highly efficient HF monoband mobile antennas of professional quality at overall dimensions as small as possible by also going to the extreme physical limits.

In fact these extremely short mobile antennas turned out to perform excellent also on long range DX where they can fully compete.

The DXM's are low profile antennas of light weight and they dont have no whip / no rod except the 80m model which only has a very short tuning section. The result is very stable signals and extremely low signal fading (low QSB). Also they are not much noticeable in the shape of a car or a building. All models can handle 120W SSB.

I now have a complete range of models from 3.5 to 50MHz with dimensions of total 0.1m, 0.2m, 0.25m, 0.3m, 0.5m0.9m

For example 0.9m on 3.5MHz or 0.3 / 0.5 / 0.9m on 7MHz or 0.25 / 0.5 / 0.9m on 14MHz and all ham bands above up to 50MHz.

 

Some of my mobile antennas

            ! No guy wiring !             ! Keine Abspannung erforderlich !

 

Rescently designed antenna for 40m. A DXM-30, only 1 foot (30cm) long, handling 120W SSB

 

My new designed 160m mobile antenna. A DXM-150, 5 foot (1.5m) long, handling 120W SSB

All DXM-90 models from 40m up now also as DXM-90 H, capable of 300W SSB

Last design made is for 60m, a DXM-90  ( 2016, Dec 20 )

 

 

Although in 2012 we had some of the poorest band conditions ever, I was delighted 
to work over 100 DXCC countries during the 2012 calendar year. 
This was done entirely Mobile using only my small 50cm DXM-50 antenna.

As a result,  I received my  DIAMOND  DXCC  from the  ARRL .  Many thanks.

 

More pictures of specials will follow.

DXM-antennas have well proved to be very effective antennas under all kind of installations. Because of simple and quick installation they work mobile, portable/QRP, indoor desk mount or outdoor where space is limited.

Mobile setup until June 2015

Mobile setup (from June 2015 on) plus 300W mobile amp (only if needed)

 

 

 

                   

St. Elmo's fire   you should not see at top of your mobile antenna

Home made 120 W HF Mobile TRX

This is my compact but powerful homemade mobile TRX which I designed and constructed some years ago. The radio covers 0.01 to 30 MHz continuously. All electronics are inside a special aluminum diecast heatsink as cabinet. The TRX is µ-processor controlled from a high performance low noise PLL-oscillator at 0.1 Hz resolution. First IF at 48 MHz passes a custom built 6 kHz crystal roofing filter and second IF at 9 MHz passes a KVG 2.4 kHz crystal filter. Both filters work bi-directional - RX and TX. All mixers are high level models. A pair of PT-9780 final transistors provides up to 120 watts of RF-power broadband. As a second TRX in my car I run the well known FT-857. I mainly take it for mobile CW operation because it's got the DSP, Hi.

 

Base Station

 

All Home made Solid State HF Amp ( 2013 )   4 x MRF 150

DIY Home made Solid State HF Amp ( 2016 )    2 x BLF 188 XR

Me in 1912 as Pedestrian Mobile                                          

Me in 1967 - home made AM/CW 40W TX , home made electronic keyer

Personals

Being a consultant in governmental Communications and Media projects for more than 30 years, I have projected and commissioned all kind of commercial high power AM and FM Broadcast stations + their antenna systems as well as TV and Satellite systems. I also designed and manufactured Broadcast sound studios, Television video studios and OB / ENG / SNG vans. I work in the US, in Asia and in Africa.

I was also licensed as 4S7RZ and 9X5LW.

Languages spoken and written fluently:

English - French - German

 

Some of my little time I spend on collecting and restoration of all kind of old commercial radio - and ham radio equipment, microphones and morse keyers, old broadcast studio equipment and photo / film -cameras to then let it go to my collection. Donations are welcome.

Thanks for looking up my page.

73 de DK2RZ - member of DARC - DOK C26

8404473 Last modified: 2017-10-22 19:12:34, 8887 bytes

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