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Re: [TenTec] OT: Holiday SDR Project

To: "n4py3@earthlink.net" <n4py3@earthlink.net>, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] OT: Holiday SDR Project
From: George Fritkin via TenTec <tentec@contesting.com>
Reply-to: George Fritkin <georgefritkin@yahoo.com>, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sun, 9 Nov 2014 13:58:21 -0800
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
It depends on xcvr

George, W6GF

Sent from my iPad

> On Nov 9, 2014, at 12:12 PM, Carl Moreschi <n4py3@earthlink.net> wrote:
> 
> If you energize the relay with the amp key line, it will energize before RF 
> is generated.
> 
> Carl Moreschi N4PY
> 58 Hogwood Rd
> Louisburg, NC 27549
> www.n4py.com
> 
>> On 11/9/2014 1:44 PM, George Fritkin via TenTec wrote:
>> Yes, and if the relay is not fast enough, you will TX RF right into the 
>> receiver.  It may be momentary, but still potentially dangerous.  The DX 
>> Engineering RTR does not have the problem
>> 
>> George, W6GR
>> 
>> Sent from my iPad
>> 
>>> On Nov 9, 2014, at 10:29 AM, Don Rasmussen via 
>>> TenTec<tentec@contesting.com>  wrote:
>>> 
>>> Carl, Is there a document for the mod anywhere? Photo, etc.
>>> 
>>> =================================================
>>> 
>>> The MFJ 1708 schematic shows the relay in the transmit position which is 
>>> contrary to what it says in the diagram. Without the jumper, in receive 
>>> only the panadapter receiver would be connected to the antenna, not the 
>>> transceiver. Adding the jumper between the antenna and transceiver causes 
>>> the transceiver to be always connected to the antenna which is exactly what 
>>> you want. In transmit, the relay still grounds the panadapter antenna and 
>>> removes it from the antenna which again is exactly what you want.
>>> 
>>> Carl Moreschi N4PY
>>> 58 Hogwood Rd
>>> Louisburg, NC 27549
>>> www.n4py.com
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