Hello moonbouncers,
There was very nice CW activity during ARRL contest this year (on all bands except 2m from US) and it is unfortunate I did not have a lot of free time for it.
I also “worked” JT65 logger eme (I thought: who is going to find out anyway??) and apart from constant chatter I also found JAMMING.... a lot of Jamming, even from its own creator!!?
Check a small part of it from N0UK logger:
11/19 17:04 VE3KH you being jammed by K1JT and W6YX (W7IUV Larry WA DN07dg 216.215.40.193)
11/19 17:05 Why Larry .... they on 142 also? (VE3KH Kevin ON FN03aj 24.141.203.45)
11/19 17:06 They are calling me to get a contest poitn and it ain't gonna happen!! (W7IUV Larry WA DN07dg 216.215.40.193)
11/19 17:08 Thansk Larry 73 ... Yes, I have been jumped by a quite a few stations (VE3KH Kevin ON FN03aj 24.141.203.45)
11/20 17:47 Also hr k1jt calling me -22 but not ans him (KN4SM/5WL/KW Jerry VA FM16qt 24.241.251.86)
11/20 18:02 Contest = reduced courtesy! (K5DOG/2M Stevedog NM DM52xw 65.127.140.122)
11/20 18:04 Yes, K1JT and W3SZ can hear on gold tooth. (K5DOG/2M Stevedog NM DM52xw 65.127.140.122)
One thing I wouldn’t regret missing on EME is JAMMING!!!
GL 73, Petros SV3AAF
I have this QRO-amplifier for sale but because of the weight and size, only local pickup is possible.
Think ít´s only interesting for amateurs located in Sweden.
It is advertised on:
http://www.dx-radio.se/?an=3402
Lars SM5DCX
Net Notes from 14.345 MHz Saturday 11 Feb 2012 1500Z VE3KRP Eddie eddie(x)tbaytel.net Thunder Bay ONT Worked a couple of stations on SSB during the contest. Some weather issues, wind off the lakes. VE4SA Shawn speters(x)mts.net Working in shack today. Looking to sell 13cm equipment: Spectran 180W Amplifier, 2m-13cm Transverter, G4DDK LNA. Concentrating on 23cm for the time being. Contact him via email for more info. VE4MA/W7 Barry Arizona Working on 5.7 gear. Now has 2m transverter working and expects to have 23cm up and working by next month. WB7QBS glennwb7qbs(x)hotmail.com Sunnyside WA Glenn's email report: There is an artcle in the March QSTthat explains the squirlyness of HF propagation. I hrd U best on my vertical Outbacker.
I have a Sked. with K4EME 432.040, Sun. 2/12/12 1100 Z. May "THE FARADAY" be with us,"hi".
I have "The Most Important Job in theWorld": Preparing 5the Fischer's coffee for the Lutherans
across the street. If I don't hear U in the AM, I will E-Mail U. 73's Glenn WB7QBS (thanks Glenn...sorry the propagation is not with us during the net hours.)
N4PZ n4pz(x)live.com Steve was not able to make it on today but expects to be on tomorrow, Sunday. WB2BYP John storyavenue(x)hotmail.com Presented some recordings of spectrum from last week's 23cm SSB event at Rochester VHF Group with K2DH and W2CNS. Nice CW recording of N4PZ and HB9BBD, 20-30 dB out of the noise. 2012 EME Conference. Info at www.eme2012.com
Thanks, WB2BYP Johnstoryavenue(x)hotmail.com or wb2byp(x)arrl.net
Hi Folks,
I bought this powersupply SNT Emerson BML 231 204/5
It is standard set to 54Vdc output and contains a fiber optical interface.
No further adjustments at all.
Is there any-1 who has experience with this kind of powersupplies and configured it down to 48Vdc?
Met vriendelijke groet,
Jan Pa0PLY
Andy,
Both are feeds used on dishes:
The scalar ring is really a choke ring and used to control RF fields
at the mouth of the horn. It can be used on both septum and
non-septum feeds. Typically, it is needed for dishes < f/d = 0.4
(f/d= focal distance/diameter and is a measure of how deep a dish
is) High f/d ratios require a horn with wider beamwidth (aka less
gain). The VE4MA horn is one that commonly used for
f/d<0.4 "Scalar" choke rings are used on the cylindrical "VE4MA"
dish to cut off sidelobes on the dish pattern by suppressing
radiation on the outside of the mouth of the horn. The basic VE4MA
horn is simply a section of cylindrical wave guide with one end closed.
On 1296 circular polarization is used. For eme the standard is to
transmit in RHCP and receive in LHCP. RH=right hand; LH=left hand
and refers to which direction the RF wave rotates. The easiest way
to visualize it is by thinking of how a nut rotates on a bolt on RH
thread vs LF thread. The reason two senses of CP are required is
that CP is reversed upon reflection from the surface of the Moon.
To generate a circular polarized signal there are two basic methods:
1) using a hybrid to feed two probes inside a horn at right angles to
each other with RF phased by 90-degrees, or
2) using a septum feed horn which has a stepped center plate running
down the middle of a section of waveguide (either square or
cylindrical shape). This plate is called the septum and it separates
two probes inside the horn. One is used for Rx and the other for Tx
and the nature of the septum is that is produces circular
polarization of both senses but opposite at each probe.
There is actually a third method which uses tuned stubes to generate
CP. It is very effective but difficult to properly tune. The
septum's advantage is its simplicity and high efficiency. In the
septum the two polarities are produced without need of external
hybrids (which add loss) and fairly high isolation exists between Rx
and tx (typically 24-dB). This eliminates use of high power TR
relays. One needs typically 60-dB isolation (for power up to 1kW) so
a fairly low-power relay can be used on the Rx port to add isolation
(typically a mw sma relay). e.g. 1000w (+60 dBm) - 24-dB = +36 dBm
(4w). The relay must be able to handle 4w (easy) and have more than
36-dB isolation (also easy). The relay needs very low insertion loss
(not easy).
For dishes like mine with f/d=0.5 higher gain is needed (smaller
beamwidth) to properly illuminate the surface of the dish without
spilling over the edge. This is done with either flared horns (like
I am using) or something called a dual-mode horn.
This is just a simplification of the general issue of dish feeds and
the best tutorial is given by W1GHZ's Microwave Antenna Book (on line).
73, Ed - KL7UW
At 06:15 AM 12/17/2011, Andy Furlong wrote:
>Hi Ed...this is Andy WA2FGK...
>I am a newbie on EME...ABOVE 432 MHz
>I have 500 watts on 1296 out of a DB6NT Amp and a 12 foot dish.
>QUESTION...WHAT IS THE ADVANTAGE of a Septum Feed....vs
>whatever the type of feed is called that has the SCALAR ring?
>
>NOT a newbie to EME as we are on 144 MHz(WAS #163)
>and 222 MHz with 4 x 7W M^2 and have 6 initials off the moon...
>and have worked 432 MHz with 4 18 foot Directive System Antennas,
>but now serious about 'movin-on-up' to 1296 and 2304 Mhz.
>Would appreciate any info on one feed vs the other.
>Thanks and 73
>Andy
>
>
>At 03:30 AM 12/17/2011, you wrote:
>>I don't recall who expressly asked for my measurements so I will
>>put here for all:
>>
>>Test equipment:
>>K3 + 15 dB atten* + DEMI 1296-28HP => Bird43(10K element) =>
>>1w, *needed to reduce output to 1w
>>HP432A + 20 dB coaxial atten (10w)
>>
>>I ran approx 2w into the Septum Tx port (NF) to measure isolation
>>at the Rx port (sma-F):
>>1) Reference level adjusted so HP432 reading +10.0 dBm
>>2) Measured = -12 dBm at Rx port, indicating isolation of 22-dB
>>Adjustment of tuning stubs did not affect the isolation.
>>3) Input SWR ~ 1.5 (previous measurement of SWR with 60w on the
>>dish indicated no measurable SWR) so perhaps may be some reflection
>>inside the room?
>>
>>Next I measured insertion loss and isolation of my sma relay used
>>at the Rx port.
>>1) Reference with +30 dBm (1w) indicated on the Bird43. HP432A
>>read +7.8 dBm (22.2 dB atten: combination of cables+adapters+20 dB atten).
>>2) Output thru the relay plus short .141 jumper = +7.7 dBm
>>indicating insertion loss = 0.1 dB**
>>3) Output on unswitched port of the relay with switched port
>>terminated with 5w sma load was unmeasurable on the lowest setting
>>of HP432 implying better than 37.7 dB isolation.
>>
>>I could have run the transverter up to 25w (+43 dBm) to increase
>>range of the reading of the HP meter but figured relay isolation
>>quite adequate for running 300w into the septum. +24.7 dBm -22dB
>>-37.7dB = -34.9 dBm into the preamp.
>>
>>These measurements were taken with septum off the dish inside the
>>house. Once I have the new feed mount bracket constructed and
>>septum reinstalled these measurements will be repeated to determine
>>effects of reflections from the dish. Placing my hand over the
>>mouth of the septum showed increase power reflected into the Rx
>>port showing lessening of isolation a couple dB as expected.
>>
>>**Measurement accuracy probably not better than 0.1 dB.
>>
>>
>>
>>73, Ed - KL7UW, WD2XSH/45
>>======================================
>>BP40IQ 500 KHz - 10-GHz www.kl7uw.com
>>EME: 50-1.1kw?, 144-1.4kw, 432-QRT, 1296-?, 3400-?
>>DUBUS Magazine USA Rep dubususa(a)gmail.com
>>======================================
>>
>>_______________________________________________
>>Microwave mailing list
>>microwave(a)lists.valinet.com
>>http://lists.valinet.com/cgi-bin/mailman/listinfo/microwave
>
>
>73, Ed - KL7UW, WD2XSH/45
>======================================
>BP40IQ 500 KHz - 10-GHz www.kl7uw.com
>EME: 50-1.1kw?, 144-1.4kw, 432-QRT, 1296-?, 3400-?
>DUBUS Magazine USA Rep dubususa(a)gmail.com
>======================================
To: MAP65 users
From: Joe Taylor, K1JT
A new revision of the beta release of MAP65 2.0 has been posted at
http://www.physics.princeton.edu/pulsar/K1JT/MAP65_199r443.exe
If you need instruction about what is different about MAP65 2.0, or how
to install it, go to
http://physics.princeton.edu/pulsar/K1JT/Beta_Release_of_MAP65_2.0.pdf
The main changes in r443 relative to r437 are as follows:
1. Fixed a logical error in assigning "timeout age" of each decode, for
determining colors in the BandMap and Messages windows.
2. Fixed a bug that could sometimes prevent decoding of strong signals.
3. Support for "JT65 v2.0" message formats has been added. (A
description of v2.0 of the JT65 protocol will be announced soon.)
Please keep your reports coming, good or bad!
-- 73, Joe, K1JT
Several microwave EME operators have asked if I am going to propose some dates for Microwave Activity weekends. These have been quite popular in the last few years as a way of helping stations who are just getting going on the bands of 9 and 6cm to be able to test equipment with the knowlege that there are bigger stations on the band and without the time constraints of contest operation.
The moon timing and position is becoming really difficult for the Northern hemispere in that perigee and high declination are way out of phase. I think its probably better to go for high declination weekends with maximum moon time rather than the lower loss choices where the declination is -5 to 0 degrees and consequently much shorter window.
My suggestion is July14-15 for 6cm and September 8-9 for 9cm. for the high declination weekends OR July 7-8 6cm and September1-2 9cm for the lower loss, low declination option.
Please let me know your views. Biggest window or Lower loss.
73 Peter G3LTF
I will shortly be parting out the following pieces of equipment since no
takers as a whole.
8590A, 8594A, 8970A, 8350A (2), and an 8656B.
Let me know if you are looking for some parts. If no takers on this then
off to the scrap yard.
Pete WA2ODO
__._,_.___
~-|**|PrettyHtmlEnd|**|-~ end group email -->
On 2/28/2012 11:33 AM, Peter wrote:
>
> This is a one day get it the heck out of here blow out . All have
> issues and are good fixer uppers and / or parts donors. All prices
> good only today and tomorrow (2/28 and 2/29). After this they will be
> parted out , so if you need parts please let me know. All as is, where
> is , who is, when is , why is, ... ( Not on the Megaphase cables as
> they are new.)
>
> 1 - HP 8970A noise figure meter, missing power line switch. ( Powers
> up with errors (80, 26 - Battery and 13 if cal failed ...issue in if
> section) ... powered up with switch wires connected as if a switch was
> there. Front panel good no missing segments, etc. $250 + Shipping
> PRICE DROP
>
> 2 - HP 8569A, complete, 10 Mhz to 22Ghz, no output to the display
> (display is there), typical contacts off the switch problem, good
> parts unit or fixer upper, $375 + Shipping PRICE DROP
>
> 3 - Spoken for
>
> 4 - 4 pieces of HP 8484A Power sensors all BAD but cases and
> connectors are good ... good as experimenters and or attempt to fix up
> (highly unlikely knowing HP) or cases good to make in line preamps,
> filters, or dividers which is what I originally got them for.
> $40 each + Shipping or all 4 for $150 Inc shipping. PRICE DROP
>
> 5 - HP 83590 2-20Ghz sweeper plug in, has issues, Sweeps has output
> but has unleveled light on flickering. Missing cage covers ( sheet
> metal) Being sold as fixer upper and/or parts mule. $525 + Shipping
> PRICE DROP
>
> 6 - NON-FIXER UPPER AND NEW combo of NEW NEVER USED Megaphase cables
> ... 3 - 24" Orange TM4 S1S1 - 24 SMA male each end, and 2 pieces of
> TM4-S1S1 - 84, 84" megaphase cables $100 SHIPPED CONUS ($10 of before)
>
7- HP 8350A, main frame sweeper ( no plugin included), physically
good and complete, Powers up with E004 ( power Supply error ) $125
+ Shipping
8- HP 8350A, main frame sweeper ( No plugin included), physically
good and complete, Powers up with E005 (System interface bus failure),
$125 + Shipping
9- I have a box of a few boards and modules from 8753A's and
8753C's, ask and I will look and see if I have what you are looking for
and send a price ( Yes I have a few tested samplers too ... ALL GONE).
>
> Thanks for looking,
> Pete WA2ODO
>
>
--
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