I fully confess to having the bug, drinking the Kool-Aid, and jumping on the
couch. I'd ask about a cure, but I'm having way too much fun!
Les Rayburn, director
High Noon Film
100 Centerview Drive Suite 111
Birmingham, AL 35216-3748
205.824.8930
205.824.8960 fax
205.253.4867 cell
--------------------------------------------------
From: "George Sintchak/WA2VNV" <wa2vnv@optonline.net>
Sent: Friday, July 11, 2008 11:10 PM
To: <wa4kxy@bellsouth.net>; "'Les Rayburn'" <les@highnoonfilm.com>; "'Stan,
W1LE'" <stanw1le@verizon.net>; "'VHF Contesting Reflector'"
<vhfcontesting@contesting.com>; <vhf@w6yx.stanford.edu>
Subject: Re: [VHFcontesting] [VHF] Antenna Coupling Issues
> Jim - you're right on the money. Les has the disease and just doesn't know
> it yet - still in denial, as you said.
>
> YMMV, keep on trukin' Les.
>
> 73's,
> George
> P.S. I don't thnk 2304 will work very well from inside the attic. Much
> better on your future new rover vehicle !!!
>
> ----- Original Message -----
> From: "Jim Worsham" <wa4kxy@bellsouth.net>
> To: "'Les Rayburn'" <les@highnoonfilm.com>; "'Stan, W1LE'"
> <stanw1le@verizon.net>; "'VHF Contesting Reflector'"
> <vhfcontesting@contesting.com>; <vhf@w6yx.stanford.edu>
> Sent: Friday, July 11, 2008 10:45 PM
> Subject: Re: [VHFcontesting] [VHF] Antenna Coupling Issues
>
>
> The DCI filters work well. We use them at W4NH on all of the bands from 6
> through 432. Famous last words on that TX power. I started on just 6 and
> 2
> meters with 100 Watts. I thought the same thing. You don't even want to
> know what I have now and have spent on this stuff since then. The first
> time you try to make a Q and just miss the other guys call or grid or he
> misses yours it will drive you insane. Frankly, you already have the
> disease but you are in denial. How much stuff have you bought in just the
> past few months (we have all been watching you with a knowing smile on our
> faces!) and now you want to buy DCI filters (which we know are not cheap).
> I predict the antennas in the attic will not last a year. I predict you
> will be buying some property someplace or a big vehicle to mount antennas
> and go roving before long.
>
> 73
> Jim, W4KXY
>
> -----Original Message-----
> From: vhfcontesting-bounces@contesting.com
> [mailto:vhfcontesting-bounces@contesting.com] On Behalf Of Les Rayburn
> Sent: Friday, July 11, 2008 2:43 PM
> To: Stan, W1LE; VHF Contesting Reflector; vhf@w6yx.stanford.edu
> Subject: Re: [VHFcontesting] [VHF] Antenna Coupling Issues
>
> Along with Stan, several folks have mentioned using tight bandpass filters
> on both TX and RX. I looked over DCI's filters today, and saw a few that
> might fit the deal. I'm curious has to what others are using.
>
> The bandpass filter option appeals to me as I think it would provide the
> added benefit of reducing my interference levels, and providing some
> additional protection for the pre-amps and front ends. I can't imagine
> that
> I'm ever going to even seriously consider running more than 200-300 watts
> on
>
> any band given the indoor antennas. It will be easy to become an
> "alligator"
>
> and certainly will only cause issues with TVI/RFI, including the potential
> to interfere with the President of the HOA who lives next door.
>
> So, sources? Prices? Anything to avoid?
>
> 73,
>
>
> Les Rayburn, director
> High Noon Film
> 100 Centerview Drive Suite 111
> Birmingham, AL 35216-3748
> 205.824.8930
> 205.824.8960 fax
> 205.253.4867 cell
>
> --------------------------------------------------
> From: "Stan, W1LE" <stanw1le@verizon.net>
> Sent: Friday, July 11, 2008 11:08 AM
> To: "Les Rayburn" <les@highnoonfilm.com>
> Subject: Re: [VHF] Antenna Coupling Issues
>
>> Hello Les, My comments are added.....
>>
>>
>> Les Rayburn wrote:
>>> 1. At what power levels (typically) does this begin to be an issue?
>>>
>> Too many variables that need controlling to comment, you are on thin ice.
>> destruct level of the preamplifier,
>> preamp isolation (filtering) for out of band signals,
>> TX power levels,
>> quality of coax being used, braided shields leak, solid shields like
>> solid
>
>> copper on superflex or hardline are betrter,
>> Bypass relay isolation,
>> antenna proximity, near filed issues.
>> polarizations used,
>> Coaxial cable losses,
>> etc.
>> etc.,
>>
>>> 2. Are there steps that I can take to minimize the coupling, and protect
>>> the
>>> pre-amps and radios?
>>>
>> Coupling is proximity. Either I disable all preamplifiers not used,
>> except
>
>> for the band I am playing on or
>> I have tight bandpass filters and leave the preamp on for other RX bands.
>> Tight bandpass filters for RX AND TX.
>> Another alternative is to disable all preamps on ALL bands, when I
>> transmit on any band. including HF.
>>
>> All preamplifiers default to a bypass mode, when the system is not used.
>>> 3. What do rovers in similar situations do to prevent problems?
>>>
>>
>> Rovers usually go thru a few preamplifiers until they take the previously
>> mentioned actions.
>>
>>
>> Stan, W1LE Cape Cod
>>
>>
>>
>>
>> ZZZZZz
>>>
>>>
>>>
>>
>>
>
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