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October 21, 2017, 09:58:37 AM *
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 on: Yesterday at 01:17:47 PM 
Started by WA2SQQ - Last post by DMOD

...At some point perhaps I will find a studio or commercial recording mic to try on the V2.


The Shure 450 Series II dynamic mics, in the High Impedance switch position. has been an excellent performer for me for all of my vintage transmitters.

It has the just the right presence range peaking for those classic's.

Phil - AC0OB

 on: Yesterday at 12:37:12 PM 
Started by WU2D - Last post by W3RSW
Very few pix have detail I need to see better. Most, it's just nice to see already known rigs in this fest with decent call up speed on an iPad or older computer.

I wouldn't make these much larger than twice height and width, four times area, if you want to make them relatively speedy on most computers, or in deference to slower  net users on this site.  Perhaps dual sites for low and high res. pics would be possible.
Yes It is fun to read labels, sale prices, and rig details on hi-res pics.

Mucho Tnx to Todd fer posting them.

 on: Yesterday at 11:53:14 AM 
Started by ka1tdq - Last post by ka1tdq
Actually, all things considered, Iím very happy with my location. I live in Phoenix and the whole region is blanketed in HOAís. You can find neighborhoods without them, but the houses are typically smaller and older.

The power lines? Yeah, they cause lots of noise. The only way for me to overcome it is with SDR software. I canít use a traditional receiver on the low bands.

My dipole is an inverted V.  The apex is at the peak of the house, which is two story. Iíve painted the coax to match the color of the house, and the ends slope down to the brick wall. Itís all very hard to see and youíd never know that Iím a ham by looking at my house.

I did want to raise the ends of the dipole without being conspicuous.  I came up with this solution for the nighttime. It actually works out very well.


 on: Yesterday at 10:36:12 AM 
Started by WA2SQQ - Last post by WD8BIL
AC line filters almost always contain common mode chokes wound on a common core. Differential noise is very seldom the problem.

 on: Yesterday at 09:05:07 AM 
Started by no3m - Last post by N1BCG
I contacted someone who has experience restoring RME receivers...

RME didnít document things thoroughly so I donít have any official specifications for the transformer and I also checked my Peter Dahl catalog but they never made a replacement for the RME receivers.  In terms of ratings the B+ secondary will need to be anywhere from 300-340 volts each side of center, that is 600 to 640 volts total secondary voltage with a center tap and the current rating should be 100 mils or greater.  You will need a separate 5 volt 2 amp winding for the type 80 filamentary cathode.  Both sides of the filament string in the RME-69 are held above ground and a center tapped filament winding is used for all except the 42 output tube which is on a separate filament winding HOWEVER I see no reason why you cannot feed all of the filaments (except the rectifier of course) from the same center tap filament winding as long as the current capability is sufficient.  I expect the separate filament winding for the output tube was a carryover from the RME-9D design which used 2.5 volt tubes with a correspondingly  higher filament current-especially with the 2A5 output tube which drew almost 2 amps by itself so breaking up the filament string made sense.

You do need to use a center tapped filament winding for hum reduction given the layout and wiring of the RME-69.  Hammond likely has something suitable.

 on: Yesterday at 09:04:29 AM 
Started by ka1tdq - Last post by WBear2GCR
Can't really see the whole situation from your image.

My impulse reactions:

- move
- the power lines? not good.
- consider a magnetic loop antenna, Ted K1QAR has been getting excellent results.
- do you have an HOA there? move.

Where do you live? Looks like the southwest...

 on: Yesterday at 08:47:42 AM 
Started by WU2D - Last post by WBear2GCR
would be nice if higher res pix were posted up... most seem to be 640 wide... a bit old school sized, imo.

 on: Yesterday at 05:54:23 AM 
Started by W1RC - Last post by W1RC
Anyone have a junker with these parts?  Please email me at




 on: October 19, 2017, 09:35:42 PM 
Started by W1AEX - Last post by W1AEX
Here is a sneak peek at the soon to be released v1.2 of SDRuno. Looks like this will be a nice version with a number of improvements in the interface:


 on: October 19, 2017, 08:50:52 PM 
Started by W1DAN - Last post by KD6VXI

I have some 1.6 kv fets.

And I have a pdm modulator.

And I have a Viking II.

Would it really be as simple as using my hv fets in place of the irf640 I currently use and a larger potential power supply as well as that pesky damping diode to make a tube based pdm TX?

Something says no.


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