[R-390] R-390 Digest, Vol 73, Issue 24
SHELLY199 at aol.com
SHELLY199 at aol.com
Fri May 21 20:07:41 EDT 2010
Glenn,
I to have used the Lankford mod with the two diodes in many IF modules and
find that the 914 diodes break down. I've been using 1n5060 diodes and
find a remarkable AGC in a properly operating IF module. Try it you'll like
it!
Rich WD2Q
In a message dated 5/21/2010 12:03:18 P.M. Eastern Daylight Time,
r-390-request at mailman.qth.net writes:
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When replying, please edit your Subject line so it is more specific
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Today's Topics:
1. 390A AGC (wa4aos at aol.com)
2. R-391 For sale (Mark McNulty)
3. Re: R-390 Digest, Vol 73, Issue 23 (bernie nicholson)
----------------------------------------------------------------------
Message: 1
Date: Thu, 20 May 2010 12:43:44 -0400
From: wa4aos at aol.com
Subject: [R-390] 390A AGC
To: r-390 at mailman.qth.net
Message-ID: <8CCC652BF2C56A3-90C-EA8 at webmail-m018.sysops.aol.com>
Content-Type: text/plain; charset="us-ascii"
Hi Group,
I am working with different AGC mods, 5 so far, that I have found on the
web and in ER. The Lankford mod looked most promising initially but I had
problems with it bowing diodes but fairly decent AGC when working. Recently I
found, with the help of Ray at ER, the W0BY mod listed in issie 208 of ER
and it looked very promising as well, however, it still pops on loud
signals going quiet. A good example are the morons who tune across the bands with
full power, especially annoying if you are coping CW with headphones. I
have noticed it on strong SSB signals as well. The article in ER seems to
indicate this should not be a problem but yet it is and on 3 different modules
wired correctly; perhaps there is something external to the mod that is
affecting this AGC mod. I am working with late run EAC modules presently and
was wondering if others had had success with an AGC mod that REALLY worked
well. I will say that the W0BY mod does work much better than stock 390A
AGC.
The Lankford mod as listed on the web is kind of tricky to follow as
listed from his hand drawings but I have made many notes and easy to follow
schematics. If I get the diode problem resolved, I will release my notes to
the group if anyone wants them. I tried to contact Dr Lankford but he is not
available and I can only ASSUME he would not mind if I offer help to
clarify his notes as well as my own experiences and documentation.
I found the article in ER to be very well written and easy to follow but
again that author was not available for questions or comments. Maybe they
found something more worthwhile to do with their time instead of playing with
90 pound radios; bass fishing comes to mind. Hi.
I may try increasing the PIV of the diodes that were in the Lankford mod
but to date I have had 4) IF modules blow diodes from that mod after some
use.
Perhaps implementing SSB compatible AGC with the 390A is not necessary but
the receiver has so much going for it that I want to go a step further. I
know I am preaching to the choir. Hi
Any thoughts would be appreciated.
Regards,
Glenn WA4AOS
------------------------------
Message: 2
Date: Thu, 20 May 2010 13:10:27 -0700 (PDT)
From: Mark McNulty <noggie1999 at yahoo.ca>
Subject: [R-390] R-391 For sale
To: r-390 at mailman.qth.net
Message-ID: <2263.95647.qm at web36506.mail.mud.yahoo.com>
Content-Type: text/plain; charset=us-ascii
Hi Everyone,
If anyone is interested in a R-391 email me for info and pictures.Thought
I would check here before putting on Ebay.
Mark
------------------------------
Message: 3
Date: Fri, 21 May 2010 13:08:47 +1000
From: "bernie nicholson" <vk2abn at bigpond.net.au>
Subject: Re: [R-390] R-390 Digest, Vol 73, Issue 23
To: <r-390 at mailman.qth.net>
Message-ID: <8EEB529A92CF41CD8E1561E9B78A9015 at berniePC>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
I have two HP 606 s one is an ''A'' That I got from Pete Vk3Iz [on this
list] the other a ''B'' was a throw out ,although I did donate 20$ to
our
radio club ,to get the last one , They have been very reliable over the
last 15 years ,but one did develop a fault in the leveling circuit ,it
turned out to be a High value resistor, I have collected some spare
tubes
to support them acquired at Trash and Treasure sales , they both are
capable of very high output +23Dbm into 50 ohms ,I use them for doing
dynamic range and blocking tests along with a HP return loss bridge ,
also
to power my GR916A RF bridge , They are both valued Items at this QTH
Regards to all Bernie N VK2ABN
----- Original Message -----
From: <r-390-request at mailman.qth.net>
To: <r-390 at mailman.qth.net>
Sent: Friday, May 21, 2010 2:00 AM
Subject: R-390 Digest, Vol 73, Issue 23
> Send R-390 mailing list submissions to
> r-390 at mailman.qth.net
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://mailman.qth.net/mailman/listinfo/r-390
> or, via email, send a message with subject or body 'help' to
> r-390-request at mailman.qth.net
>
> You can reach the person managing the list at
> r-390-owner at mailman.qth.net
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of R-390 digest..."
>
>
> Today's Topics:
>
> 1. HP 606A: Seeking cabinet and RF shield UPDATE (David Wise)
> 2. Re: HP 606A: Seeking cabinet and RF shield UPDATE (Barry)
> 3. Re: HP 606A: Seeking cabinet and RF shield UPDATE (Bill Hawkins)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 19 May 2010 12:19:42 -0700
> From: David Wise <David_Wise at Phoenix.com>
> Subject: [R-390] HP 606A: Seeking cabinet and RF shield UPDATE
> To: "'hp_agilent_equipment at yahoogroups.com'"
> <hp_agilent_equipment at yahoogroups.com>, "'r-390 at mailman.qth.net'"
> <r-390 at mailman.qth.net>
> Message-ID:
> <B59B72B1B1500C42BEB1374A84C366BD2EF103B41B at SJ-EXCHMB.phoenix.com>
> Content-Type: text/plain; charset="us-ascii"
>
> There was one black beauty and one small axial-lead electrolytic.
> I replaced them without even checking them. And some of the
> coils had come loose and needed to be glued back onto the turrets.
>
> It works, on all bands, AM and CW. I think it's a winner,
> so now I'm truly interested in a shield and cabinet. (I have
> hear that the cabinet is common to many instruments of the
> same vintage. However, the manual lists it as part number
> 606A-44A-2, which sounds unique. I'll keep my eyes peeled
> anyway.)
> I am also looking for expert opinion regarding the serial number.
> That is, I can't find one anywhere. Examination of the circuit
> indicates the prefix is either 943 or 009. The difference is
> Change C in the scan of 00606-90013 available at Agilent.
> This change replaced the coil forms with new ones that were
> interchangeable with the old. No further information is given,
> but my coils do not match the drawings. The manual shows
> allen-head tuning cores, while most of my coils have a slotted
> 6-32 stud. Are these the older ones?
>
> Thanks,
> Dave Wise
> ________________________________
> From: David Wise
> Sent: Saturday, May 15, 2010 7:24 AM
> To: hp_agilent_equipment at yahoogroups.com; r-390 at mailman.qth.net
> Subject: HP 606A: Seeking cabinet and RF shield
>
> I just found a present on my doorstep. It's an HP 606A RF Signal
> Generator.
> It's only the bare chassis, and the RF shield that covers the tuning
> coils etc is gone. Other than that it's untouched and complete, and I
> wouldn't
> be surprised at all if it worked. But without the shield it's pretty
much
> useless
> as a generator, as it will leak RF all over the place, and who wants to
> run a
> bare chassis? Does anyone have a cabinet and shield?
>
> Thanks,
> David Wise
>
> I'm near Portland Oregon.
>
>
> ------------------------------
>
> Message: 2
> Date: Wed, 19 May 2010 15:56:35 -0500
> From: Barry <n4buq at knology.net>
> Subject: Re: [R-390] HP 606A: Seeking cabinet and RF shield UPDATE
> To: David Wise <David_Wise at Phoenix.com>
> Cc: r-390 at mailman.qth.net, hp_agilent_equipment at yahoogroups.com
> Message-ID: <4BF45083.8020703 at knology.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> On 5/19/2010 2:19 PM, David Wise wrote:
>> There was one black beauty and one small axial-lead electrolytic.
>> I replaced them without even checking them. And some of the
>> coils had come loose and needed to be glued back onto the turrets.
>>
>> It works, on all bands, AM and CW. I think it's a winner,
>> so now I'm truly interested in a shield and cabinet. (I have
>> hear that the cabinet is common to many instruments of the
>> same vintage. However, the manual lists it as part number
>> 606A-44A-2, which sounds unique. I'll keep my eyes peeled
>> anyway.)
>> I am also looking for expert opinion regarding the serial number.
>> That is, I can't find one anywhere. Examination of the circuit
>> indicates the prefix is either 943 or 009. The difference is
>> Change C in the scan of 00606-90013 available at Agilent.
>> This change replaced the coil forms with new ones that were
>> interchangeable with the old. No further information is given,
>> but my coils do not match the drawings. The manual shows
>> allen-head tuning cores, while most of my coils have a slotted
>> 6-32 stud. Are these the older ones?
>>
>> Thanks,
>> Dave Wise
>>
>
> Mine has hex-key tuning cores. The cabinet says it's an 842 prefix.
>
> Barry - N4BUQ
>
>
> ------------------------------
>
> Message: 3
> Date: Wed, 19 May 2010 16:52:51 -0500
> From: "Bill Hawkins" <bill at iaxs.net>
> Subject: Re: [R-390] HP 606A: Seeking cabinet and RF shield UPDATE
> To: <r-390 at mailman.qth.net>
> Message-ID: <2973DE1647204AF7A508107990BD42AE at cyrus>
> Content-Type: text/plain; charset="us-ascii"
>
> David,
>
> I think I have what you need. I had a 606A once, gone now, but
> there's some mystery pieces left in the shop:
>
> Aluminum box with rack ears 7" high and 10.5" deep, no holes.
> Three smaller pieces of aluminum partial boxes, must be shields.
>
> If that sounds good, send me an address. No charge.
>
> Bill Hawkins
>
>
>
> ------------------------------
>
> _______________________________________________
> R-390 mailing list
> R-390 at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/r-390
>
>
> End of R-390 Digest, Vol 73, Issue 23
> *************************************
>
------------------------------
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