Projects

SuperSperrtopfSuperSperrtopf

Double stack 1/2 lambda x 2 with sperrtopf matching base.

Welding Rod Slim-jimWelding Rod Slim-jim

My earliest homebrew 2m antenna. Slimjim made from 3 pieces of 1m brass welding rod. I installed this antenna in the attic to protect from lightning and weather. It can trigger repeaters on Genting, Bukit Lanjan and Gunung Telapa Buruk. 9M4RES, Astra, 9M2RUK, 9M2RKK, 9M2RTB, 9M4RCN, 9M4RBC

Sperrtopf-homebrew Antenna


 

 

 

 

 

 

 

 

 

 

 

 

Sperrtopf Antenna with silicon sealing between element and sleeve

 

 

 

 

 

 

 

 

 

 

 

Bottom view of Sperrtopf antenna.
Look at the shorting of the element and sleeve

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sperrtopf installed


Sperrtopf installed on a letter box

 

Folded Colinear Antenna


Folded colinear antenna made from brass welding rod
supported by PVC pipe.
Now it belongs to 9W2JAZ ’sob’ ’sob’…

Folded Colinear antenna at dawn
distant record Shah Alam – Kajang 4-7 (1 Watt),
Kajang – Genting repeaters 5-9 (100milliWatt)

Aluminium Folded Colinear antenna
not yet tested

Plan for Folded Collinear Antenna Plan1 Plan2

HB9CV – Phased Array Antenna


HB9CV Phased Array made from 9mm diameter Aluminium tube
with a 20mm squre Aluminium boom.

Another view of HB9CV Phased Array

Feeding HB9CV Antenna
Look at the 56pF capacitor. It is a 1kV capacitor salvaged from a Network Interface Card

Plan for HB9CV antenna Plan

1/4 Wave Whip Antenna (Mobile)


Whip antenna made from Stainless Steel Rod, soldered to PL259 connector.

Nice looking antenna but look so cheap, so it cannot grow legs…. you know what I mean?

5 Responses to “Projects”

  1. 9w2yes Says:

    August 21, 2007 at 10:54 pm

    best nampak slim g abg. boleh tlg buat satu tak… berapa harganya.
    pls call me back.

    Reply
  2. 9w2alz Says:

    August 23, 2007 at 5:44 pm

    Slim-jim yg dalam attic tu ke? yang tu dulu modal dalam Rm5 sahaja sekarang tak tau la harga copper dah mahal. Maybe next-time ada dalam flea market.

    Reply
  3. rizal putrajaya 8734 Says:

    September 5, 2007 at 11:40 am

    aSSALAMuaLAIKUm

    AbG TOLONG KASI NO 55 ABG saya nak JumPa lah
    Pasai Antena Abang Tu
    Ini No 55 saya : 017-3196873 Abg Aji Putrajaya

    Reply
  4. 9w2alz Says:

    September 6, 2007 at 4:18 pm

    Prototype Sperrtopf ada dekat 9W2CIA kalau nak copy…no tel dia dah sms

    Reply
  5. rizal putrajaya 8734 Says:

    September 7, 2007 at 9:21 am

    Tq Jazakallah dah jumpa Ustad Zubir dan Ustad dah QSO dengan CIA dalam jaluran Insyaallah CIA akan beri diagram antena tuu/

    Apa apa pun terima kasih atas segalanya

    Rizal Putrajaya8734

    Reply

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