[time-nuts] Fluke 207 VLF receiver info

paul swed paulswedb at gmail.com
Mon May 8 16:56:51 EDT 2017

I know the 207 well. I have one up and operating just fine.
Several items they do not tolerate the new WWVB bpsk signal at all the same
for your 117. Though the 117 at least seem to do semi ok. Amazingly, it
really should not.
I just had to re-cap all the small electrolytics all of them were seriously
off and low in value. Thats after many years of service. For me 10 years
and since its 1970s technology some place else. The caps really were not a
huge cost but a lot of work to change them.
The 207 actually is a better receiver then the 117 so its worth it.
I also replaced the fried audio amp with a modern chip design and disabled
the phase accumulator. It will drive you nuts with the click.

Bad news on the manual though I have one and it really can not be copied.
Its whats called a blue line the prints are large and multi page in size.
Still smells like ammonia. Its becoming very delicate with age.

On all of my wwvb receivers I use cheatn d-psk-r to get rid of the bpsk and
that allows them to work like they used to.

On the 117 whats up with the rf stage? I just had to re-tube and recap
mine. Cathode bypass. Wasn't that hard. There is a guy near boston that has
really good NOS and at reasonable prices. Not sure if some one hacked your
unit or perhaps lightning. But the TRF is rock solid with great gain. HP

Good luck

On Mon, May 8, 2017 at 3:24 PM, kc9ieq via time-nuts <time-nuts at febo.com>

> Hi all, stupid Yahoo apparently caused me to be bounced from the list,
> glad to be back in.
> Just picked up a Fluke 207 (no suffix?) VLF receiver/comparator, and would
> like to do some reading on it before putting any time or money into a
> rebuild.  From my recent 332B overhaul, every single electrolytic in this
> thing will be replaced if it's going to see active duty again.  I suspect
> it may possibly be a better unit than my HP 117A, which has a really messed
> up amplifier requiring replacement or a parts donor.  There doesn't seem to
> be a whole lot of info about this 207 online, hoping perhaps someone has a
> digital copy of the manual which could be emailed?  This one is also
> missing the top and bottom covers, if anybody happens to have a parts set!
> Regards, Chris
> Sent from my SMRTphone
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