[Hallicrafters] Hallicrafters Digest, Vol 134, Issue 12
james.liles at comcast.net
james.liles at comcast.net
Thu Mar 26 11:47:59 EDT 2015
Good morning didn't get your name,
The 6.0 to 6.5 output is the first I.F. not the VFO.
The VFO is 4.35Mc to 4.85Mc
Good luck ---- Kindest regards Jim K9AXN
-----Original Message-----
From: hallicrafters-request at mailman.qth.net
Sent: Thursday, March 26, 2015 8:34 AM
To: hallicrafters at mailman.qth.net
Subject: Hallicrafters Digest, Vol 134, Issue 12
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Today's Topics:
1. SX-117 VFO output (Jeff)
2. SX-62 Sensitivity capacitor (Waldo Magnuson)
3. Re: SX-62 Sensitivity capacitor (Richard Knoppow)
4. Re: SX-62 Sensitivity capacitor (Asif Khan via Hallicrafters)
5. Re: SX-62 Sensitivity capacitor (Richard Knoppow)
6. Re: SX-62 Sensitivity capacitor (Chuck McGregor)
----------------------------------------------------------------------
Message: 1
Date: Sat, 21 Mar 2015 11:06:57 -0400
From: Jeff <jeff at podengo.com>
To: Hallicrafters at mailman.qth.net
Subject: [Hallicrafters] SX-117 VFO output
Message-ID: <550D8911.9080306 at podengo.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Does anyone know the specs on the VFO output of the SX-117?
According to the manual, it has a 6-6.5 MHz output, but I can't seem to
find anything on the output level. I tried hooking it to my Hammarlund
HX-50A external VFO input, but I don't seem to be getting anything out
of the 117. The external VFO input on the HX-50A is fine; I'm driving
it with a DDS VFO in stand alone mode. The HX-50A is looking for the
same frequency output at approximately 3v.
I was looking to try to get these two rigs to work in transceiver mode.
For some reason, Hammarlund receivers weren't built to do this.
Appreciate any thoughts or advice.
------------------------------
Message: 2
Date: Thu, 26 Mar 2015 03:24:26 +0000 (GMT)
From: Waldo Magnuson <magnuson at mac.com>
To: "hallicrafters at mailman.qth.net" <hallicrafters at mailman.qth.net>
Subject: [Hallicrafters] SX-62 Sensitivity capacitor
Message-ID: <8e09f014-c966-404e-9413-4526ef960dfd at me.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi,
? ?I'm trying to straighten out a somewhat hacked SX-62 and have a question
about the Sensitivity Control bypass capacitor value. ?My schematic shows
0.22 uf (C24) but in both SX-62s I have (I have 2) there has been a 100 uf
capacitor plus the 0.22. ?Has there been a suggested modification to the C24
value? Thanks.
Skip W7WGM
------------------------------
Message: 3
Date: Wed, 25 Mar 2015 23:02:12 -0700
From: Richard Knoppow <1oldlens1 at ix.netcom.com>
To: hallicrafters at mailman.qth.net
Subject: Re: [Hallicrafters] SX-62 Sensitivity capacitor
Message-ID: <5513A0E4.4050703 at ix.netcom.com>
Content-Type: text/plain; charset=windows-1252; format=flowed
Do you mean 100 uf or uuf (pf)? If the latter sometimes small
caps were put in parallel with larger ones to insure bypassing at high
frequencies.
On 3/25/2015 8:24 PM, Waldo Magnuson wrote:
> Hi,
> I'm trying to straighten out a somewhat hacked SX-62 and have a
> question about the Sensitivity Control bypass capacitor value. My
> schematic shows 0.22 uf (C24) but in both SX-62s I have (I have 2)
> there has been a 100 uf capacitor plus the 0.22. Has there been a
> suggested modification to the C24 value? Thanks.
> Skip W7WGM
> ______________________________________________________________
> Hallicrafters mailing list
> Home: http://mailman.qth.net/mailman/listinfo/hallicrafters
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Hallicrafters at mailman.qth.net
>
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
>
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
--
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL
------------------------------
Message: 4
Date: Thu, 26 Mar 2015 02:09:07 -0400
From: Asif Khan via Hallicrafters <hallicrafters at mailman.qth.net>
To: Hallicrafters at mailman.qth.net
Subject: Re: [Hallicrafters] SX-62 Sensitivity capacitor
Message-ID: <14c54b2d227-675b-4f20 at webprd-a49.mail.aol.com>
Content-Type: text/plain; charset=utf-8
The .22uF in parallel with the 100uF (yes that value is correct) across the
sensitivity pot was also used in all of the SX-42 receivers except the
really early ones.
Nick
-----Original Message-----
From: Richard Knoppow <1oldlens1 at ix.netcom.com>
To: hallicrafters <hallicrafters at mailman.qth.net>
Sent: Wed, Mar 25, 2015 11:02 pm
Subject: Re: [Hallicrafters] SX-62 Sensitivity capacitor
Do you mean 100 uf or uuf (pf)? If the latter sometimes small
caps were put
in parallel with larger ones to insure bypassing at high
frequencies.
On
3/25/2015 8:24 PM, Waldo Magnuson wrote:
> Hi,
> I'm trying to straighten
out a somewhat hacked SX-62 and have a
> question about the Sensitivity
Control bypass capacitor value. My
> schematic shows 0.22 uf (C24) but in
both SX-62s I have (I have 2)
> there has been a 100 uf capacitor plus the
0.22. Has there been a
> suggested modification to the C24 value? Thanks.
>
Skip W7WGM
> ______________________________________________________________
>
Hallicrafters mailing list
> Home:
http://mailman.qth.net/mailman/listinfo/hallicrafters
> Help:
http://mailman.qth.net/mmfaq.htm
> Post:
mailto:Hallicrafters at mailman.qth.net
>
> List Administrator: Duane Fischer,
W8DBF
> ** For Assistance: dfischer at usol.com **
>
>
> This list hosted
by: http://www.qsl.net
> Please help support this email list:
http://www.qsl.net/donate.html
>
--
Richard
Knoppow
1oldlens1 at ix.netcom.com
WB6KBL
______________________________________________________________
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Help:
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Post:
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------------------------------
Message: 5
Date: Wed, 25 Mar 2015 23:22:25 -0700
From: Richard Knoppow <1oldlens1 at ix.netcom.com>
To: hallicrafters at mailman.qth.net
Subject: Re: [Hallicrafters] SX-62 Sensitivity capacitor
Message-ID: <5513A5A1.6020507 at ix.netcom.com>
Content-Type: text/plain; charset=windows-1252; format=flowed
After looking at three versions of the handbook on BAMA it
appears that there are both a 0.22 or 0.25uf and a 100 uf across the
same point. The 100 uf is C-127 I can't make out why other than they
may be physically separated. Very odd arrangement. This appears to
vary the screen grid voltage on V2.
On 3/25/2015 8:24 PM, Waldo Magnuson wrote:
> Hi,
> I'm trying to straighten out a somewhat hacked SX-62 and have a
> question about the Sensitivity Control bypass capacitor value. My
> schematic shows 0.22 uf (C24) but in both SX-62s I have (I have 2)
> there has been a 100 uf capacitor plus the 0.22. Has there been a
> suggested modification to the C24 value? Thanks.
> Skip W7WGM
> ______________________________________________________________
> Hallicrafters mailing list
> Home: http://mailman.qth.net/mailman/listinfo/hallicrafters
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Hallicrafters at mailman.qth.net
>
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
>
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
--
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL
------------------------------
Message: 6
Date: Thu, 26 Mar 2015 06:34:31 -0700
From: Chuck McGregor <cbmcgr at gmail.com>
To: Richard Knoppow <1oldlens1 at ix.netcom.com>
Cc: "hallicrafters at mailman.qth.net" <hallicrafters at mailman.qth.net>
Subject: Re: [Hallicrafters] SX-62 Sensitivity capacitor
Message-ID:
<CAFTq00Q+r+wZo423SW5nbbWp_2TB+jZ_S0ngLc0+vGoyg2b7WA at mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
C127, the 100mfd capacitor was added to the early SX-42 schematic, as
documented in change 16 in Hallicrafters Service Hint #21 dated
October 20, 1947. It was correctly added to the schematic, but on
some SX-42 parts lists it was erroneously listed as 100 or 110 mmf.
Service Hint #21 is in BAMA:
http://bama.edebris.com/manuals/hallicra/sx42/
-Chuck K7MCG
On Wed, Mar 25, 2015 at 11:22 PM, Richard Knoppow
<1oldlens1 at ix.netcom.com> wrote:
> After looking at three versions of the handbook on BAMA it appears
> that there are both a 0.22 or 0.25uf and a 100 uf across the same point.
> The 100 uf is C-127 I can't make out why other than they may be
> physically
> separated. Very odd arrangement. This appears to vary the screen grid
> voltage on V2.
>
> On 3/25/2015 8:24 PM, Waldo Magnuson wrote:
>>
>> Hi,
>> I'm trying to straighten out a somewhat hacked SX-62 and have a
>> question about the Sensitivity Control bypass capacitor value. My
>> schematic
>> shows 0.22 uf (C24) but in both SX-62s I have (I have 2) there has been a
>> 100 uf capacitor plus the 0.22. Has there been a suggested modification
>> to
>> the C24 value? Thanks.
>> Skip W7WGM
>> ______________________________________________________________
>> Hallicrafters mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/hallicrafters
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Hallicrafters at mailman.qth.net
>>
>> List Administrator: Duane Fischer, W8DBF
>> ** For Assistance: dfischer at usol.com **
>>
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>
> --
> Richard Knoppow
> 1oldlens1 at ix.netcom.com
> WB6KBL
>
> ______________________________________________________________
> Hallicrafters mailing list
> Home: http://mailman.qth.net/mailman/listinfo/hallicrafters
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Hallicrafters at mailman.qth.net
>
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
>
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
------------------------------
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