[50mhz] [Magic Band EME] RE: IQ+ RevB ready for delivery

Fri Oct 26 10:21:17 EDT 2012

Hi Chris!

MNI TNX for sharing such a well documented project with us!  It will be most 
interesting to learn how it works for you - both on EME and on inonospheric modes.   
When I first made some meteor scatter contacts a few years ago with FSK441, I was 
struck by the very rapid QSB on the waterfall during 6m meteor scatter bursts. If you 
are going to be using the IQ+ type of adaptive polarization reception, it will be 
interesting to see if this type of QSB disappears.

I know the general rule of thumb is that there is so much jumbling of polarization in 
ionospheric modes of propagation, that it makes no difference whether you are 
vertically or horizontally polarized.  Certainly, those who have worked DX from the 
car with a quarter wave whip can attest to the fact that it still works! However,  I 
wonder if other reports of certain ionospheric signals only being received on 
antennas at various heights above ground may also have something to due with 
polarization shifts and the fact that ground gain lobes (and nulls) are different for 
vertical and horizontally polarized signals.  It will be very interesting to see if 
your experiments with dual polarization on 6m will teach us anything new about these 
signals.

Just in case anyone is thinking about taking on the construction of a four yagi dual 
polarized array, I think NZ5N has done a very nice job documenting how it can be done 
properly for 2m:

http://www.qsl.net/nz5n/eme4x.htm

Of course, it is more challenging mechanically to pull it off on 6m, but a "small" 
array of dual polarized 4 or 5 element yagis on 6m really is not that much larger 
than the 10 element beams shown for 2m, and the mechanical design approach is still 
very similar (although a bit larger all around).

It will be very interesting to learn more about the effects of fading on 6m as more 
people construct cross polarized arrays! Many thanks for taking the plunge!   GL and 
VY 73, Lance

On 10/26/2012 1:35 PM, Chris Gare wrote:
> Well here is one person who is brave enough!
>
> The X-P WOS LFAs are coming along fine business. Whether they will help who
> knows but it'll be fun finding out! The back-up plan if adaptive
> polarisation is a waste of time on 6M is just to take the vertical elements
> off the booms and revert to H only. Simple.
>
> http://www.gare.co.uk/6m_antenna/x-pbaying.htm
>
> http://www.gare.co.uk/6m_antenna/x-pbuild.htm
>
> Oh, and by the way, the X-P version is less weight that the H only version
> of the WOS LFA.
>
> Chris G3WOS
>
> -----Original Message-----
> From: MagicEME at googlegroups.com [mailto:MagicEME at googlegroups.com] On Behalf
> Of Lance Collister, W7GJ
> Sent: 25 October 2012 00:22
> To: Jim and Hannelore Fisher
> Cc: Magic Band EME Group
> Subject: Re: [Magic Band EME] Fwd: [Moon-net GG] IQ+ RevB ready for delivery
>
> Hi Jim,
>
> In your situation, I don't think it would be applicable.  However, there are
> a few people talking about trying to build 6m EME arrays with dual polarity.
> In such cases, the IQ+ would automatically electronically adjust for the
> proper polarity, so
> you would not notice any receive attenuation due to polarity rotation.   As
> you have
> noticed, 6m EME signals often experience rapid QSB, and a JT65A trace can
> often look like "a dotted line" as signals experience rapid fading greater
> than 10 dB.  Because these changes are so rapid, it is not possible to
> manually switch polarities and study what is taking place.  That is why a
> device such as the IQ+ offers quite a technical advance for those stations
> brave enough to try to construct cross polarized arrays on 6m.
>
> However, unlike the higher frequencies, it is uncertain exactly how much
> attenuation/QSB on 6m EME signals is actually due to polarity rotation
> rather than
> other ionospheric effects.   We hope to gain more information on this if
> people
> become active with larger cross polarized antenna arrays for 6m EME.
>
> VY 73, Lance
>
>
> On 10/24/2012 10:47 PM, Jim and Hannelore Fisher wrote:
>> I'm potentially interested. How does the non-dual-polarization,
>> single-channel setup improve performance?
>>
>> 73,
>>
>> Jim, VE1JF
>> ----- Original Message ----- From: "Lance Collister, W7GJ"
>> <w7gj at q.com>
>> To: "Magic Band EME Group" <MagicEME at googlegroups.com>
>> Sent: Wednesday, October 24, 2012 10:10 PM
>> Subject: [Magic Band EME] Fwd: [Moon-net GG] IQ+ RevB ready for
>> delivery
>>
>>
>>> In case anybody in the 6m EME group is scheming trying to figure out a
> way to do
>>> dual polarization on 6m....   GL and VY 73, Lance
>>>
>>>
>>> -------- Original Message --------
>>> Subject: [Moon-net GG] IQ+ RevB ready for delivery
>>> Date: Wed, 24 Oct 2012 20:05:37 -0000
>>> From: Alex Artieda <hb9dri at emeham.com>
>>> Reply-To: hb9dri at emeham.com
>>> To: <Moon-net at mailman.pe1itr.com>
>>> CC: <moon-net at googlegroups.com>, <linrad at googlegroups.com>
>>>
>>>
>>>
>>> Dear Friends
>>>
>>> After some delays created by some providers I'm able to initiate the
>>> IQ+ RevB delivery now!!.
>>>
>>> Actually the pre-order list has 55 pre-orders, having all parts with
>>> me the assembling and calibration process will be very fast and
>>> smooth. If you already has a pre-order open don't worried, you will
>>> be contacted by me within the next 7 days, otherwise send me and
>>> email to review your pre-order status.
>>>
>>> If you don't know nothing about the IQ+ and Adaptive polarization
>>> just take a look in http://www.linkrf.ch , you will learn how to
>>> defeat Faraday rotation and improved your EME station performance with
> the IQ+.
>>> I plan to deliver all pre-orders until now within the next 3 weeks
>>> and to avoid long waiting times now is the right moment to place your
>>> pre-order to short the delivery time.
>>>
>>> I want to extend my thanks to the entire EME community for the great
>>> response I had about the IQ+, especially after the EME Conference in
>>> Cambridge, if you have any question about how to use that radio in
>>> your system don't hesitate in contact me, doesn't matter if your
>>> system is not capable for dual polarization ,several IQ+ single
>>> channel radios are already deployed and users report extraordinary
>>> performance even with lineal polarization.
>>>
>>> 73 de Alex, HB9DRI
>>> LINKRF
>>>
>>>
>>>
>>> --
>>> _______________________________________________________
>>> To post to this group, send email to moon-net at googlegroups.com For
>>> more options, visit this group at
>>> http://groups.google.com/group/moon-net?hl=en
>>>
>>>
>>>
>>>
>>>
>>
>>
>
> --
> Lance Collister, W7GJ
> (ex WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX, 3D2LR, 5W0GJ, E6M) P.O.
> Box 73
> Frenchtown, MT   59834-0073
> USA
> TEL: (406) 626-5728
> QTH: DN27ub
> URL: http://www.bigskyspaces.com/w7gj
> Windows Messenger: W7GJ at hotmail.com
> Skype: lanceW7GJ
> 2m DXCC #11/6m DXCC #815
>
> Interested in 6m EME?  Ask me about subscribing to the Magic Band EME email
> group, or just fill in the request box at the bottom of my web page (above)!
>
>

-- 
Lance Collister, W7GJ
(ex WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX, 3D2LR, 5W0GJ, E6M)
P.O. Box 73
Frenchtown, MT   59834-0073
USA
TEL: (406) 626-5728
QTH: DN27ub
URL: http://www.bigskyspaces.com/w7gj
Windows Messenger: W7GJ at hotmail.com
Skype: lanceW7GJ
2m DXCC #11/6m DXCC #815

Interested in 6m EME?  Ask me about subscribing to the Magic Band EME
email group, or just fill in the request box at the bottom of my web
page (above)!