[ARC5] Bandwidth for IF Transformers

[Fuqua, Bill L]

I kind of dropped into the tail end of this discussion. I see a previous email that a signal level was chosen such that
the AVC action was not an issue, i.e. low level. 
bill 
________________________________________
From: ARC5 [arc5-bounces at mailman.qth.net] on behalf of Fuqua, Bill L [wlfuqu00 at uky.edu]
Sent: Thursday, March 17, 2016 1:06 AM
To: J Mcvey; Bill Cromwell; arc5 at mailman.qth.net
Subject: Re: [ARC5] Bandwidth for IF Transformers

  I wonder if that bandwidth is measured with the AVC turned off. It can effectively broaden the measurement.
Also, as an interesting story:
  I an EE in  the electronics instrumentation lab in the physics department at the University of Kentucky for 32 years.
Back in the early 1980's a Polish graduate student came in the lab and asked if we had a wobbulator. My associates looked
at one another and obviously had no clue what he was talking about. I introduced him to one of our HP signal generators
and told him that this will probably work even though it was not a true sweep generator. It seems that "wobbulator" was in
his well used Polish to English dictionary. After he left I had to explain to the guys what a wobbulator was and how the term
came about.

73
Bill wa4lav

________________________________________
From: ARC5 [arc5-bounces at mailman.qth.net] on behalf of J Mcvey via ARC5 [arc5 at mailman.qth.net]
Sent: Wednesday, March 16, 2016 9:22 PM
To: Bill Cromwell; arc5 at mailman.qth.net
Subject: Re: [ARC5] Bandwidth for IF Transformers

The ARC-5 manual page 60 has table 6-4 which has selectivity measured as a function of input .
The R-24 at 2X "standard output" is listed as 1.1KHZ . I guess a weaker signal would be better but the worst case scenario at 1000X is 4.5KHZ
It does not say if the rods are in or out, but I suppose it's in broad mode since most of the others are not adjustable and there is no asterisk.

Jim


On Wednesday, March 16, 2016 6:12 PM, Bill Cromwell <wrcromwell at gmail.com> wrote:


Hi Phillip,

The specs say the 85 kc cans are (depending on source) 2 kc, 1.5 kc or 1
kc. I saw where somebody reported less than 1 kc. The 2 kc I found in
one of the "official' manuals and 1.8 kc in yet another "official"
manual. I suspect some of those are for a single can, a single can with
a sweep tuneup, an entire I.F. strip peaked by ear, and an entire I.F.
strip tuned up with a sweeper (aka wobbulator). I use them with the rods
all the way up and peaked by ear. It was tough enough to get an 85 kc
signal source and never mind a sweeper. I have no use for an I.F. strip
that is opened up but they are supposed to pass AM phone with the rods
down and aligned.

I have no 239 kc cans nor any radios that use them and so I have no
recall of specs.

I hope this helps. I am sure others have data to add to this - for the
239 kc cans especially. 85 kc wobbulator is on the to-do list. so some
day...

73,

Bill  KU8H


On 03/16/2016 04:05 PM, Phillip Carpenter wrote:
> Has anyone measured the bandwidth passed for the 85kHz IFs and the 239kHz IFs with the rods pushed all the way in and then with the rods pulled all the way out?
>
> I'm curious as to how the two IFs compare as to bandpass relative to CW/SSB and AM/DSB.
>
> Thank you in advance to all who reply!
>
> Phillip W4RTX
>
> Sent from my iPhone
> ______________________________________________________________
>

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