Re: [Drakelist] VFO for 2NT

2019-12-06 Thread Dale Parfitt
If anyone is interested I have a  nicely built DDS VFO for the Drake C line. I 
have only programmed the 80M offset but it can do all the bands. I used it for 
a couple of years until I bought my TR-7. Output level was raised to provide 
the correct levels for the  RX and TX.

The enclosure is ‘Drake Like’ and also has a switch to allow for a RX Only 
antenna. All teflon cables provided. It plugs in the R-4C accessory socket with 
a minor mod to the socket. Pix available.

 

Dale W4OP

 

 

From: Drakelist [mailto:drakelist-boun...@zerobeat.net] On Behalf Of 
dlestourg...@cox.net
Sent: Thursday, December 5, 2019 10:40 PM
To: 'Greg N9NWO'; drakelist@zerobeat.net
Subject: Re: [Drakelist] VFO for 2NT

 

I have used the digital VFO kit from James Hagerty. It is really slick. I am 
also using a Micro Bitx to drive my Heath DX60B. This provides a receiver as 
well and not expensive.

 

Dale K5AJZ

 

From: Drakelist  On Behalf Of Greg N9NWO
Sent: Wednesday, December 4, 2019 10:42 AM
To: drakelist@zerobeat.net
Subject: [Drakelist] VFO for 2NT

 

I have seen the Hallicrafters HA-5.  Wondering if there were a modern VFO for 
crystal transmitters.

I currently have a TR-7 and TR-4.  Just bought a 2C/2NT and have a Heathkit 
HW-16 with VFO.

N9NWO

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Re: [Drakelist] VFO for 2NT

2019-12-05 Thread dlestourgeon
I have used the digital VFO kit from James Hagerty. It is really slick. I am 
also using a Micro Bitx to drive my Heath DX60B. This provides a receiver as 
well and not expensive.

 

Dale K5AJZ

 

From: Drakelist  On Behalf Of Greg N9NWO
Sent: Wednesday, December 4, 2019 10:42 AM
To: drakelist@zerobeat.net
Subject: [Drakelist] VFO for 2NT

 

I have seen the Hallicrafters HA-5.  Wondering if there were a modern VFO for 
crystal transmitters.

I currently have a TR-7 and TR-4.  Just bought a 2C/2NT and have a Heathkit 
HW-16 with VFO.

N9NWO

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Re: [Drakelist] VFO for 2NT

2019-12-04 Thread Bill KA8VIT
I have an Arduino based DDS VFO with a buffer amplifier that drives my Heathkit 
DX-20.

It makes the DX-20 frequency agile.

So great!  HI HI

Cost like $25 in parts.

73 - Bill KA8VIT


> On December 4, 2019 at 11:42 AM Greg N9NWO  wrote: 
> 
> I have seen the Hallicrafters HA-5.  Wondering if there were a modern VFO for 
> crystal transmitters. 
> 
> I currently have a TR-7 and TR-4.  Just bought a 2C/2NT and have a Heathkit 
> HW-16 with VFO. 
> 
> N9NWO___ 


 
Bill Chaikin, KA8VIT
USS COD Amateur Radio Club - W8COD
WW2 Submarine USS COD SS-224 (NECO)

ka8...@ka8vit.com
http://ka8vit.com
http://www.usscod.org


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Re: [Drakelist] VFO for 2NT

2009-01-25 Thread W4AWM
Hi Bill,
 
I am sure someone will come up with a manual, I don't have one.
 
It would appear that the VFO frequency output should be the same as  the 
fundamental frequency of whatever crystals are required buy the  manufacturer. 
The 
only thing you will have to watch is the amplitude  of the output from the 
VFO.
 
73 and good luck,
 
John,  W4AWM
**From Wall Street to Main Street and everywhere in between, stay 
up-to-date with the latest news. (http://aol.com?ncid=emlcntaolcom0023)
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Re: [Drakelist] VFO for 2NT

2009-01-25 Thread Kevin LaHaie

From the 2NT Manual:

80 meters Crystal X 1 3.5 - 3.8mhz
40 meters: Crystal X 1 7.0 to 7.2
20 meters: Crystal X 2 7.0 to 7.125
15 meters Crystal X 3  7.0 to 7.083
10 meters Crystal X 4 7.0 to 7.125

So, looke like 7 to 7.2 gets you everything BUT 80 meters on this radio.

Bill Ellis wrote:

Hi all,

If I were building a VFO for a 2NT, what would be my frequency range 
for the output to plug it into the crystal socket on the front?


Thanks,

Bill, WB9CAC


  


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Re: [Drakelist] VFO for 2NT

2009-01-25 Thread Dino Papas
Bill -- there is an addendum page for the 2NT manual that gives you  
the frequency ranges and drive levels required; I'm sending that to  
you direct as I'm not sure it'll make it thru the mail list.  I've  
used the Norcal FCC-1/2 DDS VFO/counter to drive the 2NT.  The DDS  
board puts out enough to drive the rig on 80/40m since the rig only  
requires about 1V RMS of drive (3.5 Mhz and 7 MHz respectively); for  
20m and above it takes 4/12/4V RMS respectively at 7 MHz.


Although I have yet to try it here's a suggestion from W3CD that I  
got a while back on how to step up the drive from the VFO to perhaps  
meet the higher drive requirements:


From: Bob Okas vinta...@earthlink.net
Date: April 17, 2008 2:55:16 PM EDT
To: 'Dino Papas' k...@cox.net
Subject: RE: Using the FCC-1/2 with a Tube Type Transmitter

Greetings Dino,

The matching network is a simple L-network that matches the 50 Ohm  
output impedance of the FCC-2 to a higher impedance transmitter  
input. The inductor is in series with the FCC-2 output and the cap  
shunts the TX side of the network. The trick is determining what the  
2-NT’s input impedance is. A good starting point is to guess around  
1K. The network will offer roughly a 20x voltage step-up, which  
should be adequate to drive the TC on the higher bands.


To determine what component values to use for the L-network, look at:  
http://bwrc.eecs.berkeley.edu/Research/RF/projects/60GHz/matching/ 
ImpMatch.html


Use a Q value of 7 and you should get some reasonable values.

73,
Bob – W3CD

Hope this helps.

73 -- Dino KL0S

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Re: [Drakelist] VFO for 2NT

2009-01-25 Thread py2xb

 Bill, page 9 of the 2NT Manual says  

 80m crystal 3.5MHz to 3.8MHz   Output Freq  3.5MHz to 3.8MHz  

 40m crystal 7.0MHZ to 7.2MHzOutput Freq  7.0MHz to 7.2MHz  

 20m crystal 7.0MHZ to 7.125MHzOutput Freq  14.0 to 14.25Mhz
 15m crystal 7.0MHZ to 7.083MHzOutput Freq  21.0 to 21.25Mhz  

 10m crystal 7.0MHZ to 7.125MHzOutput Freq  28.0 to 28.50Mhz  

  So, if your VFO covers 80m and 40m you will do it. Yes you will
need to make sure you do not overload the 6EA8.  

 Also if your VFO cover the fundamental frequency of 20/15/10m it
will ork as wel.  Regards Fred PY2XB 
 On Sun, 25 Jan 2009 16:27:21 -0200, Bill Ellis  wrote:
 Hi all,
 If I were building a VFO for a 2NT, what would be my frequency range
for the output to plug it into the crystal socket on the front?
 Thanks,
 Bill, WB9CAC
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Re: [Drakelist] VFO for 2NT

2009-01-25 Thread Mark Pilant

Some observations:

It appears the 2NT is using harmonics of the fundamental for 20m,
15m, and 10m.  With a VFO, I expect it would have to be designed
to provide these harmonics or the actual fundamental frequencies.
For harmonics, they would have to be of the appropriate amplitude,
and I imagine there would also have to be a fairly reasonable
low-pass filter to make sure unwanted harmonics were attenuated.

Just some thoughts...

73

- Mark  N1VQW

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