PE1ITR 70MHz Station
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
- 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.
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
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
- The Four Metres Website
- DX Summit 70MHz SPOTS
- E-skip information
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.
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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