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SDARC Forum http://www.sdarc.net/forum This is an XML content feed of; SDARC Forum : Last 10 Posts Copyright (c) 2006 Web Wiz Forums - All Rights Reserved. Fri, 04 Jul 2008 13:14:33 +0000 Fri, 27 Jun 2008 00:42:08 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 8.04 30 www.sdarc.net/forum/RSS_topic_feed.asp SDARC Forum http://www.sdarc.net/forum/forum_images/web_wiz_forums.png http://www.sdarc.net/forum contesting : VHF NFD Registration http://www.sdarc.net/forum/forum_posts.asp?TID=754&PID=2236#2236 Author: M0ACM
Subject: VHF NFD Registration
Posted: 27 June 2008 at 12:42am

Clap

Thanks to all the context 'regulars' at Club this evening for Rallying around on the Contest planning.
Particular thanks for additional input this evening from Chris AJA, Liam and John for offering hardware and help with transport which we all know will be tight this time.

Any further constructive ideas, please feel free to add them in.....

... also if you can choreograph a dance that guarantees to induce Sporadic E in the right place on the weekend concerned (while we are pointing in the right direction and all fired up), Dave XUK promises to perform it !!

]]> Fri, 27 Jun 2008 00:42:08 +0000 http://www.sdarc.net/forum/forum_posts.asp?TID=754&PID=2236#2236 for sale/wanted : MQ-1 Mini Beam http://www.sdarc.net/forum/forum_posts.asp?TID=755&PID=2235#2235 Author: Steve
Subject: MQ-1 Mini Beam
Posted: 25 June 2008 at 2:25pm

NOW SOLD Thanks for use of Forum

Not had this up long and miserable neighbours are complaining already.

So to keep the peace I'm letting it go.

TGM MQ-1, 2element Four band Hybrid Quad antenna. Covers 6/10/15 &20M, I also have a good quality current balun which fits to the feedpoint of the beam.
I am second owner but its in good condition, only very slightly weathered.

Dismantled part way (can be dismantled farther) so its easy to set it back up. Will fit in estate car or on a roof rack.

Looking to swap for something radio related, and buyer will need to collect due to size.
Located near Swindon, Wiltshire

Picture of Beam
http://www.m3wbs.radio.btinternet.co.uk/bits/MQ-1-3.jpg

Edited by Steve - 28 June 2008 at 9:00pm]]> Wed, 25 Jun 2008 14:25:28 +0000 http://www.sdarc.net/forum/forum_posts.asp?TID=755&PID=2235#2235 technical topics : Rotator Query http://www.sdarc.net/forum/forum_posts.asp?TID=741&PID=2234#2234 Author: m0xuk
Subject: Rotator Query
Posted: 25 June 2008 at 8:52am

All I'll say is P=VI, V=IR. Cap is probably rated at 50V. If you are using an swr meter you will know if it is burnt out! Cheaper having one of those than burning out the PA in your transceiver.
And yes it is 144.3....
]]> Wed, 25 Jun 2008 08:52:24 +0000 http://www.sdarc.net/forum/forum_posts.asp?TID=741&PID=2234#2234 technical topics : Rotator Query http://www.sdarc.net/forum/forum_posts.asp?TID=741&PID=2233#2233 Author: nick
Subject: Rotator Query
Posted: 24 June 2008 at 11:15pm

Unfortunately that little tiny PCB-style capacitor trimmer is now 34-foot in the air. How am I supposed to adjust it? Will a tiny trimmer take 50-Watts of VHF? I assume I've already burnt it out, I attempted to answer a CQ...

See my shiny new thing at www.pettefar.eu/m0NjP/Aerials-June-2008

Is the SSB 2-metre calling frequency 144,300 Mc/s ?

CQ CQ CQ CQ Mike Zero November Julia Papa calling CQ ...... hiss, crackle and pop ....... Whirrrrr]]> Tue, 24 Jun 2008 23:15:25 +0000 http://www.sdarc.net/forum/forum_posts.asp?TID=741&PID=2233#2233 technical topics : Rotator Query http://www.sdarc.net/forum/forum_posts.asp?TID=741&PID=2232#2232 Author: m0xuk
Subject: Rotator Query
Posted: 24 June 2008 at 6:15pm

As James says, that capacitor will be part of a matching network.You need to transmit through an swr meter and tune for best swr.
I wouldn't be too bothered about a small amount of play on a cheap rotator.
PS trying to tune for maximum smoke on a strong FM signal is useless - find a weak ssb or cw signal (such as a beacon) and you'll surely see the difference then. Assuming the cap isn't burnt out that is...
]]> Tue, 24 Jun 2008 18:15:24 +0000 http://www.sdarc.net/forum/forum_posts.asp?TID=741&PID=2232#2232 technical topics : Rotator Query http://www.sdarc.net/forum/forum_posts.asp?TID=741&PID=2231#2231 Author: nick
Subject: Rotator Query
Posted: 24 June 2008 at 5:53pm

Hi, thanks for the reply!

Sorry for not expressing myself sufficiently. What I mean by wobble is that I can wobble the pole coming from the top of the rotator a bit. When it's rotating it is fine but there is some play in the mechanism. The mechanism and the rotator itself all appear brand new. It's a Yamato YS-130 which gets good reviews on the interweb.

The little capacitor trimmer really is a little capacitor, such as you would find on a PCB of a transistor receiver. I think I will just remove it.]]> Tue, 24 Jun 2008 17:53:52 +0000 http://www.sdarc.net/forum/forum_posts.asp?TID=741&PID=2231#2231 technical topics : Rotator Query http://www.sdarc.net/forum/forum_posts.asp?TID=741&PID=2230#2230 Author: M1DST
Subject: Rotator Query
Posted: 24 June 2008 at 5:43pm

Depends what you mean by wobble. I would say no as even with cheap ones I have not seen wobble. Is your pole bent?

Have you checked the impedence of the antenna? Is it measuring 50-ohms? My guess is the trimmer is part of the matching network. Check the amount of power that trimmer can handle too.
]]> Tue, 24 Jun 2008 17:43:52 +0000 http://www.sdarc.net/forum/forum_posts.asp?TID=741&PID=2230#2230 technical topics : Rotator Query http://www.sdarc.net/forum/forum_posts.asp?TID=741&PID=2229#2229 Author: nick
Subject: Rotator Query
Posted: 24 June 2008 at 4:55pm

Two more questions from the 2-metre and rotator newbie:

1) There is a little bit of wibble-wobble in the rotator, is that normal?

2) Pending completion of my own Yagi, I purchased a used four-element one from eBay. Inside the connection compartment is a little trimmer capacitor and the instructions say to turn it for maximum effect. I have tried this and it doesn't seem to effect reception at all. It also looks a bit fragile and damaged. Can I just get rid of it do you think? I am using 50-ohm feeder co-ax and no ATU.

I heard someone last night discussing electricity pylons and neon lamps and stuff VERY LOUDLY on FM whilst fiddling with this stuff last night so I guess it's working...]]> Tue, 24 Jun 2008 16:55:34 +0000 http://www.sdarc.net/forum/forum_posts.asp?TID=741&PID=2229#2229 contesting : VHF NFD Registration http://www.sdarc.net/forum/forum_posts.asp?TID=754&PID=2228#2228 Author: Bob G0VTA
Subject: VHF NFD Registration
Posted: 24 June 2008 at 11:11am

Regret I shall not be around to transport the generator up the hill on this occasion. Bob]]> Tue, 24 Jun 2008 11:11:49 +0000 http://www.sdarc.net/forum/forum_posts.asp?TID=754&PID=2228#2228 contesting : VHF NFD Registration http://www.sdarc.net/forum/forum_posts.asp?TID=754&PID=2227#2227 Author: G4LDL
Subject: VHF NFD Registration
Posted: 24 June 2008 at 9:57am

James, seems sensible to me as I understand resources are tight. Wish I was here to watch you all manhandling the tower and trailer up that hill!!!

Hope all goes well. Tony G4LDL

]]> Tue, 24 Jun 2008 09:57:18 +0000 http://www.sdarc.net/forum/forum_posts.asp?TID=754&PID=2227#2227