Re: Topband: RX / TX antenna switching

[Mark Lunday]

I have used the RTR-1 from DXE for many years.  Flawless performance.

Mark Lunday, WD4ELG
Greensboro, NC  FM06be
wd4...@arrl.net
http://wd4elg.blogspot.com


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Re: Topband: RX / TX antenna switching

[Herbert Schoenbohm]

The RF Sense MFJ type of switch box are cheap but do have limitations.  
The DX-Engineering  RTR-1 is a bit more money but is considerably more 
user friendly with some added features like being able to check the RX 
antenna vs the TX antenna either with a momentary toggle switch or with 
the same switch in the up position which immediately reverts back to the 
TX antenna for RX.  I have two RTR-1's in the shack and they are well 
Engineered for the discerning low band DX-er with status lights and 
front panel control in a box in front of you. It also has the PTT safety 
lock out feature.




Herb Schoenbohm, KV4FZ


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ea6vq...@dxmaps.com

Gabriel,

View two products from MFJ enterprises, MFJ-1707 and MFJ-1708.

73,

Charles, W2SH
***

From: Topband <topband-boun...@contesting.com> on behalf of Gabriel - EA6VQ 
<ea6vq...@dxmaps.com>
Sent: Thursday, September 22, 2016 1:27 PM
To: 'Topband'
Subject: Topband: RX / TX antenna switching

I will appreciate your advice in the best (but simple) way to switch between RX 
and TX antennas for a transceiver that does not have a separate RX antenna 
input.

The system should be able to switch from RX antenna to TX antenna when PTT is 
applied (and vice versa) but also allow to switch between the two antennas 
during reception in order to compare.

I have thought about using a coax relay as I do switch the VHF preamps, but I 
think it's switching will possibly too slow and some RF could flow to the RX 
antenna, causing damage.

Any ideas will be welcome!

73. Gabriel - EA6VQ



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Re: Topband: RX / TX antenna switching

[kolson]

A second for the RTR-1. Well built and reliable.

73 Kevin K3OX

- Original Message -
From: Herbert Schoenbohm herbert.schoenb...@gmail.com
To: topband@contesting.com
Sent: Thu, 22 Sep 2016 13:35:12 -0400 (EDT)
Subject: Re: Topband: RX / TX antenna switching

I use the DX-Engineering RTR-1 which is the easiest and best solution 
IHMO.  It even provides protection by locking the RX portion out on 
Transmit by loop the PTT amp cable.  I have two of these units now and 
use them on all the Icom radios. They even have a special momentary 
toggle for check the TX antenna for A/B RX tests.  Must have been 
designed by a thoughtful amateur.



Herb Schoenbohm, KV4FZ


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 I will appreciate your advice in the best (but simple) way to switch 
between RX and TX antennas for a transceiver that does not have a separate RX 
antenna input.

 The system should be able to switch from RX antenna to TX antenna when PTT 
is applied (and vice versa) but also allow to switch between the two antennas 
during reception in order to compare.

 I have thought about using a coax relay as I do switch the VHF preamps, 
but I think it's switching will possibly too slow and some RF could flow to the 
RX antenna, causing damage.

 Any ideas will be welcome!

 73. Gabriel – EA6VQ



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Re: Topband: RX / TX antenna switching

[Charles Moizeau]

ea6vq...@dxmaps.com

Gabriel,

View two products from MFJ enterprises, MFJ-1707 and MFJ-1708.

73,

Charles, W2SH
***

From: Topband <topband-boun...@contesting.com> on behalf of Gabriel - EA6VQ 
<ea6vq...@dxmaps.com>
Sent: Thursday, September 22, 2016 1:27 PM
To: 'Topband'
Subject: Topband: RX / TX antenna switching

I will appreciate your advice in the best (but simple) way to switch between RX 
and TX antennas for a transceiver that does not have a separate RX antenna 
input.

The system should be able to switch from RX antenna to TX antenna when PTT is 
applied (and vice versa) but also allow to switch between the two antennas 
during reception in order to compare.

I have thought about using a coax relay as I do switch the VHF preamps, but I 
think it's switching will possibly too slow and some RF could flow to the RX 
antenna, causing damage.

Any ideas will be welcome!

73. Gabriel - EA6VQ



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Re: Topband: RX / TX antenna switching

[Jorge Diez - CX6VM]

Hola Gabriel

great product and great support from DXE or KD9SV

https://www.dxengineering.com/search/product-line/kd9sv-products-sv-dxiiss-dxpedition-ii-receive-antenna-switches

73,
Jorge
CX6VM/CW5W

2016-09-22 14:27 GMT-03:00 Gabriel - EA6VQ :

> I will appreciate your advice in the best (but simple) way to switch
> between RX and TX antennas for a transceiver that does not have a separate
> RX antenna input.
>
> The system should be able to switch from RX antenna to TX antenna when PTT
> is applied (and vice versa) but also allow to switch between the two
> antennas during reception in order to compare.
>
> I have thought about using a coax relay as I do switch the VHF preamps,
> but I think it's switching will possibly too slow and some RF could flow to
> the RX antenna, causing damage.
>
> Any ideas will be welcome!
>
> 73. Gabriel – EA6VQ
>
>
>
> _
> Topband Reflector Archives - http://www.contesting.com/_topband




-- 
73,
Jorge
CX6VM/CW5W
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Re: Topband: RX / TX antenna switching

[Herbert Schoenbohm]

I use the DX-Engineering RTR-1 which is the easiest and best solution 
IHMO.  It even provides protection by locking the RX portion out on 
Transmit by loop the PTT amp cable.  I have two of these units now and 
use them on all the Icom radios. They even have a special momentary 
toggle for check the TX antenna for A/B RX tests.  Must have been 
designed by a thoughtful amateur.




Herb Schoenbohm, KV4FZ


On 9/22/2016 1:27 PM, Gabriel - EA6VQ wrote:
Boxbe  This message is eligible for 
Automatic Cleanup! (ea6vq...@dxmaps.com) Add cleanup rule 
 
| More info 
 




I will appreciate your advice in the best (but simple) way to switch between RX 
and TX antennas for a transceiver that does not have a separate RX antenna 
input.

The system should be able to switch from RX antenna to TX antenna when PTT is 
applied (and vice versa) but also allow to switch between the two antennas 
during reception in order to compare.

I have thought about using a coax relay as I do switch the VHF preamps, but I 
think it's switching will possibly too slow and some RF could flow to the RX 
antenna, causing damage.

Any ideas will be welcome!

73. Gabriel – EA6VQ



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Topband: RX / TX antenna switching

[Gabriel - EA6VQ]

I will appreciate your advice in the best (but simple) way to switch between RX 
and TX antennas for a transceiver that does not have a separate RX antenna 
input.

The system should be able to switch from RX antenna to TX antenna when PTT is 
applied (and vice versa) but also allow to switch between the two antennas 
during reception in order to compare.

I have thought about using a coax relay as I do switch the VHF preamps, but I 
think it's switching will possibly too slow and some RF could flow to the RX 
antenna, causing damage. 

Any ideas will be welcome!

73. Gabriel – EA6VQ



_
Topband Reflector Archives - http://www.contesting.com/_topband

Topband: RX/TX Antenna switching

[cris blak]

Hello,

I'm interested to hear from you all, what do you use to switch RX/TX antennas 
on 160m band.
I'm currently use an INV-L as TX(RX) antenna and a K9AY for RX. 

In this moment I use a high power coaxial manual switch getting through INV-L 
or K9AY but this is very time consuming, especially in the contest.
I'm thinking of RX/TX switch choosing on RX between K9AY and INV-L and on TX, 
only INV-L, no metter what is used on RX side. I've tried with a high power 
coaxial relay but it doesn't work due to faster relays on PA. seems to me that 
a sequencer should be used.

Look for any practical ideas.

By the way, CQ160mCW contest was a success here with more than 600 QSOs in the 
log and several DX (also VE/K) stations.

73 de YO3FFF
Cristi
_
Topband Reflector

Re: Topband: RX/TX Antenna switching

[Shoppa, Tim]

I find it ironic that when I was a kid we all built T/R switches to use a 
single antenna with our separate Transmitter and Receiver.

Today we build a switch to use two antennas to interface with our fancy pants 
transceivers :-)

1: All but the small or entry level rigs already have a RX antenna input.
2: If you don't have a RX antenna input, then you can put a T/R relay on 
transceiver output.
3: Relay does not have to be fancy. Small 12VDC relays with contacts rated at 
several amps work fine (typical street cost, a dollar or two). High power 
coaxial relays seem completely unnecessary here. Remember at 100W levels the 
typical RF currents and voltages will be less than a few amps and less than a 
few hundred V.
4: Amp key line from the rig works well to drive the T/R relay. AFAIK all 
transceivers since the 1970's have an amp key line.
5: If you have an amp, the T/R relay can sit between rig and amp. This way the 
relay is only handling the lower power level. Again no need for fancy relays.
6: If (4) you will probably find that you can have QSK on 160M without having 
QSK in the amp - again gets down to the vagaries of PA vs T/R switch timing. 
Ironically I use my rigs amp key line to key the T/R relay at QSK rate, and 
my K1EL keyer PTT output to key the amp with hang time so its relays do not 
click on every dit.

Also... on a more interesting antenna switching contest, to switch between 
multiple receive antennas during a contest, I find it very natural to use 
footswitches to select receive antenna. This lets me comfortably switch receive 
directions after every CQ or while scanning the bands in SP.

And I think I saw you reversebeacon spotted during the contest, but the only YO 
I worked was YO8DOH.

Tim N3QE

-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of cris blak
Sent: Monday, January 28, 2013 5:15 AM
To: topband@contesting.com
Subject: Topband: RX/TX Antenna switching

Hello,

I'm interested to hear from you all, what do you use to switch RX/TX antennas 
on 160m band.
I'm currently use an INV-L as TX(RX) antenna and a K9AY for RX. 

In this moment I use a high power coaxial manual switch getting through INV-L 
or K9AY but this is very time consuming, especially in the contest.
I'm thinking of RX/TX switch choosing on RX between K9AY and INV-L and on TX, 
only INV-L, no metter what is used on RX side. I've tried with a high power 
coaxial relay but it doesn't work due to faster relays on PA. seems to me that 
a sequencer should be used.

Look for any practical ideas.

By the way, CQ160mCW contest was a success here with more than 600 QSOs in the 
log and several DX (also VE/K) stations.

73 de YO3FFF
Cristi
_
Topband Reflector
_
Topband Reflector

Re: Topband: RX/TX Antenna switching

[Jorge Diez - CX6VM]

Hello Cristi

I don´t know if your radio have RX input. Anyway if you use KD9SV DXPedition
II http://www.radio-ware.com/products/svdxii.htm this is not a problem, you
can use it and connect up to 4 RX antennas.

73,
Jorge
CX6VM/CW5W

-Mensaje original-
De: Topband [mailto:topband-boun...@contesting.com] En nombre de cris blak
Enviado el: lunes, 28 de enero de 2013 08:15
Para: topband@contesting.com
Asunto: Topband: RX/TX Antenna switching

Hello,

I'm interested to hear from you all, what do you use to switch RX/TX
antennas on 160m band.
I'm currently use an INV-L as TX(RX) antenna and a K9AY for RX. 

In this moment I use a high power coaxial manual switch getting through
INV-L or K9AY but this is very time consuming, especially in the contest.
I'm thinking of RX/TX switch choosing on RX between K9AY and INV-L and on
TX, only INV-L, no metter what is used on RX side. I've tried with a high
power coaxial relay but it doesn't work due to faster relays on PA. seems to
me that a sequencer should be used.

Look for any practical ideas.

By the way, CQ160mCW contest was a success here with more than 600 QSOs in
the log and several DX (also VE/K) stations.

73 de YO3FFF
Cristi
_
Topband Reflector

_
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