[Moon-net] Moon-net Digest, Vol 74, Issue 2

Tue Dec 5 14:49:57 CST 2006

Hello Sven.  Rs parts usa has them. i has bye some in dayton ohio with them 
regards from oz8afc palle
----- Original Message ----- 
From: <moon-net-request at list-serv.davidv.net>
To: <moon-net at list-serv.davidv.net>
Sent: Tuesday, December 05, 2006 7:00 PM
Subject: Moon-net Digest, Vol 74, Issue 2


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> Today's Topics:
>
>   1. Arc-overs in a PCB on 2320MHz (Koellner, Guenter)
>   2. MGF1302 and MGF1402 (SM5LE)
>   3. K8TQK is looking for 144 qs at my moon set (k8tqk)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 5 Dec 2006 08:55:29 +0100
> From: "Koellner, Guenter" <guenter.koellner at siemens.com>
> Subject: [Moon-net] Arc-overs in a PCB on 2320MHz
> To: <Moon-net at list-serv.davidv.net>
> Message-ID:
> <A159E179DBE32449A10A3A2CB89161F1018EFE73 at MCHP7R5A.ww002.siemens.net>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hello,
>
> maybe some of you can give me some advise...
>
> On 13cm, I am running two of the well known Ericsson (or was it Nokia?) 
> modules. You can see those on this web page:
> http://sk0ct.se/2g3pa/2g3pa.htm
> My coupler is different, but professionally made and working fine.
>
> My problem is that at the output of the modle, about where you can see the 
> semi regid connected in the pictures, I am getting arcs through the PCB to 
> the ground plane caused by excessive RF field. While transmitting, you can 
> really see them, and I even saw the solder melting there. The PCB is 
> 0.65mm thick and the stripline 4mm wide. Due to these arcs, the PCB 
> becomes carbonized, which is afterwards like a ground short at that point. 
> Luckily the MRF21120 are safe against the worse return loss, so I never 
> damaged one due to this.
> The total output power is about 200W, so I assume having a little more 
> than 100W on each module. I am operating the units in a rain-dry cupboard 
> behind my dish, so environmental conditions are "outside" ones.
>
> When this happend first, I cut away the carbonized piece (about 3mm wide x 
> 5mm long) of the module's PCB and replaced it by a piece of insulation and 
> a copper foil. But meanwhile another arc over happend at the inner end of 
> my cutaway, and the 2nd module had an arcover at its originally kept 
> output, too.
>
> I already thought about replacing the stripline with semi rigid. I roughly 
> calculated the impedance to be about 20Ohms due to the mechanical 
> dimensionsions. So I probably can use two 50Ohm SR in parallel if these 
> can withstand the power much better.
>
> I also had a talk with the developer of the UMTS amps in my company, he 
> also mentioned that they know about such problems.
>
> What would you do in my case? Is it a good solution to replace the 
> stripline with two 50Ohm semi rigid lines in parallel or any other hints?
>
> 73, G?nter, DL4MEA
>
>
>
>
>
> ------------------------------
>
> Message: 2
> Date: Tue, 5 Dec 2006 11:33:40 +0100
> From: "SM5LE" <sm5le at telia.com>
> Subject: [Moon-net] MGF1302 and MGF1402
> To: "MOON_NET" <moon-net at list-serv.davidv.net>
> Message-ID: <000801c71858$d4cc0e80$e201ec51 at svened25a570e4>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi all
>
> Where can I buy small quantities (#10) of MGF1302 or MGF1402 (or 
> equivalent) ?
>
> They are needed for repairing an old construction.
>
> Super tnx.
> Sven SM5LE
>
>
>
> ------------------------------
>
> Message: 3
> Date: Tue, 05 Dec 2006 07:16:58 -0500
> From: k8tqk <k8tqk at horizonview.net>
> Subject: [Moon-net] K8TQK is looking for 144 qs at my moon set
> To: Moon-net at list-serv.davidv.net
> Message-ID: <5.2.0.9.2.20061205071142.009fcec0 at mail.horizonview.net>
> Content-Type: text/plain; charset=us-ascii; format=flowed;
> x-avg-checked=avg-ok-44A42DC3
>
> Hi all,
>
> I am still looking for 6's,7's and VE'S qs on 144 for CSVHFS states above
> 50mhz award.  I have 750wts and 2x 5wls .
> I can only see moon set.  My grid is: em89je...
> Any cw skeds on 144, would be great...
> tnx
>
> 73 Bob K8TQK
> em89je Bainbridge, Ohio 45612
> qrv 50m-10gigs...
>
>
>
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> End of Moon-net Digest, Vol 74, Issue 2
> ***************************************