[Lowfer] Icom R75 Frequency Jumps

[jrusgrove at comcast.net]

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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