Transco relay power rating

23cm, 2.4/3.4/5.7/10/24/47 GHz and above - antennas, propagation, operating, etc. Includes Optical communications, with light,
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VK7HH
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Transco relay power rating

Post by VK7HH » Mon Feb 04, 2019 1:07 pm

I've purchased a Transco failsafe switch from eBay - part number 82152-919C70100-8 28VDC DC-12GHz.

Trying to find a datasheet to specify the power rating of this relay. I want to run about 50W on 2.4GHz through it.
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VK4GHZ
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Re: Transco relay power rating

Post by VK4GHZ » Mon Feb 04, 2019 1:20 pm

Hi Hayden

These are an excellent (and affordable) relay.
Attached are the data sheets I have.

The 919C7, with an ideal match, is rated to ~25 W average power @ 2.4 GHz, so 50 W may be pushing the friendship.
I haven't experienced any dramas using one of these with my 30 W Spectrian PA running conversational SSB.
Has anyone reading this used them above 30W?
Transco 919 Series 18GHz Relay.pdf
(77.6 KiB) Downloaded 33 times

Transco Relay Power Chart.pdf
(346.38 KiB) Downloaded 39 times
Cheers,
Last edited by VK4GHZ on Mon Feb 04, 2019 1:29 pm, edited 1 time in total.
Adam, Brisbane
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VK7HH
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Re: Transco relay power rating

Post by VK7HH » Mon Feb 04, 2019 1:27 pm

Thanks for the reply Adam. Interesting the listing had them working to 12 GHz, but the datasheet has 18 GHz. OK on the 25W, yes I suspect it will be a bit much to run higher, I guess I'll have to source something else unless someone has done other tests. The output from my Spectrian is about 20W @ 12V, but at 24V that is where I'll get the extra power, thus bigger relay needed.

At least I can still use these on 3.4 GHz with a Stealth amp at 20W.

Regards
Hayden

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Re: Transco relay power rating

Post by VK2XAX » Tue Feb 05, 2019 2:47 pm

You might like to consider the Dynatech/Ducommun relays instead. Their SMA units are rated to a little more than100w@2Ghz, the ruggedized ones even more so.

Catalog here...

https://www.ducommun.com/pdf/RFCoaxialS ... 120215.pdf

Many on eBay here...

https://www.ebay.com.au/sch/i.html?_fro ... itleDesc=0

I use a dc-18 ghz model D3-413A3-b unit as the relay in my 13cm transverter.

regards

Tim
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VK7HH
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Re: Transco relay power rating

Post by VK7HH » Wed Feb 06, 2019 1:58 pm

Thanks Tim,
I bought one of these, well two of them :)

https://www.ebay.com.au/itm/LOT-OF-2-DY ... 2749.l2649

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Re: Transco relay power rating

Post by VK3QI » Wed Feb 06, 2019 3:30 pm

Hayden,

FYI Dynatech was taken over by Ducommun back in the last century, but Ducommun has kept the Dynatech style of coding for their range of coaxial relays.

If you refer to page 28 of https://www.ducommun.com/pdf/RFCoaxialS ... 120215.pdf

you will find that the relay D1 416A30B is

SMA,
Solder Terminals,
12-15volts,
Failsafe,
DC-18GHz (not shown, but 3 was 18Ghz),
Polarity not applicable,
B was an old code for a power rating but I don't have the details of that, but it is closely related to the standard power rating chart on page 6 and note their comment about when you are within -3dB of that figure!)

I have used a variety of Ducommun/Dynatech relays over the years up to 10Ghz with good results.

Cheers

Peter VK3QI

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Re: Transco relay power rating

Post by VK7HH » Wed Feb 06, 2019 3:37 pm

Thanks Peter,
Yes I followed the model numbers etc to see if it would suit.
Thanks again, this one will go into my 2.4GHz transverter box and the Transco will probably now live in my 3.4GHz transverter conversion as it will only be 20W.

Hayden

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