[time-nuts] Re: HP 115BR Clock 60 Hz output option

[John Vendely]

Hi Jeremy,

Thanks for the reply.  If nothing else, I'm curious to see how HP 
accomplished the 60 cycle output option.  Though trivial today, 
synthesizing 60 cycles from the frequencies available in the 115BR 
wasn't so convenient back then, given the primarily analog and 
rudimentary digital methods available at the time...

73,

John K9WT

On 3/6/2023 7:24 PM, Jeremy Nichols via time-nuts wrote:
> Sorry I can’t contribute here. My 113AR does not have a 60 Hz output
> option, which could be convenient for running a standard clock. The outputs
> of my 113AR are half a volt, approximately. A 60 mV output does sound on
> the low side.
>
> Possibly tvb (Tom Van Baak) will see your message and respond. He has a 115
> and probably the manual too, although I don’t know if his 115 has the
> option of a 60 Hz output.
>
> Jeremy
> N6WFO
>
>
>
> On Mon, Mar 6, 2023 at 4:22 AM John Vendely via time-nuts <
> time-nuts at lists.febo.com> wrote:
>
>> The HP 115BR clock was available with an optional 60 Hz output. The
>> service manual mentions the option but provides no schematic. My 115BR
>> has the 60 Hz output option (a front-panel placard reads "Specif. H08
>> 115R), and after running it for over 30 years, I'm finally getting
>> around to using it to drive a synchronous motor clock via a small
>> class-D power amp and step-up transformer. However, the 60 Hz output
>> level is very low, around 60 mV p-p, and somewhat distorted.  I doubt HP
>> designed it that way.  Before going to the trouble of
>> reverse-engineering it, I thought I'd check to see if anyone has seen a
>> schematic or other information on this option?
>>
>> Many Thanks,
>>
>> John
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