PE1ITR 70MHz Station

(13-05-2012)

My first attempts on 4m are from 1984 when I builded a converter from 4m to 2m and a 4 element yagi antenna. I became active on 2007-08-29 when I finished my transverter and made my first rx attempts. The antenna was a 5 elements dk7zb yagi and this antenna is still in use. That day I monitored the I0JX/B Beacon and could receive ms bursts. Later that day I wkd I6BQI in a 70MHz - 144MHz JT6M crossband qso. From that day I heard a lot of stations on 4m.
On 2012-01-01 the dutch radio amateur got a 4m allocation from 70.0 to 70.5MHz. Maximum power 50w PEP.

This page is about my 70MHz station and the 4m expeiments

Station status:

- 5 elements 28 Ohm DK7ZB Yagi 3m or 6m agl. I am building the 6el 50Ohm DK7ZB yagi
- For contesting and remote operations 2x stacked 7el LFA yagi are used. Here are some pictures made in the RSGB 1st contest April 1st 2012.
- OZ2M 70MHz/28MHz Transverter + PA max 25w.
- FT-450D as IF TRX.

Antenna

Here is info about my 5 element 28Ohm dk7zb yagi build in 2007. It is a small antenna is on a pole in the garden. Depending on the situation the pole is 3 or 6m above ground.
At the moment I am building also the 6 element 50Ohm dk7zb yagi because of the better specifications. Pictures will be added soon.
Sporadic-E reflected signals will arive between 2 and 15 degrees elevation depending on the distance and the reflection height. Statistical the most signals on 4m will arrive between 4 and 7 degrees elevation. When my antenna is at 6m agl it is optimized for the 9 degrees elevation signals. So I will have around 6 to 1 db loss on the real dx signals. But a real good setup for Es and MS on the 1200km range.

The antenna 3m agl.


28 to 50Ohm match.


VNA swr plot


horizontal pattern


vertical pattern antenna 6m agl.


vertical pattern antenna 3m agl.

SWL and X-BAND LOG:
Date             Call	   RXFreq  TXFreq  2-Way  Mode Prop   Soundfile
2007-08-29 16:15 I6BQI     70.200  144.190 X-BAND JT6M MS
2007-09-05 18:00 GB3BAA/B  70.016          SWL    CW   TR     wav
2008-01-13 21:25 DI2PM     69.950   50.240 X-BAND SSB  TR
2008-05-21 09:00 SV1FOUR/B 70.044          SWL    CW   ES     mp3
2008-05-21 10:45 SV2DCD    70.200          SWL    CW   ES     mp3
2008-05-25 10:09 LX1FX     70.200  144.333 X-BAND SSB  TR     mp3
2008-05-25 10:31 ES3BR     70.202          SWL    SSB  ES  
2008-05-25 11:08 ES5AM     70.200          SWL    SSB  ES     mp3
2008-05-25 11:16 ES1II/8   70.200          SWL    SSB  ES     mp3
2008-05-25 12:06 ES3RF     70.200          SWL         ES
2008-05-27 17:30 EI2IP     70.200          SWL    SSB  ES     mp3
2008-05-27 17:33 IZ8DWF    70.200          SWL    SSB  ES     mp3
2008-05-27 17:50 SV8CS     70.205          SWL    SSB  ES
2008-05-27 17:55 LX2LA     70.203          SWL    SSB  TR
2008-05-27 18:25 SV2RM     70.204          SWL    SSB  ES
2008-05-28 09:40 J49K      70.200          SWL    CW   ES     mp3
2008-06-01 10:06 CT1HZE    70.200          SWL    SSB  ES     mp3
2008-06-01 10:10 CT1FFU    70.195          SWL    CW   ES     mp3
2008-06-04 14:14 I6BQI     70.201          SWL    SSB  ES     mp3
2008-06-04 15:23 IK0BZY    70.200          SWL    SSB  ES     mp3
2008-06-08 07:18 YO4FYQ    70.200          SWL    SSB  ES     mp3
2008-06-25 16:21 9A6R      70.207          SWL    SSB  ES     mp3
2008-06-25 18:50 IW0FFK    70.194          SWL    CW   ES     mp3
2008-06-25 19:35 CS5BFM/B  70.166          SWL    CW   ES     mp3
2008-06-25 19:46 OY3JE     70.200          SWL    SSB  ES     mp3
2008-06-30 17:40 EI3IO     70.203          SWL    SSB  ES     mp3
2008-06-30 17:59 G0UWK     70.206          SWL    SSB  ES     mp3
2008-07-02 07:11 IS0AWZ    70.200          SWL    SSB  ES     mp3
2008-07-02 07:13 I7CSB     70.200          SWL    SSB  ES     mp3
2008-07-02 07:13 I0JX/B    70.088          SWL    CW   ES
2008-07-02       IK0SMG    70.200          SWL    SSB  ES     mp3
2008-07-11       I0JX      70.200          SWL    SSB  ES     mp3
2008-07-11       IK0OKY    70.200          SWL    SSB  ES     mp3
2008-07-11 18:29 OK2POI    70.225          SWL    SSB  ES/MS  mp3
2008-07-11 19:11 I0LYO     70.210      	   SWL    SSB  ES     mp3

DXCC: CT, DL, EI, ES, G, I, IS, J4, LX, OK, OY, YO, SV, 9A 		
4m Activity:
- The Four Metres Website
- DX Summit 70MHz SPOTS
- E-skip information

Station Pictures:
2007-08-29: Today finished the transverter and made the first rx attempts. Monitoring the I0JX/B Beacon and could receive ms bursts. Later this day wkd I6BQI in a MS 70MHz - 144MHz JT6M cross-band qso :-).




70MHz Transverter without the PA.

december 2007

4m PA just finished


The complete transverter system 25Watt output

LX/PE1ITR/P from JO30AC (June 18, 2008)







We hoped for an ES opening but nothing happened. Made 4 tropo qso's to LX 2x ,G 1x and DL 1x and one Es qso to I. We couldn't complete the tropo qso with G7RAU.
Heard a lot of MS burst of I stations. Hrd I6BQI etc.

Log: LX1FX, IZ4FUA, LX2LA, G3VYF, DI2PM


LX/PE1ITR from JO20XC (November 15, 2009)






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