(9V battery not included)
DFD1-National
A custom version of DFD1   for most National radios.

LED backlit display module

 

Any DFD is available assembled for an additional $20.00

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With exceptional accuracy and stability

TCXO Reference Oscillator  included

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Works for Models : NC-33      IF=456KHz  NC-44      IF=456KHz  NC-45      IF=456KHz/ NC-57      IF=455KHz  NC-60      IF=455KHz  NC-77       IF=455KHz NC-80      IF=1560KHz  NC-88      IF=455KHz  NC-98      IF=455KHz NC-100    IF=456KHz NC-105    IF=455KHz  NC-109    IF=455KHz  NC-121    IF=455KHz  NC-125    IF=455KHz  NC-140    IF=2215KHz/230KHz NC-155    IF=2215KHz/230KHz NC-156    IF=2215KHz/230KHz NC-173    IF=455KHz NC-183    IF=455KHz/1720KHz NC-183D IF=455KHz/3.955MHz NC-188      IF=455KHz NC-190    IF=230KHz/2215KHz NC-200    IF=455KHz NC-240D IF=455KHz NC-270    IF=230KHz/2215KHz NC-300    IF=80KHz/2215KHz NC-303    IF=455KHz/2175KHz NC-400    IF=455KHz/1720KHz HRO-7       IF=456KHz HRO-50   IF=455KHz HRO-60   IF=455KHz/1720KHz Do not work on 6 Meter band

You simply adjust a 15 turn trimpot until the model of your radio is displayed ie: HQ-183D .  No other adjustments required. (See TWEAK mode below) It is easy and stable since there is nearly a full turn of the pot  per model. For those models that are dual conversion on some bands DFD1-National automatically detects the band and changes the IF offset. It has no controls. DFD1-National uses a 20 MHz TCXO reference so it can be easily calibrated by zero beating its oscillator against 20 MHz WWV's carrier. Jumper selectable 100Hz/1000Hz  resolution. Digital filtering to eliminate flicker due to round off uncertainty.

TWEAK MODE
provides optional accurate calibration capability.
The frequency (F) to which the radio is tuned is computed as
F = Local Oscillator freq +/- IF freq

DFD1-National assumes the IF frequencies shown in the chart above are the
actual IF frequencies of your radio.  However, some types use a crystal filter or
crystal controlled second conversion which make the actual IF frequency a function
of the frequency of those crystals which can vary a few hundred Hz from radio to radio.

A jumper on the PC board enables TWEAK mode. In TWEAK mode there is a 15 turn
trimpot which allows adjustment of the IF frequency +/- 12.8KHz in 100 Hz steps.

For dual conversion radios there is a separate TWEAK control for each IF frequency.

To adjust TWEAK mode, tune a known frequency (crystal calibrator etc.) for maximum
signal and adjust TWEAK control to cause correct frequency to be displayed on DFD.

PRICES: Available NOW

Complete kit $49.95 Add $2.50 S/H U.S.A. and Canada ($7.00 S/H foreign)

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Also available as a fully assembled digital dial

C-National

 

 Universal Interface makes it nearly plug-n-play (after you have installed it in a suitable cabinet)

How to Order

On-Line (click PayPal logo below)

• 

By Phone with Visa/MasterCard

• Call between 9AM and 9PM Pacific time, 7 days)
• 253-351-9316 ,

By FAX with Visa/MasterCard

253-931-1940

By Mail   Almost All Digital Electronics, 1412 Elm St. S.E., Auburn, WA 98092

E-Mail

neil@aade.com

AADE has an unconditional money bank guarantee even on kits (unless destroyed during assembly).

We have a free "we'll try to fix it if you just can't seem to get it to work" policy. ($4 return S/H charge)

We offer technical assistance from 9AM to 9PM Pacific time. (usually available on weekends) 

L/C Meter IIB you will love this one.

DFD2 for crystal controlled converters in front of tunable IF

DFD4 0-3GHz (build a bench-top frequency counter for about $70)

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