[NLRS] 10 GHz relay

[Arliss]

Thanks, Jerry (and Donn, from a direct email).  I now feel better 
about using the relays I have on hand.

Digging around in my junk, I found some Teledyne Microwave 
transfer switches.  It's my understanding their isolation is less 
than the SPDT types because there are 2 leakage paths rather than 
1 (?).  On the other hand, they would allow the receive port of 
the transverter to be grounded on transmit (I think that's correct).

I think I'll just go with the Transco.

Thanks again.

73,  Arliss


On 8/12/2014 3:53 PM, Dr. Gerald N. Johnson wrote:
>
>
>
>
> 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