ad: L-HROutlet
ad: l-assoc
ad: l-innov
ad: l-gcopper
ad: l-rl
ad: L-rfparts
ad: Subscribe
ad: l-Waters
DL7RU Germany flag Germany

Login is required for additional detail.


Ham Member Lookups: 3516


40m Mono-Band Mobil-Antenna for Roof Rack installation

Loading coil is 25.2µH / 21 Turns / Diameter 85mm / Lenght 84mm / Q : 953 at 7.18 MHz / Wire is 2mm CuL (enamelled Copper) / self (parallel) resonant at 31.7 MHz / Winding pitch 4 mm / Coil-former 2mm Fiberglass / Isolator tube through the coil is a 20x3mm Fiberglass Tube. The Isolator tube also takes  the bending moment from the coil-former away

Matchbox:  LC-Low pass matching 7.9 Ohm to 50 Ohm / The Coaxial balun has 11 (or more) Turns Coax-cable RG316 (50 Ohm Teflon) on FT140-43 Core and is employed to keep RF off from the exterior of the feedline (~ -30 dB) / matching L (0.4µH) is Part of the Loading coil / matching C is 1020pF (470+330+220pF) to Ground / 100k 2 Watt Mox-Resistor to Ground for discharge static electricity

Two Antenna groundwires (6 mm2, red) are connected to the upper screws of the trunk door lifters (Plug contact)

IC-7000 Controlling Unit clips on the grid of the freshair exhaust (with 3cm distance)

Antenna foot is made from a Boat stanchion base 25mm / a short piece of 23.5 x 1.5mm Aluminum tube is glued in with UHU-Endfest-300 Epoxy cement / Ground base is a part of a 20mm thick Acrylic board

Icom IC-7000 /  A Step-Up Converter (grey housing) gives me a regulated 13.8 Volt DC output for the Transceiver even if the Battery voltage drops down to 10.5 Volts / Battery is 12V/60Ah / They are no connections to the Car (wiring) except the Tuner grounding at the trunk door

Antenna roof rack is made by 19.5x19.5x1.5mm Aluminum square tube

All worm clamps are stainless steel / The U-Bolts are home made and bended from 6mm stainless steel threaded rods

Antenna Dates: Length above the Coil 123 cm / Lenght overall (from the bottom off the acrylicboard to the top) 155 cm / Radiating-Element is a Aluminum tube 23.5x1.5mm ( 100cm), upper adjustable Tuningelement (30cm) is 19.5x1.5mm / Input Impedance (jX=0) 7.9 Ohm at 7.061MHz / SWR with Matchbox at resonance point 1:1.02 / SWR 1:2 Bandwidth 27kHz / Upper end of the Antenna above Earth-Ground: 323 cm / 1mm in length variation gives 2 kHz in Frequency variation / calculated Antenna efficiency (with formula from DL9AH) ~ 78%

All Aluminum-Elements are from the DIY-Market see http://products.alfer.com/Produkte/Eisenwaren/combitech-System-Basis/System-Profile-Aluminium/Rundrohr.html

This Antenna considered the wide experiences of Arno Weidemann (DL9AH) see www.dl9ah.de

Vy 73 Andy DL7RU   2014.07.31 

DARC-DOK: D01   -  e-mail: DL7RU@darc.de

This is the 80m Version / Overall hight 390 cm

2007  DK8NC

6144867 Last modified: 2015-07-16 00:18:54, 4541 bytes

Login Required

Login is required for additional detail.

You must be logged in to file a report on this page

Please login now...

QRZ Logbook Summary for - DL7RU
Latest Contacts for DL7RU at QRZ.com
dedateband mode grid Country op
AX7CW 2015-05-17 30m CW PG66pa Australia Steve Salvia
W0IZ 2015-03-03 10m PSK31 EM79vi United States IGOR P ZDOROV
ZS4WW 2015-03-03 10m PSK63 JJ00aa South Africa Jacques Louw
N4CPT 2014-12-27 10m PSK31 EL98ol United States ROBERT DINGFELDER JR "Ding"
PY2DNR 2014-12-25 10m QPSK31 JJ00aa Brazil MAURO CAAPAVA SILVA
PU1SGT 2014-03-29 10m QPSK31 GG87ve Brazil Cleir Mendon�a do Couto
GM0OBX 2013-09-05 20M SSB IO86bc Scotland William D McFarland
F4GNB 2013-05-14 10m CW JN04us France Laurent ISOARD
EA3GYZ 2013-04-25 20m PSK31 JN01vr Juan Aguilera
KB1WSR 2013-01-26 10m SSB FN42go United States Ray Marchand
N8XGS 2013-01-10 10m SSB EN72vl United States RANDY A KRUTZ
K2EFG 2012-08-12 20M SSB KM71LS63 United States Yigal Rechtman
K2EFG 2012-08-12 20M SSB KM71LS63 United States Yigal Rechtman
VK4HHH 2012-08-11 20m SSB QG53vj Australia Andreas M. Kellner

Book Totals: 37 qso's   19 confirmed Get a free logbook at QRZ.COM

ad: giga-db
Copyright © 2016 by QRZ.COM
Thu Feb 11 21:13:41 2016 UTC
CPU: 0.045 sec 62282 bytes mp