Garey,
Darnyes I would want transcieve.
I guess I will need a T-4XB or, I guess I could use my spare T-4XC?
Any downside to that?
73,
Lee
-Original Message-
From: Garey Barrell
To: kc9cdt
Cc: drakelist
Sent: Tue, Feb 1, 2011 10:51 pm
Subject: Re: [Drakelist] Wanted 4NB Noise Blan
Lee -
Those 'soft' filters are what makes the R-4B audio 'sweet'! :-)Very
little group delay, if any, and no distortion caused by sharp skirts of
crystal filters with 1.8:1 shape factors. But it you want to hear a
station for 'communication' purposes, hard to beat a crystal or
mechanica
Al -
There are two PLL's in the TR-7, one for the bands below 20M and another
for bands above. Your 'high band' VCO is not locking. The 'wandering'
frequency is just the free-running VCO going to it's 'idle' frequency
'or so', which should be around 32 MHz.
First suspect is corrosion on th
Should not be...on the Main panel the ground and neural are connected
together. On a subpanel the ground, neutral and hot are carried from
the main panel.
If you use a ground somewhere else all bets are off.
Lee
-Original Message-
From: Mike Pappas
To: Jim Shorney
Cc: drakel...@.z
That's why I love the Shewood system...I can flip a switch to have
front end roofing filter(s) or go back to the original 8KCthen the
NB works OK.
I choose day to day depending on what I am doing.
By the way...I have a R-4B here that I'm working on for a friend...and
I noticed the filters
The other question is what the difference between ground and neutral?
Hopefully not 20 volts AC..
Mike Pappas
advanceddigi...@mac.com
On Feb 1, 2011, at 8:08 PM, Jim Shorney wrote:
> Ah, but the questions are, what is a ground? And when is a ground not a
> ground?
> Also, when is more than
What I SAID was that 'the CW roofing filter is particularly bad' _WITH
RESPECT TO GROUP DELAY AND PULSE STRETCHING_ which makes the NB
useless. I'm not disparaging your expensive filter, group delay and
pulse stretching are a fact, the more poles, (sections,) the worse the
problem. As I als
On Wed, 02 Feb 2011 01:33:51 +, Nigel Gunn G8IFF/W8IFF wrote:
>That's fine if you can keep the RF and power circuits isolated.
See my other response.
73
-Jim
--
Ham Radio NU0C
Lincoln, Nebraska, U.S.S.A.
TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A,
HyGain
Ah, but the questions are, what is a ground? And when is a ground not a ground?
Also, when is more than one ground not a good thing?
73
-Jim
On Tue, 1 Feb 2011 21:23:37 -0500, Robert Spooner wrote:
>Three wire power cords insure that the fuse is always in the hot lead and
>that the chassis is
First things to check are the +24v power supply and those pesky Molex pin
connectors between the DR-7 and the boards underneath it.
73
-Jim
On Wed, 2 Feb 2011 00:49:10 -, Al Ward wrote:
>Hello to the group
>My TR-7 local oscillator for bands 20M and above will not lock. The display
>shows
Three wire power cords insure that the fuse is always in the hot lead and
that the chassis is at ground potential.
73,
Bob AD3K
-Original Message-
From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net]
On Behalf Of Jim Shorney
Sent: Tuesday, February 01, 2011 7:56 PM
That's fine if you can keep the RF and power circuits isolated.
On 02-Feb-11 00:56, Jim Shorney wrote:
On another
note, there is a school of though that says that three wire cords are not
desirable for radio systems.
73
-Jim
___
Drakelist mailing
No worries Bob,
Just e careful to not take the T3's when working on any ham equpment of
the tube type.
73,
Lee
-Original Message-
From: Bob Jackson
To: Drake List
Sent: Tue, Feb 1, 2011 7:25 pm
Subject: [Drakelist] autoxfmrs
My bad. Don't know what I was thinking. Must be the Tylon
On Tue, 1 Feb 2011 19:32:17 -0500 (EST), kc9...@aol.com wrote:
>I see no need for either one. All my vintage equipment now has 3 prong
>power cords. I put them on as soon as I get one.
>What am I missng???
Not much, unless you are using your radio in the shower. In theory, it could
protect you i
Go for it!
I have a Drake R-4C with every Sherwood mod (installed but Rob's guy)
and it is super!
It is so good that when I set it next to my Ten-Tec Orion II and do A/B
testing...for most situations it is equivelant.
There is an occational time when the fancy featues of the Orion II
wins...bu
Hello to the group
My TR-7 local oscillator for bands 20M and above will not lock. The display
shows it wondering up in frequency. The last band position that works
properly is the 7 MHz position and you can step the frequency segments up to
10 MHz and that is as high as it will go and stay locked.
RE: the GCFI...I only said that because the original post I read made
that comment. I have no actual knowledge yet on this topic but I am
learning.
Thanks to everyone for comments and suggestions. This is great!
Jim
Jim Larsen, AL7FS
Anchorage Alaska
907-345-3190
http://www.AL7FS.us/
On 2
I see no need for either one. All my vintage equipment now has 3 prong
power cords. I put them on as soon as I get one.
What am I missng???
73,
Lee
-Original Message-
From: Nigel Gunn G8IFF/W8IFF
Cc: Drake Forum
Sent: Tue, Feb 1, 2011 6:50 pm
Subject: Re: [Drakelist] Test equipment
Land Air has been on vacation. They got back on 1/28 or 29. Probably are just
behind and still catching up. Even when they are there it takes 2-3 days to get
a response.
Bob AG5X
From: T Poe
To: k4...@mindspring.com
Cc: drakelist@zerobeat.net
Sent: Tue, Fe
My bad. Don't know what I was thinking. Must be the Tylonol III's I'm taking.
Apologies.
Bob AG5X
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To keep your wife from blowing all of your insurance money on a Blond Surfer
Boy Toy from Santa Cruz? :)
But seriously if you get between the hot and ground it should trip the GFI
before sufficient current passes through your body and stops your heart.
Mike Pappas
W9CN
advanceddigi...@mac.com
Danger Will Robinson!An AUTOTRANSFORMER is most definitely NOT isolated.
A variac is a variable autotransformer. one needs to feed the varic
FROM a real two winding transformer to make it safe.
Curt
KU8L
Bob Jackson wrote:
In some corners, they're also called "autotransformers". My 5A
NO THEY'RE NOT.
An autotransformer doesn't provide isolation and you cannot have a 1:1 ratio
autotransformer.
On 02-Feb-11 00:06, Bob Jackson wrote:
In some corners, they're also called "autotransformers". My 5A one has served
me well for anything I've ever tackled or
will tackle. I keep the
On Tue, 1 Feb 2011 16:06:30 -0800 (PST), Bob Jackson wrote:
>In some corners, they're also called "autotransformers". My 5A one has served
>me well for anything I've ever tackled or will tackle. I keep the variac
>plugged into it.
An isolation transformer is not an autotransformer. A variac is
This should start a healthy discussion! I want to ask about mods (Sherwood
and other for the R4c). I am thinking of putting "the mods" in an R4c as
most of the comments on them are favorable. I have looked at the Sherwood
page several times. Although most of the kits (caps,ps, audio and 3rd mixer)
KO7I RESPONSE - "The CW roofing filter is particularly bad... but the 4NB is
good..."
SAY WHAT? I could not disagree with you more.
A unmodified R-4C has a Narrow Spaced Dynamic Range of 58dB while the
Sherwood modified R-4C has a dynamic range of 84dB. So in affect what you
have just said is th
In some corners, they're also called "autotransformers". My 5A one has served
me
well for anything I've ever tackled or will tackle. I keep the variac plugged
into it.
Bob AG5X
From: Nigel Gunn G8IFF/W8IFF
Cc: Drake Forum
Sent: Tue, February 1, 2011 5:49
Another source that you may want to try is Land Air Communications:
http://www.landaircom.com/index.html
I have emailed the other a couple of times to see if they would sell some of
the red LSB/USB indicator lens for the faceplates, but no one has replied
back. I just sent another email in the
On Tue, 1 Feb 2011 18:45:02 -0500 (EST), kc9...@aol.com wrote:
>Why is it recommended to use the GCFI?
The theory is that it will keep you from electrocuting yourself on the AC mains
my detecting an imbalance of current between the hot and neutral conductors and
opening the circuit. It won't help
On Tue, 01 Feb 2011 23:16:43 +, Nigel Gunn G8IFF/W8IFF wrote:
>You don't make one, you go buy it.
>It's just a 1:1 mains in/mains out power transformer.
>You probably need something rated for a couple of KVA. They're not cheap.
It's actually easy to build an isolation transformer - IF you ca
Because the original poster said he wanted to use a GCFI.
It's not needed with a double wound transformer.
Do building sites use isolating transformers for power tools?
In Europe they have to use a 55-0-55V transformer for portable tools by law.
I always got my isolating transformers from a build
Why is it recommended to use the GCFI?
73,
Lee
-Original Message-
From: Nigel Gunn G8IFF/W8IFF
To: jimlarsen2002
Cc: Drakelist ; TC Dailey
Sent: Tue, Feb 1, 2011 6:18 pm
Subject: Re: [Drakelist] Test equipment and getting started
You don't make one, you go buy it.
It's just a 1:1
Sources of isolation transformers:
http://www.hammondmfg.com/5cline.htm
http://www.newark.com/stancor/gis-250/isolation-transformer/dp/16M3780
Mike Pappas
advanceddigi...@mac.com
On Feb 1, 2011, at 4:16 PM, Nigel Gunn G8IFF/W8IFF wrote:
> You don't make one, you go buy it.
> It's just a 1:1
Okay, Nigel, can you suggest a couple of makes and models to consider?
I had heard one could be built but I guess not.
Thanks.
Jim
Jim Larsen, AL7FS
Anchorage Alaska
907-345-3190
http://www.AL7FS.us/
On 2/1/2011 2:16 PM, Nigel Gunn G8IFF/W8IFF wrote:
You don't make one, you go buy it.
It's
You don't make one, you go buy it.
It's just a 1:1 mains in/mains out power transformer.
You probably need something rated for a couple of KVA. They're not cheap.
Run the transformer from a GFCI protected power outlet.
On 01-Feb-11 23:06, Jim Larsen - AL7FS wrote:
While we are on test equipmen
While we are on test equipment topics...
I have been combing the internet for a building article on isolation
transformers and Ground Fault Circuit Interrupters (GFCI). I cannot
believe that I cannot find any. It is not even in the ARRL Handbooks I
looked at.
I want to start working on boa
Clyde -
Looks like he is back!! The site disappeared for a while, and someone
told me he had stopped making them.
Glad to see it was only temporary!!
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
Clyde wrote:
Front panel repro's
I used the Irad 6Khz 1st IF. Works well.
JB
VK2IFT
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Front panel repro's here?
http://www.4cfrontpanels.com/
73, Clyde K9JWI
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Steve -
I doubt there is an 'easy' way to do it. There is an optional NB for
the 2-C, the 2-NB that could probably be replicated and tucked away in
the 2-B. It's a fairly effective NB in the 2-C, and uses standard parts
with the exception of a transformer that shouldn't be too hard to duplic
Paul,
Years ago I read all of the Drake mods and other available information
regarding the GUF-1 and the recommendation was to install the 8 kHz GUF-1.
I have one in my R-4C and it makes a significant difference with adjacent
channel rejection compared to the original factory filter.
Ken, WA2LBI
Paul -
Yes, narrow filters limit the noise bandwidth, PLUS they tend to stretch
and delay noise pulses causing them to not match up with blanking pulses
or be too long to be effectively blanked. This is one design decision
for the four or six pole (can't recall which at the moment) filter tha
Garey is there any reasonably easy way to put a noise blanker into a 2B?
Thanks!
Steve WA9JML
On 2/1/2011 3:26 PM, Garey Barrell wrote:
Don -
You answered your own question/statement. I believe the words 'heavily
modified' were tossed around! :-)
The Sherwood mods essentially render the 4NB
I'm planning on adding a GUF-1 filter to my R-4C receiver. Any comments as
to the selection of either the 6 kHz or 8 kHz filter version of the GUF-1?
One comment on the web indicated that the 4NB is more effective with the 8
kHz GUF-1. Perhaps it's a decision that balances NB effectiveness ver
Don -
You answered your own question/statement. I believe the words 'heavily
modified' were tossed around! :-)
The Sherwood mods essentially render the 4NB useless, as you have
discovered. The CW roofing filter is particularly bad, as it narrows the
noise bandwidth seen by the NB, and delays
To All,
The R-4C noise blanker is effective depending on the type of noise. In my
case it handles the 20 over S9 raucous, pulsing hash generated by defective
street lights that try to restart every minute or so from dusk to dawn. It
is far less useful on other types of noise.
Ken, WA2LBI
On T
Don,
I have seen several situatons where it actually works quite nicely.
Pulse noise from a electric fence here...it nailed it pretty well.
Maybe yours needs alignment? Of course they are NG for atmosphere crap.
73,
Lee
-Original Message-
From: Don Jones
To: drakelist
Sent: Tue, Fe
OK - I am going to stir the pot some.
I have one of those 4NB noise blanker's installed in my R-4C. To be honest
that noise blanker is largely ineffective and over rated. I have seen them
sell for over $200 on e-bay. I scratch my head and wonder why? In My Humble
Opinion they are a over rated vess
Dale -
Rats That's too bad. Just the cost of doing business with idiots,
by mail!! :-)
The PTO should be ok, they're pretty rugged unless it get's hit hard
enough to bend the shaft. (I've seen that.)
The neon bulb is what used to be called an 'NE-2E', and is known today
as a 'A9A'.
I just bought a set of B-line twins and they arrived today, fedex. the seller
decided it was ok to just toss the 2 rigs into 2 box's filled with peanuts and
ship. Some how the receiver made it in good condition the t4xb,on the other
hand took a good front hit, bent up the face plate and a sli
On Tue, 1 Feb 2011 10:18:01 -0700, TC Dailey wrote:
>> Number three is my old Kenwood TS-430S (used as a receiver) - great for
>> finding out if that oscillator really IS working. - quicker than a counter
>> which comes later.
I've used my Realistic DX-400 for this. A sniffer cable attached to
THE most valuable piece of test gear on MY bench is my trusty Variac. I
run mine through an isolation xfmr, and use the heck out of it. Mounted
it in a nice box with ACV and ACA meters (EICO made one like this),
"standard spacing" banana jack outputs, AND a single 117vac outlet. I
also ha
me experience with a vom , however I have none with a
signal generator.
My question is, is this the correct choice and should I endeavor to acquire
and learn to use them.
Mike
KD0ACY
__ Information from ESET Smart Security, version of virus signature
database 5837 (20110201)
The VTVM manuals often warn of the same thing.
73
K1NR
On Tue, 1 Feb 2011 10:05:59 -0500 (EST)
gypsym...@aol.com wrote:
>
> Just happened to think that comment & reply might be
> appropriate to the
> whole list.
>
>
> Often, these meters connected one side of the line to
> the chassis of
I think if you use a HP 410B or 410C you will not have any issues??
73,
Lee
-Original Message-
From: Gypsymt34
To: Drakelist
Sent: Tue, Feb 1, 2011 10:07 am
Subject: Re: [Drakelist] line cords
Just happened to think that comment & reply might be appropriate to the
whole list.
Of
Just happened to think that comment & reply might be appropriate to the
whole list.
Often, these meters connected one side of the line to the chassis of the
meter, so that when you connect the negative of the meter to the radio,
sometimes you'll get quite a surprise.
Yep, just be careful
Mike - if you're an ARRL member there are lots of articles in past QST
magazines that may get you started.
One series by Doug DeMaw W1FB (SK) might be a good place to start. It was a
four-part series titled "Basic Equipment Servicing" that ran in QST from
December 1981 thru March 1982. You ca
The vtvm..sure and an RF Probe for it (DIY), a signal generator is nice
to have although one can do a lot of work with no or rudimentary
generator.
The single most useful piecc of equipment, in my opinion, is a scope.
Not just for troubleshooting and alignment of radio equipment..for any
el
Ahh, that word that scares - alignment. IF you are using a plug-in VTVM
(117vac), such as a Heathkit or EICO, check for voltage loops between the
receiver (or whatever) you're working on and the meter or signal generator.
Often, these meters connected one side of the line to the chassis of the
Michael,
The best thing to do is get started. I have an old ARRL publication which has
helped me with basic trouble shooting and helped me learn a few things along
the way. It is Understanding Amateur Radio, end ed., 1976. It has chapters
on: Some Needed fundamentals, How receivers work, and
After some considerable thought, I have decided to sell my TR7, RV7, MS7 and
PS7. I do have the original manaual in the Drake binder. I also have other
materials for the related accessories.
I would rather sell all of it as a single lot. Please don't inquire about
specific items.
The
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