Re: [Drakelist] Drake 2-C noise blanker
Is a schematic and parts list available for the 2NB? Any possibility of duplicating it? How well does it work, in other words would it be worth the effort? . 73 de W3NU On 4/15/2013 0942, Ronald Baker wrote: I have pictures of the 2C and all the accessories on my Drake Website. Here is the link to that page: http://www.wb4hfn.com/DRAKE/DrakeEquipmentPictures/Equip_2C.htm Maybe once a year you may see the 2NB noise blanker listed on eBay, but they are very rare. The one's I have seen sold on ebay range from $100 to $140. 73, Ron / WB4HFN Sent from my old computer that I purchased new before the Dead Sea got sick. *From:*drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] *On Behalf Of *Bill Frost *Sent:* Monday, April 15, 2013 7:42 AM *To:* Drake List *Subject:* Re: [Drakelist] Drake 2-C Question Hello Ken, The 2-NB noise blanker, for the 2-C receiver, originally sold for around $27.00 and was a plug in option. If you Google Drake 2-NB you should get a link to Universal Radio site with a picture and description of the 2-NB. There were not to many manufactured, so they are quite rare. 73, Bill wd8dfp ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Drake 2-C noise blanker
Charles, A large part of it depends on whether your 2-C suffers from the type of noise (pulse type) that the noise blanker can help with. I have bad power line noise at my QTH that a blanker won't touch. 73, Eric Webner K4FAN The DStar FAN Club On Apr 15, 2013 3:04 PM, Charles Ring w...@roadrunner.com wrote: Is a schematic and parts list available for the 2NB? Any possibility of duplicating it? How well does it work, in other words would it be worth the effort? . 73 de W3NU On 4/15/2013 0942, Ronald Baker wrote: I have pictures of the 2C and all the accessories on my Drake Website.*** * Here is the link to that page: ** ** http://www.wb4hfn.com/DRAKE/DrakeEquipmentPictures/Equip_2C.htm ** ** Maybe once a year you may see the 2NB noise blanker listed on eBay, but they are very rare. ** ** The one’s I have seen sold on ebay range from $100 to $140. ** ** 73, Ron / WB4HFN ** ** ** ** ** ** Sent from my old computer that I purchased new before the Dead Sea got sick. ** ** ** ** *From:* drakelist-boun...@zerobeat.net [ mailto:drakelist-boun...@zerobeat.net drakelist-boun...@zerobeat.net] *On Behalf Of *Bill Frost *Sent:* Monday, April 15, 2013 7:42 AM *To:* Drake List *Subject:* Re: [Drakelist] Drake 2-C Question ** ** Hello Ken, ** ** The 2-NB noise blanker, for the 2-C receiver, originally sold for around $27.00 and was a plug in option. If you Google Drake 2-NB you should get a link to Universal Radio site with a picture and description of the 2-NB. There were not to many manufactured, so they are quite rare. ** ** 73, Bill wd8dfp -- ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Drake 2-C noise blanker
- Original Message - From: Eric Webner k4fan.hamra...@gmail.com To: Charles Ring w...@roadrunner.com Cc: Drake List drakelist@zerobeat.net Sent: Monday, April 15, 2013 12:10 PM Subject: Re: [Drakelist] Drake 2-C noise blanker Charles, A large part of it depends on whether your 2-C suffers from the type of noise (pulse type) that the noise blanker can help with. I have bad power line noise at my QTH that a blanker won't touch. 73, Eric Webner K4FAN The DStar FAN Club On Apr 15, 2013 3:04 PM, Charles Ring w...@roadrunner.com wrote: Is a schematic and parts list available for the 2NB? Any possibility of duplicating it? How well does it work, in other words would it be worth the effort? . 73 de W3NU Same here. I thought for a long time that the noise blanker in my R4B didn't work. I tested it with a pulse generator consisting of three 9 volt batteries in series, a bug, and a 4 Hy choke. The blanker does not exactly remove the pulses but knocks the effect on the AVC down by at least 20db. Its completely ineffective on power line noise such as the hash from compact fluorescent lamps or defective streetlights. A plain series clipper works to some extent on those but is usually at the end of the IF chain, that is at the detector, so does not prevent the noise from actuating the AVC and desensitizing the receiver. At one time ignition noise was a real problem and may still be for mobile operation, but I never hear it at my house. -- Richard Knoppow Los Angeles WB6KBL dickb...@ix.netcom.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Drake 2-C noise blanker
Hello, Looks like my cut and paste didn't work. So, I'll type the sheet We would advise that there are several factors which should be taken into consideration in connection with Noise Blanker operation. First of all, it is normal for a blank noise pulse to turn off the receiver for the duration of the pulse. This makes a hole in the received envelope. If the noise has a definite frequency rate, the signal will appear to be modulated at the noise frequency. The noise blanker is the most effective on noise pulses of very short duration with a relatively long time between pauses. A prime example of this type noise is that which is generated by automobile ignition systems. It is least effective with noise pulses of relatively long duration with short spacing in between pulses: an example of this is atmospheric noise. There are occasional conditions when an adjacent signal which you cannot hear in the R-4A output, will operate the noise gate and produce distortion. The reason for this is that the bandwidth of the noise blanker IF following the passband tuner is considerably wider than the passband filter itself. This broadness is a prime requirement for noise blanker operation. It should be kept in mind that the noise blanker is not needed and therefore should not be used, if the noise which you hear is equal to or less than the strength of the received signal. However, if the noise exceeds the strength of the received signal, the noise blanker will be a definite advantage and should be switched on. If after the above suggestions, you feel that your noise blanker is operating improperly, write in more detail concerning your observations and we will try to of additional assistance. R L DRAKE COMPANY Service Department 67/3 From: Bill Frost wd8...@yahoo.com To: Drake List drakelist@zerobeat.net Sent: Monday, April 15, 2013 7:12 PM Subject: Re: [Drakelist] Drake 2-C noise blanker Hello to the Group, While looking up information on the 2-NB for Ken, I found this sheet on noise blanker operation. This was written for the R-4A noise blanker, but someone wrote 2-NB on the sheet, so ... This was written back in March of 1967, most likely by an engineer for the service department, but not for me, as I was on the R-4A production line as a tester. 73, Bill From: Eric Webner k4fan.hamra...@gmail.com To: Charles Ring w...@roadrunner.com Cc: Drake List drakelist@zerobeat.net Sent: Monday, April 15, 2013 3:10 PM Subject: Re: [Drakelist] Drake 2-C noise blanker Charles, A large part of it depends on whether your 2-C suffers from the type of noise (pulse type) that the noise blanker can help with. I have bad power line noise at my QTH that a blanker won't touch. 73, Eric Webner K4FAN The DStar FAN Club On Apr 15, 2013 3:04 PM, Charles Ring w...@roadrunner.com wrote: Is a schematic and parts list available for the 2NB? Any possibility of duplicating it? How well does it work, in other words would it be worth the effort? . 73 de W3NU On 4/15/2013 0942, Ronald Baker wrote: I have pictures of the 2C and all the accessories on my Drake Website. Here is the link to that page: http://www.wb4hfn.com/DRAKE/DrakeEquipmentPictures/Equip_2C.htm Maybe once a year you may see the 2NB noise blanker listed on eBay, but they are very rare. The one’s I have seen sold on ebay range from $100 to $140. 73, Ron / WB4HFN Sent from my old computer that I purchased new before the Dead Sea got sick. From:drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] On Behalf Of Bill Frost Sent: Monday, April 15, 2013 7:42 AM To: Drake List Subject: Re: [Drakelist] Drake 2-C Question Hello Ken, The 2-NB noise blanker, for the 2-C receiver, originally sold for around $27.00 and was a plug in option. If you Google Drake 2-NB you should get a link to Universal Radio site with a picture and description of the 2-NB. There were not to many manufactured, so they are quite rare. 73, Bill wd8dfp ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
