Re: Topband: Relay info needed,

[MR TREVOR DUNNE]

Which of these would be suitable

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F162342540907

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F162738582467

I need 2 as I have a 80m wire suspended off the 160m vertical so I detune that 
as well when in RX

Also I'm switching the ground of the coax so when I'm in Rx the coax gnd is 
floating is this needed as it would reduce the need of a third relay,



Thanks
Trevor
- Original Message -
From: John K9UWA <j...@johnjeanantiqueradio.com>
To: MR TREVOR DUNNE <ei2...@eircom.net>
Sent: Mon, 13 Nov 2017 03:18:34 - (GMT)
Subject: Re: Topband: Relay info needed,


http://www.w3.org/1999/xhtml; xml:lang="en" lang="en">





Most people use a Vacuum Relay called an RJ-1 as they have 
enough 
current ability and they are FAST as Fast is most important or else you will 
burn up the relay when you hit transmit and the relay isnt back to 
transmit 
position when it hits it arcs and welds the contacts. Or blows 
them.


John k9uwa


 Hi All
 
 So after I got my vertical all tuned in I have been having 
a blast on TB over
 the last week or two, 
 
 Thanks to everyone who helped me with that by the way, 
there was too many of you
 to reply to everyone but I cant thank you all 
enough,
 
 Anyway on to the next problem,
 
 I built a small relay box to disconnect the vertical from 
the coax to reduce
 re-radiated noise on my RX antenna,
 
 This evening I was checking and TB seemed very quite and 
it seems that the relay
 has burnt out, ( iwent out at 11pm to short it to work the 
9U for a new one)
 
 its a 12v 30amp automotive relay one you would use 
for spot lights or an air
 horn ect,
 
 Im guessing this isnt up to the job, I have the 
relay in line between the end
 of the vertical and the top of the coil as that where I 
was told to place it,
 
 Can anyone recommend a better relay for the job, ideally 
it would be 12v coil as
 thats what I have going out to the box,
 
 I was looking at some split charge relays rated at 200 
amps would that be a
 better job or failing that Array solutions have some 
relays that might work but
 by the time Id get them over here would be 
expensive,
 
 https://www.arraysolutions.com/rf-10
 
 Thanks
 Trevor
 EI2GLB
 
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John Goller, K9UWA  Jean Goller, N9PXF
Antique Radio Restorations
Visit our Web Site at:
http://www.JohnJeanAntiqueRadio.com; 
target="_blank">
http://www.JohnJeanAntiqueRadio.com
4836 Ranch Road
Leo, IN 46765
USA
1-260-220-9456




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Re: Topband: Relay info needed,

[JC]

Hi   Trevor

Any open frame relay like that can destroy your reception.  I feel sorry to
see people selling and even recommending this type of relay, it is a shame.

The issue is speed and not current.

You can try this one for EU25 on ebay (4 mSec)

http://www.ebay.co.uk/itm/RF-vacuum-relay-Vakuumrelais-VR421-Siemens-270-Ohm
26-5-V-/281975931582

The destining relay is critical and can cause big problems if not
implemented right.

1- decouple and shield the relay line, sent 26V and switch to ground during
TX.

2- Never send voltage during RX, any relay has capacitance and can feed
noise into the TX antenna  if not protected from common mode noise , Doug
NX4D spent U$ 200 ++ on a 12V vacuum relay and the relay was energized
during RX, the time to RX is very long and the relay gets hot and can and
will generate noise. Doug lost VK0 and E31 due a s2 noise originate on his
detuning relay.

3- Fast is always better   the proved and reliable Jennings RJ1A-26S relay
that you can buy everywhere for U$50, is only 2 ms.

4- Sequencer is always recommended, and a delay on the RF generated  is a
must.

5- Choke, and choke , burry the cable, common mode noise is a huge problems
for 160 and 80m,

I hope you can fix that, 

73
JC
N4IS


-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of MR TREVOR
DUNNE
Sent: Sunday, November 12, 2017 7:21 PM
To: topband List 
Subject: Topband: Relay info needed,

Hi All

So after I got my vertical all tuned in I have been having a blast on TB
over the last week or two, 

Thanks to everyone who helped me with that by the way, there was too many of
you to reply to everyone but I can't thank you all enough,

Anyway on to the next problem,

I built a small relay box to disconnect the vertical from the coax to reduce
re-radiated noise on my RX antenna,

This evening I was checking and TB seemed very quite and it seems that the
relay has burnt out, ( iwent out at 11pm to short it to work the 9U for a
new one)

it's a 12v 30amp automotive relay one you would use for spot lights or an
air horn ect,

I'm guessing this isn't up to the job, I have the relay in line between the
end of the vertical and the top of the coil as that where I was told to
place it,

Can anyone recommend a better relay for the job, ideally it would be 12v
coil as thats what I have going out to the box,

I was looking at some split charge relays rated at 200 amps would that be a
better job or failing that Array solutions have some relays that might work
but by the time I'd get them over here would be expensive,

https://www.arraysolutions.com/rf-10

Thanks
Trevor
EI2GLB

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Re: Topband: Relay info needed,

[Steve Babcock]

Try either a RF52-26S or a RF5A-26S. They are 26v units….not 12v. They might 
have 12v variants. I use these to do all my 160m detuning and band switching 
with no problems. 15Kv, 15 amps or 7.5KV and 10amps. RF rated. Data sheets 
specify RF ratings vs frequency.
Go here: http://www.mgs4u.com/RF-Microwave/vacuum-relays-SPST.htm 


de steve ve6wz.

On Nov 12, 2017, at 5:20 PM, MR TREVOR DUNNE  wrote:
> 
> 
> Hi All
> 
> So after I got my vertical all tuned in I have been having a blast on TB over 
> the last week or two, 
> 
> Thanks to everyone who helped me with that by the way, there was too many of 
> you to reply to everyone but I can't thank you all enough,
> 
> Anyway on to the next problem,
> 
> I built a small relay box to disconnect the vertical from the coax to reduce 
> re-radiated noise on my RX antenna,
> 
> This evening I was checking and TB seemed very quite and it seems that the 
> relay has burnt out, ( iwent out at 11pm to short it to work the 9U for a new 
> one)
> 
> it's a 12v 30amp automotive relay one you would use for spot lights or an air 
> horn ect,
> 
> I'm guessing this isn't up to the job, I have the relay in line between the 
> end of the vertical and the top of the coil as that where I was told to place 
> it,
> 
> Can anyone recommend a better relay for the job, ideally it would be 12v coil 
> as thats what I have going out to the box,
> 
> I was looking at some split charge relays rated at 200 amps would that be a 
> better job or failing that Array solutions have some relays that might work 
> but by the time I'd get them over here would be expensive,
> 
> https://www.arraysolutions.com/rf-10
> 
> Thanks
> Trevor
> EI2GLB
> 
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> Topband Reflector Archives - http://www.contesting.com/_topband

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