29 Oct
2018
29 Oct
'18
11:54 a.m.
I hope someone with experience on 222 MHz can answer this for me.
My EME experience is limited to 144 and 432 MHz.
At 222 MHz, what is the situation with operating on the horizon? Is
earth noise a big problem like it is at 432 MHz?
I don't have reliable sky temperature data for 222 MHz at the
moment. If I did, perhaps I wouldn't need to ask this question!
I would also like to know what is the temperature of 'cold sky' at
this frequency please?
73,
Paul N1BUG
3 Nov
3 Nov
6:14 a.m.
I want to thank everyone who replied privately to my question. Among
them were several from people who currently do or have done EME on
222 MHz.
The consensus is that while sky noise at 222 is significantly lower
than 144, it is not enough to for ground noise to be a major issue.
Man made noise is another story of course!
I have worked EME on 144 and 432 in the past with real arrays. I
have made one EME contact on 50 MHz... CW no less! I am very
motivated to work someone on 222 to claim the EME path on a fourth band.
I have just installed a long yagi (K1FO-22) for terrestrial use on
222 MHz. The weather is awful with wind, rain, and snow most of the
time but soon I will finish installation of the 7/8" feedline and
get the preamp box up on the tower.
I have a 1 kW+ SSPA which is not yet operational. I am looking for a
good deal on a 50V power supply and I also need to get a driver amp
because the 10 watts I have will not be enough. Given the scarce
supply of solid state amps for this band and very limited budget I
will probably end up building something with a 5894A tube (!) and
socket I have here. That wouldn't be my preferred choice, but I can
make it work.
73,
Paul N1BUG
On 10/29/18 11:54 AM, N1BUG via Moon-net wrote:
I hope someone with experience on 222 MHz can answer
this for me.
My EME experience is limited to 144 and 432 MHz.
At 222 MHz, what is the situation with operating on the horizon? Is
earth noise a big problem like it is at 432 MHz?
I don't have reliable sky temperature data for 222 MHz at the
moment. If I did, perhaps I wouldn't need to ask this question!
I would also like to know what is the temperature of 'cold sky' at
this frequency please?
73,
Paul N1BUG
11:22 a.m.
Paul,
Congrats on the 50-MHz Cw-eme; that is rare these days. As far as I
am aware 6m-eme is 100% digital due to marginal antennas. I just
began actual construction on one of my two 7LFA yagis for 6m. I run
a ch.2 TV Harris amp at 1000w.
You might search e-bay for the HP 50v switching PS as they are
typically about $30. I have three for powering 6m/2m/23cm PA's.
http://www.bigskyspaces.com/w7gj/hps3kw.pdf
For a sspa driver you might look at the kit from W6PQL that uses RF
power modules.
http://www.w6pql.com/1296/index.htm
although showing 1296, I believe with proper bypass caps this board
can be used on any band 50-1296. Probably lot easier than getting a
5894 running.
I ran one on 2m (Johnson 6N2) at 150w in the mid 1960's.
GL,
73, Ed - KL7UW
At 02:14 AM 11/3/2018, N1BUG via Moon-net wrote:
I want to thank everyone who replied privately to my
question. Among
them were several from people who currently do or have done EME on
222 MHz.
The consensus is that while sky noise at 222 is significantly lower
than 144, it is not enough to for ground noise to be a major issue.
Man made noise is another story of course!
I have worked EME on 144 and 432 in the past with real arrays. I
have made one EME contact on 50 MHz... CW no less! I am very
motivated to work someone on 222 to claim the EME path on a fourth band.
I have just installed a long yagi (K1FO-22) for terrestrial use on
222 MHz. The weather is awful with wind, rain, and snow most of the
time but soon I will finish installation of the 7/8" feedline and
get the preamp box up on the tower.
I have a 1 kW+ SSPA which is not yet operational. I am looking for a
good deal on a 50V power supply and I also need to get a driver amp
because the 10 watts I have will not be enough. Given the scarce
supply of solid state amps for this band and very limited budget I
will probably end up building something with a 5894A tube (!) and
socket I have here. That wouldn't be my preferred choice, but I can
make it work.
73,
Paul N1BUG
On 10/29/18 11:54 AM, N1BUG via Moon-net wrote:
73, Ed - KL7UW
http://www.kl7uw.com
Dubus-NA Business mail:
dubususa(a)gmail.com
I hope someone with experience on 222 MHz can
answer this for me.
My EME experience is limited to 144 and 432 MHz.
At 222 MHz, what is the situation with operating on the horizon? Is
earth noise a big problem like it is at 432 MHz?
I don't have reliable sky temperature data for 222 MHz at the
moment. If I did, perhaps I wouldn't need to ask this question!
I would also like to know what is the temperature of 'cold sky' at
this frequency please?
73,
Paul N1BUG
_______________________________________________
Moon-Net posting and subscription instructions are at
http://www.nlsa.com/nets/moon-net-help.html
4 Nov
4 Nov
10:03 a.m.
Thanks Ed,
I was very fortunate to get that QSO and it is one I will long
remember. I was running a 4CX1500B at 1500W and a 7 element homebrew
yagi on the horizon. No preamp and 350 feet of 3/4" CATV line. Yes,
350, not a typo. :)
I have been searching eBay every day for more than a month now. It
seems the price is now $75 and up plus shipping or $40 with $80
shipping. I have a talent for being too late to catch the sweet deals!
I believe I need at least 40W drive for full output and the highest
power RF modules I see for 222 are 30W. Ideally, I would like to
have a little headroom in the driver... say 60W capable.
I am going to try to get my hands on a solid state driver before I
build with the tube... but at least it's a backup plan. I built a 2m
driver with one many years ago.
73,
Paul N1BUG
On 11/3/18 11:22 AM, Edward R Cole wrote:
Paul,
Congrats on the 50-MHz Cw-eme; that is rare these days. As far as I
am aware 6m-eme is 100% digital due to marginal antennas. I just
began actual construction on one of my two 7LFA yagis for 6m. I run
a ch.2 TV Harris amp at 1000w.
You might search e-bay for the HP 50v switching PS as they are
typically about $30. I have three for powering 6m/2m/23cm PA's.
http://www.bigskyspaces.com/w7gj/hps3kw.pdf
For a sspa driver you might look at the kit from W6PQL that uses RF
power modules.
http://www.w6pql.com/1296/index.htm
although showing 1296, I believe with proper bypass caps this board
can be used on any band 50-1296. Probably lot easier than getting a
5894 running.
I ran one on 2m (Johnson 6N2) at 150w in the mid 1960's.
GL,
73, Ed - KL7UW
1674
days inactive
1680
days old
3 comments
2 participants
participants (2)
-
Edward R Cole -
N1BUG