[NLRS] 10 GHz relay

[Dr. Gerald N. Johnson]

On 8/12/2014 2:11 PM, Arliss wrote:
>
>
> Hi,
>
> I'm looking for information on what relay I can use to switch the output
> of my 10 GHz amp. We're talking 8 watts out. I have a Transco
> 82152-919C74700 and a MaCom MA7530-S134 -- both with SMA connectors.
> Perhaps I just missed it, but Googling the part numbers gave me some
> hits, but not information such as power handling ability and isolation.
> I'm wondering if anyone out there can offer some guidance.

One of my Transco catalogs says the 919 series SMA is rated at 14 watts 
at 10. 20 watts at 4 G, 39 watts at 1 G, and 59 watts at 400 MHz. That's 
switching cold, not hot.

Transco numbers are now sold by the Dow-Key division of Ducommun and 
listed in those catalogs on line. The power ratings for Transco relays 
is in a chart on page 6 of this catalog, power rating isn't listed on 
the pages for the part. The part page shows 65 dB the minimum 
specification for isolation at 10 GHz with typical isolation about 89 dB.
>
> Also, I have an HP coaxial switch: 8765B OPT 015 100, rated from DC-20
> GHz. It says maximum power is 2W, which I assume is at 20 GHz. The
> rating at 12 GHz is probably higher, but I'm guessing substantially less
> than 8 watts. Does anyone know better?

I found an HP applications note that says 2 watts is the absolute 
maximum at DC because the contacts are very tiny to work at 20 GHz and 
can't dissipate the heat from any higher power. They were made for 
instrumentation, not transmitting.
www.keysight.com/en/pd-1000002314%3Aepsg%3Apro-pn-8765B/coaxial-switch-dc-to-20-ghz-spdt?cc=US&lc=eng
offers the latest datasheet and applications notes. Keysight is the new
name for Aligent electronics that went into use August 1st. Spun off
again.

I'm finding some apparently new relays at 3 watts are showing a 10% 
power loss even when rated to 26.5 GHz when tested at 10 GHz.

I don't find anything on the MACOM or the DynaTech relay on this 
computer. WA1ZMS works for MACOM, he might have inside information.

If switched without RF the Transco should do OK if its not got a stray 
10 GHz resonance to cause excessive insertion loss. I have a Transco 
transfer relay that measures good and just received a new 919C70100 that 
I've not tested yet. Need to get one of them on the 10 GHz rig very 
soon. I have a Dow-Key transfer relay that shows that insertion loss 
sometimes. Its gone intermittent. I have a Ducommun rated to 26.5 GHz 
that shows that loss all the time, its magnetically latched.
>
> Thanks & 73,
>
> Arliss W7XU

>73, Jery, K0CQ