开云体育

Interested in adding digital readout to the FRG-7
has anyone done this in the past few years?
what product did you get ?
I see possibilities on the net but I don't want to end up waiting weeks to get something that is a PIA to program

thanks

Hi Mike,
Quite a few digital readouts will work on the FRG-7. The problem is in getting an accurate readout down to 100 Hz.

Info on several counters can be found in the Files section folders 5 & 6.

An offset counter counting the VFO frequency will be at the mercy of the H. GEN. accuracy. If the HG 1 MHz crystal is off by 100 Hz the H.GEN output will be off by 300 Hz on the lowest band and 3,200 Hz on the highest band. This inaccuracy will carry through using most offset frequency counters.

The ESP DD-103 can hold corrected offsets for 32 bands so it could be set to be accurate on an FRG-7.

I would check your H.GEN for accuracy before buying a display. If it is dead on any of the counters in Folder 6 would work well.

My plan is to see if the HG crystal can be modified to use a trimmer to net it to 1 MHz. If it can't I intend to replace the crystal with a TCXO module that can be netted to 1 MHz. The TCXO may not work properly with the Harmonic Generator (HG) circuit as is.

73
Roger VE7LB

Thanks,

I was thinking only of the kHz dial replacement. The DD-103 is way above what I want to spend for this project, I was thinking of around $25.

This is the direction I am looking to go

I would like to find a display that would fit in the window where the drum is right now

Allowing that I am an ideas man who never actually gets
on with anything ....

I wondered about replacing the MHz selector with a variable resistor,
and then using a PIC or Arduino to measure the resistance and
use that to control a digital VFO to replace the Wadley Loop?

Not really thought that through, but converting to a single
conversion superhet.

Hi Mike,
How about a counter for about $10 delivered? Take a look at eBay item # 121239170838 . Quite a few people have had success with these cheap counters. Red, Blue and Green versions available.

Look at the eBay opportunist that is putting these displays in a case and selling them for $150! See item # 353595762412. He actually started off at $250!

Display Dimensions: Length — width — height : 91 mm — 28 mm — 20 mm. You may want to put black tape over the digits you don't want to see so the 91 mm would be reduced for the FRG-7 window.

The FRG-7 VFO works backwards. The low end of a band is 3.455 MHz and the high end is 2.455 MHz. The display allows count direction and offsets to be programmed in. 3.455 MHz in would read 00.000.0, 2.555 MHz would read 00.900.0 and 2.455 MHz would be back at 00.000.0.

There is a lot of info on the net about programming. Even some uTube videos.

73
Roger VE7LB

I started looking on ebay and discovered better deals on amazon for US vendors, avoiding possible a one month wait

I have narrowed it down to two choices, one of them being that model you recommended

I really like that display box that the $150 counter uses, I haven't come across one like that on ebay or amazon yet

The original manufacturer of these cheap readouts is SanJian Studio. The problem with the Chinese is that they don't just pirate from other countries but also from each other! As long as they are getting good feedback they should be OK.

It's too bad that they don't have a 3/8 " digit version as they would be easier to fit into the FRG-7.

When I buy from China using Standard SpeedPak it usually takes 2 weeks to Canada. But with Covid delays Amazon would be faster.

I did search for the cases as well. They are probably coming from one of the USA Electronics surplus companies.

I think I found some nice cases on ebay

I just split off "Why would anyone want a digital frequency display on a FRG-7?" into a different message topic.

I see this case that would work with blue LED's. . It would have to stand on it's side due to the side ribs. They are also made in red. What item # is the case

And

It looks like either of those cases would work. I see some interesting Hammond cases . They even have red front windows available.

I am trying to locate the source of the opportunist cases on ebay. I copied the best case picture and then removed the display and switch from the front and tried a picture match search. So far no luck but I know I have something in a case that has the same top ribs. Will take a look around.

I am going to add a folder to the Files display section and add the SanJ instructions there.

Hi Mike,
I did some measurements of the Black eBay case by using the 85mm display mounting screw centers and scaling that to the width of the case. I came up with 135 mm wide (5.31 inches) wide.

I started searching Goggle for cases 135mm (5.3 inches) wide and eventually found the All Electronics 1598BSGY case in gray with the ribbed ribbon around it.

A google of 1598BSGY took me back to the Hammond site where I found the Hammond Black 1598BBK case. They are 5.26 deep x 5.3 wide x 2 inches high. https://www.hammfg.com/electronics/small-case/plastic/1598 .

The cases can have plastic or metal end plates. I suspect that they can be ordered with smokey or red translucent end panels as Hammond has them for other cases. It wouldn't be hard to cut some smokey or red translucent front pieces bought from a plastics or art shop.

73
Roger VE7LB