[Lowfer] Icom R75 Frequency Jumps

[Pat Bunn]

I built the triplet on a very small PCM board. I got a signal that looked a little ugly so I never have hooked it up. I need to go ahead and install it. Lots less expensive than the British kit.

I use several of Wenzels circuits. I love the squarer on his site. It takes a variety if different voltage and different waveforms and outputs a nice logic level square wave. It works great for use in front of a Class D transmitter to convert various VFO signals. Uses a couple of 2N3906s and a 9 volt TO92 regulator.

Pat

Sent from my iPhone

On Aug 9, 2013, at 8:18 AM<jrusgrove at comcast.net> wrote:

> Pat
> 
> In the R-75 there are tuned circuits that follow where the tripler is injected so harmonics / fundamental rejection is not an issue. What is a bigger issue is the phase noise of the tripler. This needs to be kept to an absolute minimum - unless you like phase noise on your LO ;~0. That's why I went with Charles Wenzel's circuit ... Charles is the 'wizzard' of low phase noise.
> 
> Jay W1VD  WD2XNS  WE2XGR/2 WG2XRS/2
> 
> 
> 
> 
> ----- Original Message ----- From: "Pat Bunn" <pbunn at matrixei.com>
> To: "Discussion of the Lowfer (US, European, &amp; UK) and MedFer bands" <lowfer at mailman.qth.net>
> Sent: Friday, August 09, 2013 7:53 AM
> Subject: Re: [Lowfer] Icom R75 Frequency Jumps
> 
> 
>> Todd
>> 
>> I use a Thunderbolt for my station do I already have GPS . I  have seen the triplet that you use. I built several other designs but the signal from my test units were not as clean as I would have liked so I have not hooked it up,
>> 
>> Pat
>> 
>> Sent from my iPhone
>> 
>> On Aug 8, 2013, at 9:28 PM, <ToddRoberts2001 at aol.com> wrote:
>> 
>>> Pat, To lock my R75 to GPS I am using a DFS30 frequency
>>> tripler kit sold by Dave, G4HUP.
>>> I have my DFS30 hooked up to the 10 mHz
>>> output of a Thunderbolt GPS receiver.The DFS30 triples the 10mHz  output
>>> to substitute for the 30 mHz timebase in the R75.
>>> 
>>> You can learn more about the DFS30 kit here:
>>> 
>>> http://g4hup.com/DFS30/DFS30.html
>>> 
>>> The cost for the DFS30 kit is 27.50 GBP and Dave will accept  payment
>>> via PayPal. The kit uses surface mount components so one needs to
>>> be comfortable with soldering SMT if they would like to build their own
>>> DFS30.
>>> 
>>> Most of the Thunderbolt GPS receivers are sold out on eBay now but  there
>>> are a few left in the $225 price range. I have heard of some hams using a
>>> Jupiter GPS receiver but I am not familiar with that one. I believe the
>>> Jupiter
>>> only has a 10kHz output that needs to be multiplied up to 10mHz.
>>> 
>>> 73 - Todd WD4NGG
>>> 
>>> 
>>> 
>>> In a message dated 8/8/2013 3:01:59 P.M. Eastern Daylight Time,
>>> pbunn at matrixei.com writes:
>>> 
>>> Todd,
>>> 
>>> Did you use Jays circuit for GPS locking your R75?
>>> 
>>> Pat  Bunn
>>> N4LTA
>>> 
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