Well considering these comments about the diamond antennas what kind of 
antenna can I build that will meeet these goals.

1. totally enclosed in pvc pipe
high gain - about 6dB on 2m and 8 to 9dB on 70cm
length less than 12 feet long
a jpole creates a pvc covering issue for the first two foot or so where the 
j is located


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From: "John Miller" <[log in to unmask]>
Sent: Tuesday, April 28, 2015 4:54 PM
To: <[log in to unmask]>
Subject: Re: plans for high gain 2m 70cm antenna

> I've pulled a couple of them apart as well, let's put it this way, I'll
> gladly build my antennas. J-poles, dipoles, easy verticals and even on up 
> to
> I want to build a hex beam someday just so I can say I did. I've rebuilt 
> my
> 2 meter beam and have full confidence I could build my next one from 
> scratch
> and even make changes to make it go to 70 CM, 900 MHz, 220, maybe even 6
> meters or all the way down to 20. The X200 and I assume the 300 is the 
> same,
> is a pretty complex antenna in all the coils and what not and having seen
> that I'm not sure how they work as well as they do without much if any
> trouble. I wouldn't want to build one.
> ----- Original Message ----- 
> From: "Colin McDonald" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Tuesday, April 28, 2015 4:33 PM
> Subject: Re: plans for high gain 2m 70cm antenna
>
>
>> I've pulled a couple of these apart.
>> There are multiple matching coils, loading coils and various element
>> arrangements all the way up the antenna.
>> It's not a simple thing to build.
>> far easier to build a yaggie or quad for those bands.
>> I expect it would also be more expensive to build something like the
>> x200/300 as well than it is to buy one.
>>
>> 73
>> Colin, V A6BKX
>> -----Original Message----- 
>> From: Neil k8it
>> Sent: Tuesday, April 28, 2015 2:24 PM
>> To: [log in to unmask]
>> Subject: Re: plans for high gain 2m 70cm antenna
>>
>> I have been thinking of building a base station 2m and 70cm antenna. I
>> like
>> the diamond x-200a or x-300a designs but would like to try building one
>> myself. the antennas are rated at 6 to 6.5 dB on 2m and 8 to 9.5 dB on
>> 70cm.
>> But does anybody have dimensions of this type of antenna? I found several
>> J-pole designs but no 5/8 wave collinear designs with radials similar to
>> the
>> Diamond x-200A or x-300A antennas.
>> Anybody have any thoughts?
>>
>> Would a 8 foot center element (two 5/8 waves in series simply work? would
>> it
>> match to 50 ohm coax? will it match on 70cm?
>>
>> thanks
>> 73 Neil k8it
>
>
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