Is there a reason to favor relays over taking a pin diode to ground to
short the input during tx?
Art NK8X
ᐧ
On Sat, Aug 29, 2015 at 2:31 PM, Martin Kratoska <marcom@centrum.cz> wrote:
> Hi Douglas,
>
> I am sorry to tell you that none of the relays you have is good for the
> front end saver. They are usual small signal relays but a reed relay should
> be used. The most important thing is not the capacitance (assumed that the
> front end saver is used on 160, 80 and possibly 40 m), but the switching
> times.
>
> I would recommend to take part in a group buy. AFAIK David, G3WGN,
> organized a group buy/PCB fabrication of 80 units, possibly he may have
> rests for sale.
>
> 73,
> Martin, OK1RR
>
> Dne 29.8.2015 v 18:15 Douglas Ruz (CO8DM) napsal(a):
>
> Hi Martin, OK1RR,
>>
>> I tried email direct to you but it was not possible. I am sorry about
>> the other member of the list.
>>
>> It is about the FRONT END SAVER relays:
>>
>> I have two different relays here and i would like to know if i can use
>> one of them in
>> your design:
>>
>> I have HFD2 Subminiature DIP relay:
>> -Matching standard 16 pin socket.
>> -DPDT
>> -100 million operations
>> - Operate time 4ms and release time 3ms.
>> -Capacitance: Contact to coil 5pF and contact set to contact 1,5 pF
>>
>> I have also HFD41 relay:
>> -SPDT relay
>> -10 million operations
>> -Operation time 10mS
>> -Not sure about capacitance.
>>
>> Maybe i have to RE-DESIGN the PCB but that is very easy.
>>
>> Any idea???...Thanks,
>>
>> 73....Douglas, CO8DM
>>
>>
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