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CX2SA > SATDIG 07.08.08 01:41l 288 Lines 9944 Bytes #999 (0) @ WW
BID : 24038_CX2SA
Read: GUEST
Subj: AMSAT-BB-digest V3 397
Path: IZ3LSV<IV3SCP<SR1BSZ<SP7MGD<CX2SA
Sent: 080806/2334Z @:CX2SA.LAV.URY.SA #:24038 [Minas] FBB7.00e $:24038_CX2SA
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re polarity control box - again (Angus)
2. LVB Tracker (Peter)
3. Re: LVB Tracker (Gould Smith)
4. Re: Re polarity control box - again (SV1BSX)
5. Re: Th-D7A(G) & HMC-3 (David J)
6. re Polarity control box - again (Angus)
----------------------------------------------------------------------
Message: 1
Date: Wed, 6 Aug 2008 16:06:55 +0100
From: "Angus" <angus(AT)young5769.freeserve.co.uk>
Subject: [amsat-bb] Re polarity control box - again
To: <amsat-bb(AT)amsat.org>
Message-ID: <B92E83FFFDF74AF4B1FF0524ADEA5B33(AT)GusPC>
Content-Type: text/plain; charset="iso-8859-1"
Hi all, its me again, sorry.
OK got the 2mtr polarity control box working and very pleased, except for one
very small item.
LHCP never seemed to me to be 90 degrees out of phase with RHCP, never had the
large drop in signal I expected.
OK time for a bit or research and looked in to my VHF/UHF manual and found the
pages and guess what, the design we have been using is wrong, or so I think,
please correct me if I am wrong.
OK both yagis have a 1/4 wave 75 ohm matching system to allow the system back
to work with 2 x 50 ohm yagis in parallel, in case anyone forgets, so for
Vertical both yagis fed in phase, for Horizontal the 135 degrees yagi is fed
with a 1/2 wave of 50 ohm line to delay it by 180 degrees, no problems so far.
For RHCP the 45 degrees yagi is fed with a 1/4 wavelength of 50 ohm delay
line and again no problems.
NOW HERE'S THE RUB!
For LHCP we feed the 135 degrees yagi with a 1/4 wavelength of 50 ohm line,
woops the system has a 1/2 wavelength of 50 ohm line!
So instead of feeding as we should we are feeding it to make it simpler than
it should be. Hence I was never happy that LHCP was never quite 90 degrees out
with RHCP.
So quite possibly we are going to get some form of strange oval type of
polarity anyone take a guess at its true nature, I may have a play around with
one of the antenna programs and see what comes out.
Am I wrong completely on this or is it the better to have it off a little on
LHCP to get the other 3 polarities correct?
Sorry for boring some of you.
regards
Gus M0IKB
------------------------------
Message: 2
Date: Wed, 06 Aug 2008 11:35:42 -0400
From: Peter <roi(AT)optonline.net>
Subject: [amsat-bb] LVB Tracker
To: AMSAT-BB(AT)amsat.org
Message-ID: <001a01c8f7da$49274260$6701a8c0(AT)peter>
Content-Type: text/plain; charset=Windows-1252
Hello,
I am trying to setup Rotor Control using SatPC32 and LVB tracker; I am not
finding the com port setup location. I would appreciate it if someone could
walk me thru the Rotor setup, thank you.
73 Pete, WB2OQQ
------------------------------
Message: 3
Date: Wed, 6 Aug 2008 12:00:51 -0400
From: "Gould Smith" <gouldsmi(AT)bellsouth.net>
Subject: [amsat-bb] Re: LVB Tracker
To: "Peter" <roi(AT)optonline.net>, <AMSAT-BB(AT)amsat.org>
Message-ID: <F70C71C2C16D4DB4BFA004D4F3576BB6(AT)GouldMainPC>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi Peter,
Do you have the Installation instructions from the LVBTracker.com site?
It takes you through the installation and setup process.
Let me know if you have any specific problems.
73,
Gould, WA4SXM
----- Original Message -----
From: "Peter" <roi(AT)optonline.net>
To: <AMSAT-BB(AT)amsat.org>
Sent: Wednesday, August 06, 2008 11:35 AM
Subject: [amsat-bb] LVB Tracker
> Hello,
>
> I am trying to setup Rotor Control using SatPC32 and LVB tracker; I am
> not
> finding the com port setup location. I would appreciate it if someone
> could
> walk me thru the Rotor setup, thank you.
>
> 73 Pete, WB2OQQ
>
> _______________________________________________
> Sent via AMSAT-BB(AT)amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 4
Date: Wed, 6 Aug 2008 19:38:38 +0300
From: "SV1BSX" <sv1bsx(AT)yahoo.gr>
Subject: [amsat-bb] Re: Re polarity control box - again
To: "Angus" <angus(AT)young5769.freeserve.co.uk>, <amsat-bb(AT)amsat.org>
Message-ID: <000f01c8f7e2$e35076b0$0b09a8c0(AT)zeus>
Content-Type: text/plain; format=flowed; charset="windows-1253";
reply-type=original
Hi Gus,
if you mean the FIG.68 in VHF/UHF manual (page 8.28), I can't see something
wrong.
I have made this system a few years ago and I did not notice any problem.
Position 5 for RHCP has a Matching stub (L/4 75 Ohm) in series with 135'
Yagi and
a Matching stub (L/4 75 Ohm) + a Phasing-stub (L/4 50 Ohm) in series with
45' Yagi.
Position 6 for LHCP: a Matching stub (L/4 75 Ohm) + a Phasing-stub (L/4 50
Ohm)
in series with 135' Yagi and a Matching stub (L/4 75 Ohm) in series with
45' Yagi.
Where is the L/2 (as you pointed out) ??? I can't see it.
The 135' Yagi on LHCP is fed with 2 stubs in series,
but the first one is L/4 50 Ohms and acts as "Phasing stub" and the second
is L/4 75 Ohms "Matching stub". They have different "Z" each one, so
there are not 2 pieces L/4 50 Ohms = L/2 50 Ohms.
73, Mak SV1BSX
----- Original Message -----
From: "Angus" <angus(AT)young5769.freeserve.co.uk>
To: <amsat-bb(AT)amsat.org>
Sent: Wednesday, August 06, 2008 6:06 PM
Subject: [amsat-bb] Re polarity control box - again
> Hi all, its me again, sorry.
> OK got the 2mtr polarity control box working and very pleased, except for
> one very small item.
> LHCP never seemed to me to be 90 degrees out of phase with RHCP, never had
> the large drop in signal I expected.
> OK time for a bit or research and looked in to my VHF/UHF manual and found
> the pages and guess what, the design we have been using is wrong, or so I
> think, please correct me if I am wrong.
> OK both yagis have a 1/4 wave 75 ohm matching system to allow the system
> back to work with 2 x 50 ohm yagis in parallel, in case anyone forgets, so
> for Vertical both yagis fed in phase, for Horizontal the 135 degrees yagi
> is fed with a 1/2 wave of 50 ohm line to delay it by 180 degrees, no
> problems so far.
> For RHCP the 45 degrees yagi is fed with a 1/4 wavelength of 50 ohm delay
> line and again no problems.
> NOW HERE'S THE RUB!
> For LHCP we feed the 135 degrees yagi with a 1/4 wavelength of 50 ohm
> line, woops the system has a 1/2 wavelength of 50 ohm line!
> So instead of feeding as we should we are feeding it to make it simpler
> than it should be. Hence I was never happy that LHCP was never quite 90
> degrees out with RHCP.
> So quite possibly we are going to get some form of strange oval type of
> polarity anyone take a guess at its true nature, I may have a play around
> with one of the antenna programs and see what comes out.
> Am I wrong completely on this or is it the better to have it off a little
> on LHCP to get the other 3 polarities correct?
> Sorry for boring some of you.
> regards
> Gus M0IKB
> _______________________________________________
> Sent via AMSAT-BB(AT)amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 5
Date: Wed, 6 Aug 2008 12:53:38 -0400
From: "David J" <n4csitwo(AT)bellsouth.net>
Subject: [amsat-bb] Re: Th-D7A(G) & HMC-3
To: "Jeff Yanko" <wb3jfs(AT)cox.net>, <amsat-bb(AT)amsat.org>
Message-ID: <004d01c8f7e4$f99f9b10$0202a8c0(AT)DHJ>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Jeff,
I use it a lot. What do you need to know?
Dave, AA4KN
----- Original Message -----
From: "Jeff Yanko" <wb3jfs(AT)cox.net>
To: <amsat-bb(AT)amsat.org>
Sent: Wednesday, August 06, 2008 6:28 AM
Subject: [amsat-bb] Th-D7A(G) & HMC-3
> Hi all,
>
> Just wondering if anybody on the BB is using the combination of the
> TH-D7A(G) and the HMC-3 headset? I have a few questions to ask about this
> setup.
>
> 73,
>
> Jeff WB3JFS
>
>
>
> _______________________________________________
> Sent via AMSAT-BB(AT)amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 6
Date: Wed, 6 Aug 2008 18:10:27 +0100
From: "Angus" <angus(AT)young5769.freeserve.co.uk>
Subject: [amsat-bb] re Polarity control box - again
To: <amsat-bb(AT)amsat.org>
Message-ID: <1507C43C0A604EBBBFDF443EECE0D92D(AT)GusPC>
Content-Type: text/plain; charset="iso-8859-1"
Hi Mak, thanks for reply.
The problems occur when we go and try and make the polarity control unit
remote controlled. I have a fully working manual unit here in the shack and is
100% fine.
However the remote unit I built use's relays to add in extra lengths of 50ohm
coax as a delay line (a 1/4 wave on the -45degree yagi, and a 1/2wavelength on
the +45degree yagi.)
This system I have seen used by very many operators and also some comercial
units, however with just the 2 delay lines the LHCP will never really be LHCP,
it needs an extra set of relays to switch in the other 1/4wave delay line.
I was just wondering if anyone else had seen this or have I just misunderstood
the circuit somehow.
Any thoughts would be appreaciated.
regards
Gus M0IKB
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------------------------------
_______________________________________________
Sent via amsat-bb(AT)amsat.org. Opinions expressed are those of the author.
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End of AMSAT-BB Digest, Vol 3, Issue 397
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