[TenTec] OT: Holiday SDR Project

[George Fritkin via TenTec]

It depends on xcvr

George, W6GF

Sent from my iPad

> On Nov 9, 2014, at 12:12 PM, Carl Moreschi <n4py3 at 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 at 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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