[hpsdr] Possible 5 band VHF transverter?

[Dick Faust]

Hi Phil

This is similar to what I thought would be needed and that the phase 
locking might be even more complicated.

Since I am not inhibited by soldering SMT parts I think I will try using 
a FIN1001 [SOT23] in a deadbug  mounting on top of U14 pin5 
[SN65LVDM180D] and then run twisted pair out to a FIN1002, which will 
return the signal to LVTTL which should be good for the mixer.

This approach would also work with Mercury which has LVDS outputs.

I am also also thinking that I will use a 19.660880 Xtal with an ICS501 
[x6.25] for initial testing so I won't have to mess up any boards till 
the end.

Your #1 is nice and clean, and if the cable ran over to J1 it would 
simplify the connections over a twisted pair system.

Your #2 not as good for me as I think it would require a special mod to 
the firmware that would just add to the record keeping headaches.

Need to think some more about this.

Thanks for your help.  73

Dick K9IVB

Phil Harman wrote:
> Hi Dick,
>
> There are a couple of ways to do this.
>
> 1. Connect directly to the output of the 122.88MHz VCXO on pin 3.  I 
> suggest you do this via a low value capacitor (say 4.7pf) into a 
> length of small diameter 50 ohm coax.  You can then amplify the LO 
> level externally to the level required for your mixer.
>
> 2. Bring the 122.88 MHz signal out to one of the pins on J14.  This 
> will mean the loss of one of the DEBUG_LEDS since they share J14 pins 
> but has the advantage that no soldering is required.  Connect to the 
> pin and ground  as per the above.
>
> 73 Phil...VK6APH
>
>
>
> -----Original Message----- From: Dick Faust
> Sent: Sunday, March 17, 2013 4:37 AM
> To: HPSDR
> Subject: Re: [hpsdr] Possible 5 band VHF transverter?
>
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Phil
>
> It would be beneficial if the 122.88 MHz phase locked signal were
> available to use with a simple 2M circuit like/similar to the one  Paul
> Wade W1GHZ describes as Miniverter-F
> www.w1ghz.org/small_proj/Miniverter_F.zip
> and available from Down East Microwave as a kit
> http://www.downeastmicrowave.com/ghzmini.htm
>
> This approach would be quite simple to get to 144MHz, especially if one
> has a PA with a receive preamp.
> The other bands may be able to use with a multiplier circuit [ie 122.88
> x3 = 368.64 & would yield a 146.64MHZ IF for 222MHz].
>
> The 5 band unit would probably need more signals to phase lock an
> oscillator like the ones mentioned in the other posts.  I can not
> determine where or how the phase lock signals originate or how to access
> from the Hermes schematics.
>
> Thanks 73
> Dick K9IVB
>
> Phil Harman wrote:
>> Hi Dick,
>>
>> What actual signals do you need from Hermes since there are some 
>> spare IO
>> pins that it may be possible to route them to?
>>
>> 73 Phil...VK6APH
>>
>> -----Original Message----- From: Dick Faust
>> Sent: Saturday, March 16, 2013 9:27 AM
>> To: hpsdr at lists.openhpsdr.org
>> Subject: Re: [hpsdr] Possible 5 band VHF transverter?
>>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Fortunately, or unfortunately, I already know that it is not yet
>> possible to use Hermes signal sources for external PLL synthesizer.
>> What I was looking for is the proposed method to be considered to
>> actually use those signals.
>>
>> Dick K9IVB
>>
>> Helmut, DC6NY wrote:
>>> Hi Dick,
>>>
>>> Hermes does not provide additional PLL capability yet, but it is 
>>> possible to use Hermes signal sources as reference for external PLL 
>>> synthesizer.
>
>>>
>>> 73, Helmut, DC6NY
>>> -----Ursprüngliche Nachricht-----
>>> Von: hpsdr-bounces at lists.openhpsdr.org 
>>> [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Dick Faust
>>
>>> Gesendet: Freitag, 15. März 2013 21:00
>>> Cc: hpsdr at lists.openhpsdr.org
>>> Betreff: Re: [hpsdr] Possible 5 band VHF transverter?
>>>
>>> ***** High Performance Software Defined Radio Discussion List *****
>>>
>>> Hi
>>>
>>> Would someone, briefly, outline how and where you can get the phase 
>>> locksignals from Hermes.  The Atlas Bus boards are more obvious.
>>> Thanks
>>>
>>> Dick K9IVB
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