[AMRadio] Using Heath SB 610 Monitor Scope

W6OM w6om at cox.net
Mon Feb 11 22:31:00 EST 2008

Thanks Jim

You make excellent and insight points as always.  I have encountered the
issues you speak about in interfacing my 610's with various vintage
receivers like my NC-300 and 75A4.

Thank goodness that I stumbled across small 455Khz and other frequencies
"IF" cans at Antique Electronics Supply in Phoenix.  With some minor surgery
both 610's are monitoring received signals on my receivers.  On the NC-300 I
went directly to the plate of the 2nd IF and coupled it through a 5PF mica.

On the 75A4 I went to the grid of the 2nd detector tube and used 4.3 PF
mica.   Both have full deflection and ad a bit of "fun" to monitoring by
being able to see the everyone's signal.

But then, it has been mentioned from time to time that I am "a tad"
obsessive about these beautiful old boat anchors.

Cheers my friend 

Ron Weaver   W6OM


-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Geoff/W5OMR
Sent: Monday, February 11, 2008 7:19 PM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] Using Heath SB 610 Monitor Scope to monitor
modulationonAM transmitter

Jim Wilhite wrote:
> To anyone considering an SB 610 or 614, keep in mind they must be 
> constructed to match the IF frequency of the receiver to which they 
> will be interfaced.

I was under the impression that the 610 / 614 monitor scopes were for 
monitoring the 'transmitted' signal.

> Some of them were built to work with the Heath receivers with the 3 
> meg IF and those that were built for 455 Kc. had the coils that would 
> do so.
> If you find one for with the 3 Kc IF coils, 

kc?  you said 3meg(sic).  Which is it?

> it won't work properly with a NC 300 or NC 183D for example.  Heath 
> packaged the coils for both with the units and the builder chose which 
> he wanted.  I doubt you will receive the coils that were not used 
> during construction.   Check them out before you find you have 
> something that won't work with your receiver.

I was under the impression that the 610 / 614 monitor scopes were for 
monitoring the 'transmitted' signal.  Since I wasn't sure, I went looking.

Heathkit SB-610
The Heathkit SB-610 monitor scope is primarily designed for monitor the 
RF-signals, on-the-air signals, from the local transmitter. It can also 
be used to monitor received signals when connected to a receiver.
It monitors RF-envelop, RF-trapezoid and RTTY pattern. SB-610 has also a 
built-in two-tone sinewave AF-oscillator for SSB-transmitter adjustment.

The Monitor-Scope matches the SB-line.

Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)

73 = Best Regards,

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