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home QRZCQ - The database for radio hams 
 
2024-05-25 23:53:00 UTC
 

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DJ7TH

Active QRZCQ.com user

activity index: 0 of 5

Rolf Lehmann

77963 Schwanau
Germany

EU
germany
image of dj7th

Call data

Last update:2015-03-16 12:26:31
QTH:Schwanau
Continent:EU
Views:759
Main prefix:DL
Class:A
Latitude:48.3687629
Longitude:7.7794307
Locator:JN38VI
DXCC Zone:230
ITU Zone:28
CQ Zone:14
Website:www.dj7th.de

Most used bands

20m
(48%)
40m
(29%)
10m
(14%)
80m
(6%)
15m
(4%)

Most used modes

SSB
(65%)
PSK31
(20%)
PSK63
(8%)
SSTV
(7%)
RTTY
(2%)

QSL data

Last update:2015-03-16 12:18:10
eQSL QSL:YES
Bureau QSL:no
Direct QSL:no
LoTW QSL:no

Biography

It all started anno 1958 with the kit "RadioMan" from KOSMOS, followed by several years with tinkering of HF-receivers (0V1, 0V2, etc.). For that I've mostly used parts from cannibalized radios made in the late '40s.

1961-1962 I build my first HF AM-Transmitter using a RV12P35 tube, later a LS50 tube in the PA. In 1962 and 18 years old I got finally my license Class A, Class B followed "automatically" in 1963.

Over time, my interest shifted from HF to the higher frequencies. In 1977 I was involved in the construction of our first 2m-repeater DB0WL, later in the modernization of our repeater DB0LHR and the expansion with WLAN, APRS, Echolink etc.

Home made Amateur-Radio-devices like SDR, ATV and the associated measurement technique are still one part of my "professional radio operator life" (see my website), as well as various activities in our Amateur Radio Club in the city of Lahr (www.funkamateure-lahr.de)

--------------------

Angefangen hat alles anno 1958 mit dem KOSMOS Baukasten "Radiomann", danach folgten einige Jahre mit dem Basteln von KW-Empfängern (0V1,0V2 etc.), wobei ich meist Bauteile von ausgeschlachteten Radios aus den 40er-Jahren verwendet habe.

1961-1962 entstand mein erster AM-KW-Sender mit einer RV12P35 später mit einer LS50 in der PA. 1962 erhielt ich zum 18. Geburtstag endlich die damalige Afu-Lizenz Klasse -A-, Klasse -B- folgte "automatisch" 1963.

Im Laufe der Zeit verlagerte sich mein Afu-Interesse zu den höheren Frequenzen. 1977 war ich am Bau unserer ersten 2m-Relaisfunkstelle DB0WL beteiligt, später an der Modernisierung der Relais mit APRS, Echolink und am Ausbau der WLAN-Strecken von DB0LHR.

Zu meinem "Berufsfunker-Alltag" gehören nach wie vor der Eigenbau von Afu-Geräten und die dazu gehörende Messtechnik (siehe Homepage), sowie diverse Aktivitäten im Freundeskreis Lahrer Funkamateure. Näheres dazu: www.funkamateure-lahr.de


Worked DXCCs:

Equipment

TRX Kenwood TS-50S
TRX Alinco DX-70
TRX Swan/Cubic 100 MX
+ homemade powersupply 0-30V max. 20A
+ Windom Antenna 80m....10m

homemade SDR-TRX 20kHz...30MHz, max. 8W out

homemade PA 2xPL519, max. 500W out

homemade ATV-TRX, portable, max. 5W out

Alinco FM-TRX for 2m + 70cm

Mobil: YAESU FM-TRX for 2m + 70cm

see my homepage: www.dj7th.de

Other images

second pic
DJ7TH / Teaching some kids, soldering electronic parts
  

Rev. 7bd42a0329