Skip to main content

4m is alive too!

First GM to 4X  one way     for  me the 2nd  time decoded by 4X1RF
To be correct I was running 40W on 4M
WSPR does not feature to set the power per band.
What a good VHF propagation tool is this WSPR !
Needed a good setup, stable and accurate frequency  drifting < 5Hz /2minutes  and make sure to stay in the 200Hz window.
 But that should not be a problem with a modern tranceiver.
And most hams already have a PC connected to use oher digimodes RTTY BPSK FSK441 JT65
etc  so why not running  WSPR ?
Why re-inventing the wheel by building a classical antique beacon  ??
WSPR is the ultimate propagation reporter  tool also for VHF that has been proven in VK and EU

WG2XPN back on the air
Published on 7 February 2015 by Brian WA1ZMS
The Experimental License for WG2XPN with one-way only beacon operations on 70.005 MHz with 3 kW ERPd from here in the US (QTH: FM07FM) has been renewed until May 1st of 2017. As such, it gives the only 4 m North American beacon an chance to be heard via TA in the EU for another 2 years. That’s a good thing in my mind. Thanks again goes to the FCC & the Society of Broadcast Engineers here in the US for their continued support; after all this portion of spectrum is still reserved for TV service only and no US 4m ham band appears possible in the future. I am always hoping for a repeat of the 7000+ km Eskip DX reports that took place in 2013. To all EU stations on 4 m: Remember to point your beams West during Eskip season and give a LONG listen on 70.005 MHz. You might just hear something!

Why is WG2XPN  not using WSPR mode  that wonders me.
WSPR  beacons are continuous monitored and reported automatically
No opening would be unnoticed this way.
Many propagation paths are reported by WSPR that are not noticed otherwise.
F.i. the aurora enhanced greyline openings to VK at 80 and 160m
Now someone has to check 70.005 random by coincidence for WG2XPN

Move it to 70091 if allowed and switch to WSPR mode  it is then 2-way TX and RX.
no need for 3kW ERP!   50W in a yagi would do

 2015-07-17 17:34  GM4FVM  70.092463  -24  2  IO85wu  5  4X1RF  KM72ls  3832  116 
 2015-07-17 17:44  GM4FVM  70.092463  -21  1  IO85wu  5  4X1RF  KM72ls  3832  116 
 2015-07-17 16:26  PA0O  70.092546  -26  0  JO33hg  5  4X1RF  KM72ls  3201  124 
 2015-07-17 17:38  PA0O  70.092552  -15  0  JO33hg  5  4X1RF  KM72ls  3201  124 
 2015-07-17 16:14  PA0O  70.092547  -17  -1  JO33hg  5  4X1RF  KM72ls  3201  124 
 2015-07-17 16:38  PA0O  70.092556  -26  0  JO33hg  5  4X1RF  KM72ls  3201  124 
 2015-07-17 17:34  PA0O  70.092553  -11  0  JO33hg  5  4X1RF  KM72ls  3201  124 
 2015-07-17 16:02  PA0O  70.092545  -21  0  JO33hg  5  4X1RF  KM72ls  3201  124 
 2015-07-17 18:10  PA0O  70.092551  -25  0  JO33hg  5  4X1RF  KM72ls  3201  124 
 2015-07-17 18:14  PA0O  70.092551  -13  0  JO33hg  5  4X1RF  KM72ls  3201  124 
 2015-07-17 13:32  PA0O  70.092541  -26  -3  JO33hg  5  M0NKA  IO92ak  583  264 
 2015-07-17 09:04  PA0O  70.092544  -25  0  JO33hg  5  G6HSM  JO01mg  440  242 

70MHz Special ES 17 July    4m decoded by 4X1RF


Popular posts from this blog

SPF5189z Low noise preamp 23cm

14-4-2018 updated

Above the low noise  preamp 50 - 4GHz    ebay  6€

Tested  2 small porto antennas
1 Baofeng UV antenna left   2nd best signal on PI2NOS
2 eBay DIAMONDSRH805S  wide band 144/432/1200  it works for its size as expected
3 piece of wire :   best signal in the setup...

Unit under test at workbench.
It was stable  50mA  at 5V   few days,  but sudden the current went up to 100mA
And i could  no longer adjust it with the negative bias Voltage.
The - Voltage went to zero and the SPF input port became low Z.
This SPF5189z was broken  no oscillations, no input overload just it broke while i was receiving the PI2NOS 430.125 using a small antenna at the workbench.

The specs of  SPF5189z  say it has an internal circuit  regulating the bias current.
Replaced . again   with an other of the 5 spare SPF i have.
The new one again could be adjusted at 50mA  5V 
The current raises to 150mA  when removing the  negative gate voltage.
Where is that internal bias circuit ?
I suspect  eBay …

2011-01-22 DIAMOND X30 2m 70cm 1m30 Colinear inside

Having relative poor signals on the local 70cm / 2m channels using this Diamond collinear 70/2 combi antenna at a height of 25m. I needed to investigate what could be wrong.
Measuring the cable only 3W is left for the antenna of the 10W 435MHz output from a IC451E
The cable is 30m type H100 Z50 10mm outside diameter it is semi air-spaced but has an impossible 4mm² solid CU inner conductor not much air left. I preferred the H43 Z75 cable having lower loss and mechanical better ratio in conductor size but it is no longer selling i think. This H43
3W should be enough for a comfortable noise free FM signal. But only 27km away at PA0A the signal is weak too weak something must be wrong? I made a simple reference dipole of 2x17cm CU wire.
With this dipole the signals where totally worse. So the Diamond does work?
I got curious to look inside. Maybe moisture penetration degraded the antenna.
This  antenna is rainwater close in its normal vertical mounting position. But take care if your mast can b…

Nice opening10m and 12m to S.A.

SFI  low 70 a 16 K3  still 10m opened up in afternoon to N-Italy EA5 F JN33
F/PD0OHW/M in JN33 decoded 150mW

VP8LP  12m    2-way with GP 7m ag swr 1:3

60m 5,362 open to ZL every? morning