[Lowfer] Icom R75 Frequency Jumps

Fri Aug 9 12:37:50 EDT 2013

We are fortunate that Charles Wenzel's very avid hobby is primarily 
designing , building , and listening from DC through 2 MHz. when he is 
home in his lab .

He always has some neat projects going related to those frequencies 
aimed at being simple enough for the home builder to construct and use 
readily available parts .

He from time to time has been considering putting a part 15 lowfer and 
medfer beacon on the air .

He also is interested when people are experimenting on "new" frequency 
groups in the ranges below 2 MHz . He has a grabber that is online and 
is always ready to listen for a new station or new band if I just send 
him the frequency to park one of the grabbers on .

We have been discussing the 76 kHz. area work that is going on and he 
will put a grabber on that "band" if we have a little more information 
on the "watering hole" and if there are any particular beacons running 
any certain schedule . I was out of town often and missed some of the 
information about the stations and their status over the past month. Is 
there a place or a group that we can monitor for more information about 
the activity down there ?

I will put a grabber on from here in Northeast Oklahoma too , IF we ever 
get rid of the daily summer thunderstorms and noise .

Naturally I use a lot of Wenzel based designs or projects that have been 
built by me , with input from Charles for possible improvements . One of 
my receivers is the R-75 using Jay's information and one of my Wenzel 10 
MHz. OCXO's and the Wenzel tripler design which is also GPS disciplined .

Charles's grabber is located in Austin , TX. Just tell us a time and 
frequency .

Hopefully soon I will get around to applying for a part 5 license again 
to be able to also get on the "rest of the experimental bands" and catch 
up with most of the rest of the group .

Charlie , W5COV

On 8/9/2013 9:30 AM, Pat Bunn wrote:
> 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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