[AMRadio] 5100b Normal operation?

Mark Bell bell at blazenet.net
Sun Mar 20 10:40:40 EST 2005

On the HT-37, you still have to manually turn the function switch into the
MOX position for CW, then back into
STBY for receive.    There is a PTT modification for the HT-37, but I'm not
sure that applies to CW
as George would like.

George, this was normal for that era, and as such, it didn't need to be
"addressed".   Having PTT on the 5100B
is rather nice on AM/SSB.   However, other radios of that era, such as the
DX-100, do not have PTT for
phone, and you need to flip the HV switch On and Off.    Right now, when I
use my DX-100, I need to toggle the
transmitter's HV switch and the Receiver's function switch.   I'll get
around to changing that one of these days, but it's really not  a problem
with two switches to throw.

73 Mark K3MSB

----- Original Message ----- 
From: "Geoff" <w5omr at w5omr.shacknet.nu>
To: "Discussion of AM Radio" <amradio at mailman.qth.net>
Sent: Sunday, March 20, 2005 8:48 AM
Subject: Re: [AMRadio] 5100b Normal operation?

> George KB2Z wrote:
> > Morning all,
> > 5100b , Is it normal? question.
> > When in the HV setting the the tx relay closes and the rx mutes.
> > In phone with PTT its not an issue but in CW the HV switch acts more
> > like a send receive switch.
> > The rx is muted as long as the HV is on. Key up, key down, makes no
> > difference.
> > Is it normal for the 5100b or is something crossed?
> > If normal was it ever addressed? I dont need QSK but the on/off
> > switching of the HV is a bother.
> > Thanks in advance, George KB2Z
> >
> Yup, that's normal of all those older rigs that incorporated seperate
> transmitters and receivers.
> It wasn't until the 60's, with the advent of "vox" when 'break-in' CW
> came about.  I -think-
> one of the first rigs to do this, that was still a seperate machine from
> the receiver, was the
> Hallicrafter HT-37.
> Revolutionary, those 60's. :-)
> 73 = Best Regards,
> -Geoff/W5OMR
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