144XV construction experience?

[Allan Taylor]

I am about to begin the build of a 144XV transverter. Before I venture
forth,
though, I would like to request the advice of those here who have built this
2m transverter. Any specific warnings that apply to it?   I have just
completed
the install of the K60XV mod / kit so that work on the K2 is already done.

--
73     Allan    K7GT
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[Don Wilhelm-4]

Follow the instructions in the manual and you will be successful. Do the
steps in order.
Do not mix up the shielded inductors is the only specific warning that I
can offer.  I have built many of the XV transverters.

73,
Don W3FPR

On 12/27/2013 9:55 AM, Allan Taylor wrote:
> I am about to begin the build of a 144XV transverter. Before I venture
> forth,
> though, I would like to request the advice of those here who have built this
> 2m transverter. Any specific warnings that apply to it?   I have just
> completed
> the install of the K60XV mod / kit so that work on the K2 is already done.
>

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[Lloyd Korb-3]

Allan,

I am in the process of building the 222 version.  Just a word of warning
that I received in an email from Elecraft.  Now, the caution about
disconnecting the antenna when transmitting close to the 222 antenna is
going to be a real PITA when working the contests!  Removing during
lightning storms is a no brainer!

73,  Lloyd  K8DIO





*One tip:The RF module usually has a depression in the middle, so if you
trim the thermal pad with scissors so it just fits within that depression,
it makes for a better clamping and improved heat transfer. Do not exceed
20w of RF output, and disconnect the antenna when lighting storms approach
or if you will be transmitting close to the XV222 antenna with another rig.*

On Fri, Dec 27, 2013 at 11:11 AM, Don Wilhelm <[hidden email]> wrote:

> Follow the instructions in the manual and you will be successful. Do the
> steps in order.
> Do not mix up the shielded inductors is the only specific warning that I
> can offer.  I have built many of the XV transverters.
>
> 73,
> Don W3FPR
>
>
> On 12/27/2013 9:55 AM, Allan Taylor wrote:
>
>> I am about to begin the build of a 144XV transverter. Before I venture
>> forth,
>> though, I would like to request the advice of those here who have built
>> this
>> 2m transverter. Any specific warnings that apply to it?   I have just
>> completed
>> the install of the K60XV mod / kit so that work on the K2 is already done.
>>
>>
>  ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

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[Don Wilhelm-4]

That caution is not restricted to the Elecraft XV series transverters,
but is appropriate for any receiver that uses sensitive devices for the
receiver front end.  The XV series uses the AT F 34143 for the preamp
front end.  Yes, that is a sensitive device that can be damaged by high
RF input.  It is prudent to use means to protect that front end from
excessive RF from other nearby transmitters whether that be an Elecraft
product or any other brand.

73,
Don W3FPR

On 12/27/2013 4:23 PM, Lloyd Korb wrote:
> Allan,
>
> I am in the process of building the 222 version.  Just a word of warning
> that I received in an email from Elecraft.  Now, the caution about
> disconnecting the antenna when transmitting close to the 222 antenna is
> going to be a real PITA when working the contests!  Removing during
> lightning storms is a no brainer!
>
>

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[Edward R Cole]

I have preamps on multiple VHF and UHF antennas on the same tower
mast.  All preamps are powered off together by a master sequencer so
if I transmit on one band all others are off.  The TR relays also are
switched at the same time disconnecting all preamps from their
antennas when any one band is in transmit.

Exception are the HF antennas and two VHF antennas that are used on
FM (only one has an in-line preamp which is RF switched).  I run
1300w on the eme array (ERP=135 kW) which is about 130-feet away with
no issues observed.  The two antennas point at each other when the
Moon is in a particular position (az=235) but Moon is usually
elevated above the FM antenna (a yagi) by about 30-degrees so RF is
down about 25-dB in the direction of the FM antenna.  Space loss for
130-feet lowers RF to a non-damaging level for receiving devices
(which I consider < 0 dBm).

Interestingly, the personnel RF safe zone on-axis for the 2m eme
signal is 75.52m (247-feet).  But it is safe at head height directly
under the  eme tower which is 13.7m (50-foot).  I would not transmit
when anyone climbed the other tower.
A very nice program called EMRCalc is available from VK3UM to
evaluate RF safety zones from your antenna.

73, Ed - KL7UW

-----------------------
From: Don Wilhelm <[hidden email]>
To: [hidden email]
Subject: Re: [Elecraft] 144XV construction experience?
Message-ID: <[hidden email]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

That caution is not restricted to the Elecraft XV series transverters,
but is appropriate for any receiver that uses sensitive devices for the
receiver front end.  The XV series uses the AT F 34143 for the preamp
front end.  Yes, that is a sensitive device that can be damaged by high
RF input.  It is prudent to use means to protect that front end from
excessive RF from other nearby transmitters whether that be an Elecraft
product or any other brand.

73,
Don W3FPR



73, Ed - KL7UW
http://www.kl7uw.com
     "Kits made by KL7UW"
Dubus Mag business:
     [hidden email]

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