DX Engineering has products for this
George, W6GF
Sent from my iPad
> On Nov 8, 2014, at 7:42 PM, Rick - DJ0IP / NJ0IP <Rick@DJ0IP.de> wrote:
>
> That is a very good tip, Carl.
> Reminds me of the old Johnson T/R switch I used 50 years ago (hi).
>
> My only comment is, one should absolutely NOT use the RF sense for switching
> when working in CW.
> That could end up being too slow and blow the 2nd RX.
>
> It is fine for SSB using PTT.
> Not sure how it would be using SSB and VOX.
> I guess that would depend on how loud you say your first "uuuhhh".
>
> With any of the late model Ten-Tec transceivers (ORION, OM7, Eagle), the
> delay after keying the PTT is plenty long to allow the 1708 to switch.
>
> 73 - Rick, DJ0IP
> (Nr. Frankfurt am Main)
>
> -----Original Message-----
> From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Carl
> Moreschi
> Sent: Sunday, November 09, 2014 4:26 AM
> To: Don Rasmussen; Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] OT: Holiday SDR Project
>
> What radio are you using? Many radios have an easy way to share antennas.
> If that's not an easy solution then the MFJ1708 can do the job. See below.
>
> The solution to share antennas is to add an MFJ-1708 T/R switch. This
>
> unit will automatically sense RF from the transmitter and then remove
>
> the panadapter radio from the receive antenna connection. But the MFJ
>
> switch will also remove the transceiver from the transmit connection
>
> while in receive. So the MFJ switch needs a very simple mod. You
>
> must solder a 14 gauge wire between the transmit and antenna SO-239
>
> connections. This will then make the switch operate properly for this
>
> use. Additionally, you can wire the relay to energize from your
>
> radio's amp key line for faster and safer switching.
>
>
>
> Carl Moreschi N4PY
> 58 Hogwood Rd
> Louisburg, NC 27549
> www.n4py.com
>
>> On 11/7/2014 5:45 PM, Don Rasmussen via TenTec wrote:
>>
>>
>> That sounds great Carl, the transceiver and SDR can both be tuned by the
> main tuning knob of the transceiver.
>>
>> Anyone have suggestions on sharing the antenna?
>>
>> The second receiver needs to have it's input grounded before the
> transceiver puts RF on the line.
>>
>> =======================================================
>>
>> That will work well for you. My N4PY software can provide everything you
> need to keep the softrock and your transceiver on the same frequency.
>> Carl Moreschi N4PY
>> 58 Hogwood Rd
>> Louisburg, NC 27549
>> www.n4py.com On 11/5/2014 11:34 AM, Don Rasmussen via TenTec wrote:
>> After all this talk about the new Flex Series and peripherals it seems
>> all of my objections have melted away except for the oldest one -
>> cost! Flex 6300 with FX-PAD and TMate2 are outside of my ham radio
>> budget but only because I have that amount of money tied up in
>> existing gear that I enjoy. I did decide to take a look at what Tony
>> Parks has been up to and found a very inexpensive SDR project for the
>> holidays. I can enjoy the build and then mess with the software. The
>> 1.8-30Mhz receiver is $68 and the option cabinet is $20.
>> http://tinyurl.com/qx4ha8p
>> _______________________________________________
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