A good Grid Dip ........ look for a good old " Boonton " in surplus.
MFJ as a grid dip, it works, but it does'nt show the deep sharp dips ( Tom
explained why ) one would expect comparing with our good old triode dip
meters.
Jos on4kj
----- Original Message -----
From: "Robert Shohet" <kq2m@earthlink.net>
To: <towertalk@contesting.com>; <W8JI@contesting.com>; "Dale L Martin"
<kg5u@hal-pc.org>
Sent: Wednesday, August 04, 2004 5:19 AM
Subject: Re: [TowerTalk] Grid dip meter and Yagi elements
> Hi Dale,
>
> Tom nailed it when he said to buy a real GDO. Years ago,
> I also bought the MFJ "plug-in" for the purpose of tuning
> and cutting 1/4 wave coax stubs. This purchase was based on
> the MFJ tech's claim that it worked great for him on Coax - but he lied!
> Yep,
> he cited the ARRL article as "proof" of how well it worked.
>
> After I couldn't get it to work, I called the tech
> and held his feet to the fire - finally he 'fessed up - he then changed
> his story from saying that he used it himself with coax, to based
> on the ARRL article, he THOUGHT it SHOULD work with coax.
>
> But then he (the tech) refused to take the product back for a refund!
> I appealed to Tom, W8JI and being the gentleman that he is, Tom
> personally sent it back and requested the refund on my behalf.
>
> It took SIX weeks and FOUR unanswered follow-up telephone calls
> to receive a refund, and then MFJ refused to refund the $6.00 UPS
> charge that I paid to get the plug-in. that was bought on the
recommendation
> of the MFJ tech who had lied about how well he had seen it work with coax!
>
> Morals of the story:
>
> 1) If it is an MFJ product that you are thinking of buying and you
> want the TRUTH about how well it works (or doesn't), ask W8JI.
>
> 2) Buy good quality equipment to properly measure whatever it is
> you need to measure.
>
> 73
> Bob KQ2M
>
> ----- Original Message -----
> From: "Dale Martin" <kg5u@hal-pc.org>
> To: <towertalk@contesting.com>
> Sent: Tuesday, August 03, 2004 10:25 PM
> Subject: RE: [TowerTalk] Grid dip meter and Yagi elements
>
>
> >
> > > I am assuming you guys talking about "grid dip meters" are not really
> > > talking about these old devices. What is the modern equivalent?
> > > I have an
> > > MFJ 259B, for instance. It is easy to get the resonant frequency
> > > of a yagi
> > > element split and insulated in the middle. Can I use it to
inductively
> > > couple to a continuous yagi element or otherwise determine that
> element's
> > > resonant frequency in any way?
> > >
> >
> > Mark,
> >
> > I've got a B&W grid dip meter which uses external coils of various sizes
> to
> > inductively couple with the 'load' in question. It works great. I've
> used
> > it a couple of times to evaluate the traps of Cushcraft A3's. I found
> that
> > MFJ has (or had) an optional plug-in for the MFJ-259 which allows it to
> act
> > as a GDM.
> >
> > I'll be happy to send you my plug-in and if you want to give it a try.
> >
> > It didn't work worth beans when I was testing traps.
> >
> > 73,
> > dale, kg5u
>
>
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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