[Boatanchors] HP-8708A Synchronizer?

[David C. Hallam]

Ian,

The 606B is an excellent BA signal generator.  I got mine for $45 at a 
ham fest about 5 years ago.  It worked FB until a couple of months ago.  
I don't worry about the dial calibration as I connect the uncalibrated 
output to a frequency counter.  As I remember it's about 200 mV.

I know I had to pay more for the synchronizer than the SG.  Besides the 
purchase price, I had to pay shipping from St. Louis.

73

David
KW4DH

On 3/31/2014 12:01 PM, Ian Wilson wrote:
> Hi David,
>
> The power supplies in my 606B appear to be OK, but I will probably replace
> the
> electrolytics if I can get everything else set up.
>
> At the moment I am somewhat mystified by steps 5.42 and 5.44 in the manual.
> The carrier zero step works as expected (step 5.42), but then in 5.44 I get
> no
> output unless I change the modulation amplitude control (which is wrong).
> I'm sure
> I'll figure it out eventually.
>
> 73, ian K3IMW
>
>
>
>
> On Mon, Mar 31, 2014 at 8:15 AM, David C. Hallam <dhallam at knology.net>wrote:
>
>> Ian,
>>
>> I have a 606B and a synchronizer.  Now that my 606B is working properly, I
>> will get an idea of how well it works.  I had to replace filter capacitors
>> in the power supply.  That was a PITA job as the capacitors are somewhat
>> unusual.  The can is insulated and the negative is not connected to the
>> can. The ripple was way out of spec and the 606B frequency wouldn't
>> stabilize.
>>
>> I do have a manual for it.
>>
>> David
>> KW4DH
>>
>>
>> On 3/30/2014 9:04 PM, Ian Wilson wrote:
>>
>>> Thanks, Richard (and others who have replied similarly).
>>>
>>> There appear to be two 8708 manual versions available through ArTek (who I
>>> had
>>> never heard of until a few minutes ago). I will do that if I can't find
>>> the
>>> info floating
>>> around somewhere.
>>>
>>> 73, ian K3IMW
>>>
>>>
>>>
>>> On Sun, Mar 30, 2014 at 5:54 PM, Richard Knoppow <1oldlens1 at ix.netcom.com
>>>> wrote:
>>>   ----- Original Message ----- From: "Ian Wilson" <ianmwilson73 at gmail.com>
>>>> To: <boatanchors at qth.net>
>>>> Sent: Sunday, March 30, 2014 3:25 PM
>>>> Subject: [Boatanchors] HP-8708A Synchronizer?
>>>>
>>>>
>>>>
>>>>    Recently acquired an HP-606B signal generator. Although my initial
>>>>
>>>>> impression is that this is probably stable enough for most of my needs,
>>>>> the 'Synchronizer' sounds like an interesting box.
>>>>>
>>>>> I would guess that this is some sort of comb generator combined with
>>>>> a mixer-type phase detector that forms a weakly-locked PLL. Would be
>>>>> interesting to find a manual (no luck so far, not on BAMA, not on the HP
>>>>> historical sites that I've looked at). Would be glad of any info.
>>>>>
>>>>> There are a couple of these units on eBay but they are going for much
>>>>> more than I paid for my 606B :)
>>>>>
>>>>> 73, ian K3IMW
>>>>>
>>>>>        Try  ArtekManuals.com  not free but excellent reproductions. He
>>>> may
>>>> have it.
>>>>
>>>>
>>>> --
>>>> Richard Knoppow
>>>> Los Angeles
>>>> WB6KBL
>>>> dickburk at ix.netcom.com
>>>>
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>> Thomas Jefferson
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-- 
"I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them."
Thomas Jefferson


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