Array Solutions makes a rx front end protector for just this reason. I
separated my K9AY loops the recommended amount from my F12 Sigma 80, but it
isn't enough. So I added this to my O2 rx antenna input. I still can't run 1500
W when the main lobe of the loops point at the Sigma 80 because enough RF gets
into my O2 to cause keying problems, but the RF voltage at the external rx
terminals is greatly reduced such that my O2 doesn't lock-up.
Kim N5OP
"People that make music together cannot be enemies, at least as long as the
music lasts." -- Paul Hindemith
> On Jan 15, 2015, at 16:07, "Rick - DJ0IP / NJ0IP" <Rick@DJ0IP.de> wrote:
>
> Yes agree. But one mistake and the front end of the RX is shot.
> The Ten-Tec mod that installs two jacks to the rear panel and runs this line
> out (and back in), clearly warns not to use this as an RX ANT in,
> connection.
>
> Never-the-less, Bob and I have both done this, but we both used a protection
> relay (just in case).
>
> Also another down side is, it is bypassing the BPFs in an earlier stage.
> Not the end of the day, but it would be better if the RX ANT first passes
> through these filters before passing on the the RX's front end. The
> additional advantage is, the built-in protection relay would offer the
> necessary protection.
>
> 73 - Rick, DJ0IP
> (Nr. Frankfurt am Main)
>
>
> -----Original Message-----
> From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Carl
> Moreschi
> Sent: Thursday, January 15, 2015 10:42 PM
> To: Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] Separate receive antenna for Eagle.
>
> It's not an issue at all as long as the receive antenna and transmit antenna
> are not too close to each other. I have several radios here that do this
> exact thing. But it all comes down to antenna separation.
>
> Carl Moreschi N4PY
> 58 Hogwood Rd
> Louisburg, NC 27549
> www.n4py.com
>
>> On 1/15/2015 4:34 PM, Rick - DJ0IP / NJ0IP wrote:
>> SRI, but I think that is VERY DANGEROUS, Carl.
>>
>> The RX ANT line has a protection relay that grounds the line during TX.
>> This protects the RX front end. Unfortunately it is before the Cable
>> #2 your are referring to.
>>
>> Cable #2 is AFTER this relay, so the RX is no longer protected by that
>> relay.
>> I STRONGLY ADVISE NOT TO DO THIS!
>> (Unless of course you use your own external relay to protect the
>> Eagle's RX).
>>
>> 73 - Rick, DJ0IP
>> (Nr. Frankfurt am Main)
>>
>>
>> -----Original Message-----
>> From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Carl
>> Moreschi
>> Sent: Thursday, January 15, 2015 10:29 PM
>> To: Discussion of Ten-Tec Equipment
>> Subject: Re: [TenTec] Separate receive antenna for Eagle.
>>
>> There's a much easier way with no relays at all. You would end up
>> with a spdt switch to select the receive only antenna.
>>
>> Inside the Eagle, you will find cable #2. This cable carries the
>> receive signal to the Eagle receiver. All you have to do is cut this
>> cable and bring the two connections out of the back of the Eagle. One
>> end of the cable would go to the common of the spdt switch. The other
>> end of the cable would to the normally closed contact of the switch.
>> The receive antenna would go to the normally open contact of the switch.
>>
>> That's all you need. No relays at all.
>>
>> Carl Moreschi N4PY
>> 58 Hogwood Rd
>> Louisburg, NC 27549
>> www.n4py.com
>>
>>> On 1/15/2015 4:17 PM, Katz Ajamas wrote:
>>> Any suggestions?
>>>
>>> I'm thinking 3 SPST reed relays . One to switch the Tx antenna. One
>>> to switch detuner for the Tx antenna. One to switch the Rx antenna.
>>> The reed relays switch in ~1ms so the 17ms transmit antecedent is
>>> plenty. They are rated for 10**7 cycles.
>>>
>>> 73, Bob ah7i/w4
>>> _______________________________________________
>>> TenTec mailing list
>>> TenTec@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/tentec
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