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Cheap High Power 50 / 144 MHz Relay

Cheap High Power 50 / 144 MHz Relay
Product Code: 2002
Price: 0.00€
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Cheap QRO Relay 50 / 144 MHz with high isolation

Intended to switch antenna to QRO or preamplifier without need for another isolation relay.

This relay is good enough to protect any sensitive preamplifier.
Relay is good for VHF contests and for EME.
You can buy better relay for 5  to 10 times more money, but intention is not to compete with industrial relays.
Just homebrew that will do job. 
This is about 1 day task.
 
To make this QRO relay You need:
200W soldering iron to solder 7/16 DIN connectors.
60 - 100W soldering iron to help soldering big surfaces.
30W soldering iron.
 
Basis is 1mm copper 135 x 40 mm.
Distance between connectors 40 mm.
 
Cheap-High-Power-Relay-144MHz-50MHz-2m-6m-DIN-7-16-coonectors
 
"NC" is TX side (7/16 - 7/16 DIN connector).
"NO" is RX side (7/16 - N connector).
Relay is energized at receiving. It allows to have same power for preamplifier and relay.
 
Bill of materials:
2 pcs. of 0.5mm copper. Approximate dimensions:
 
Copper
 
These copper sheet are used to shorten central pins and NC pins of relays.
 
Inside view:
 
Cheap-QRO-Relay-YU1CF
 

About 35mm UT-141 Teflon cable (RG-402, RG-316)
http://uk.farnell.com/pro-power/rg402/cable-coax-semi-rigid-rg402-1m/dp/2064899

About 35mm UT-325, EZ-325 or other solid Teflon 8mm cable.
Or RG-401 (UT-325 will be better)
http://uk.farnell.com/pro-power/rg401/cable-coax-semi-rigid-rg401-1m/dp/2064898

2 pcs of Finder 41.61 12V relay
http://uk.farnell.com/finder/41-61-9-012-0010/relay-pcb-spco-12vdc/dp/1169309

or Schrack RT314012
http://uk.farnell.com/te-connectivity-schrack/rt314012/relay-pcb-spco-12vdc-16a/dp/1629044

Isolation relay. Omron G6Z-1PE-A
http://uk.farnell.com/omron-electronic-components/g6z-1pe-a-dc12/relay-stable-spdt-pcb-12vdc/dp/2076423
http://www.digikey.com/product-detail/en/G6Z-1PE-A%20DC12/G6Z-1PE-ADC12-ND/1816270

How does it work?

On transmit side signal passes through 2 pcs 16A relays in parallel to 7/16 DIN connector
On receive side signal passes through isolation relay Omron G6Z-1PEA to Teflon "N" female connector.

 

Cheap-High-power-144MHz-50MHz-Relay-Schematic
 
 
50MHz-144MHz-Cheap-QRO-Relay-YU1CF
 
QRO relay-HP-relay-YU1CF
 
QRO relay-HP-Relay-Side-View
 
QRO relay-HP-relay-Side-View2
 
How are characteristics measured?
 
1. HP8753ES Network Analyzer was calibrated Full 2 port.
2. Through calibration was done with N - N barrel.
3. All losses are "barrel losses" + presented data
 
 
7/16 DIN - 7/16 DIN TX side.
S21 (Insertion loss)
50 MHz - 0.005 dB
144 MHz - 0.006 dB
QRO-relay-Insertion-Loss
 
 
S11 (Return loss)
50 MHz -36 dB
144 MHz -27 dB
QRO-relay-S11-Return-Loss
 
 
7/16 DIN - 7/16 DIN Relay Engaged
S21
50 MHz   -17 dB
144 MHz  -9.5 dB
The only Drawback because of high capacity between contacts.
QRO-relay-S21
 
 
7/16 DIN - "N" RX side.
S21 (Isolation)
50 MHz - 86 dB
144 MHz - 79 dB

Cheap-QRO-relay-RX-Side-isolation

 

7/16 DIN - "N" RX side Engaged

S21 (Insertion loss)
50 MHz - 0.01 dB
144 MHz - 0.016 dB

QRO-relay-S21-Insertion-Loss

 

S11 (Return loss), RX side Engaged

50 MHz -38 dB
144 MHz -28 dB

Cheap-QRO-relay-Return-Loss-RX-Side

 

Relay may be placed in a waterproof plastic case for outdoor use.

http://www.antennas-amplifiers.com/Plastic-Boxes-Outdoor/Plastic-Box-Outdoor-DS

Cheap-High-power-144MHz-50MHz-2m-6m-Relay-DIN-7-16-Outdoor

This cheap 50 / 144 MHz relay as seen have very good characteristics adjusted for amateur use on EME and VHF contests.

There are no need for another isolation relay. You can connect preamplifier directly.
 
Like this one:
Low Noise Wideband Amplifier with SPF-5122Z
 
Or with Bandpass filter:
http://www.antennas-amplifiers.com/Band-Pass-Filter/144MHz-Bandpass-Filter-BPF
 
32 Ampere contacts are way beyond commercial coaxial relays, and will provide good margin for today's high power demand.
 
If You are unsure how to make relay do not hesitate to contact me.
If You do not have enough time to make relay, You can contact company "Dual" to make one for about 90 EUR (indoor use)
 
It is possible to make any combination of "N" male - female and 7/16 DIN male - female of your choice. Just ask for offer.
 
 
What others say about Relay.
"Goran,
We used your high power relays with great success on our recent VHF Field Day with EI9E. See
http://www.irts.ie/cgi/showresults.cgi?vhf15.html
and
http://www.rsgbcc.org/cgi-bin/claim.pl?Contest=VHF%20NFD&year=2015
to see how we are getting on.
 
73 John EI2FG"
 
 
This presentation is for amateur use only.

73 Goran YU1CF

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