[NLRS] Tohtsu relay power ratings and isolation

[Lloyd Berg N9LB]

Based on the terrific published specs,  I purchased several Tohtsu 
CZX-3500 relays for use with power amps and LNAs.

I burned out several LNA's.  Since I don't have a lot of test equipment 
I asked others if they had any insight into what was causing my 
burn-outs.  Steve at DEMI informed me that the published specifications, 
including isolation of the CZX-3500 was nowhere as good as the specs 
said.

I have removed all CZX-3500 and have started re-building things with 
either CX-600N relays for VHF or surplus microwave relays for UHF - no 
more problems as far as I have gotten with the rebuilds.

Yes, I got burned by the Tohtsu CZX-3500 relays, expensive and poor 
performance.  I still don't have a lot of my LNAs and Amps working.

73

Lloyd - N9LB


On Tue, Jul 15, 2014 at 11:08 AM, Mike King - KM0T wrote:

>> Anyone have any experience with the Tohtsu CZX-3500?  I purchased a 
>> few of these to share feed lines between a few bands...  (50 MHz / 
>> 222 MHz) (144/432)
>>
>> The specs on the relays I purchased turned out not to be not the same 
>> as indicated on the
>> website that I got them from.
>>
>> The data sheet for the relays I received say 1000 watts input power 
>> PEP for
>> 50 and 150 MHz, as well as 800 watts PEP for 500 MHz.
>> The website indicated 2300 watts PEP on 50 MHz, 2000 watts PEP on 150 
>> MHz
>> and 1000 watts cw at 500 MHz.  These are the specs I needed and based 
>> my
>> purchase on due to the power I will be running.
>>
>> Anyone know if there are two different versions of this relay?  I 
>> have a few old CZX-3500s from a long time ago, these are labeled 
>> dc-6ghz and 250 ma at 12v.   Now these new ones just say 230 ma, no 
>> freq rating.
>>
>> I am thinking of returning these, but the price was good.  Anyone 
>> know first hand if these handle 1.2 kW cw?
>>
>> Thanks and 73
>>
>> Mike - KM0T
>>
>> Sent from my iPad
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