Cricket problem(s) solved?


Curt
 

N4QA posted frequency of 3.509 and 3.549 on QRPspots for his new Cricket.  "4SQRP Cricket at one watt to the GADS! antenna, using external 9V supply"  Evidently he is managed to operate witch success using other crystals.  Look forward to learning how to do the same.

72, Curt KB5JO



Curt
 

Now posting 3.549 on QRPspots "4SQRP Cricket with external 13.8 VDC supply and WW-II surplus FT-171-B rock at two watts to the GADS! antenna".  So maybe key is using old style crystals (more activity?) to get enough output from the oscillator to drive the PA.  I am going to try my 3548 FT243 to see what happens.


72, Curt KB5JO


Greg Parker
 

The question is do you have to modify the cricket to use 13.8v? To use other crystals? As I have several other crystals from kc9on.

Greg Parker
NM8B
Sent from my iPhone


Curt
 

I tried my (real) FT243 @ 3558.  Same results as with HC49 crystal on 3560.  Less than 400 mW and hot PA.

72, Curt KB5JO


Wayne Steury
 

Hello, Cricket people!

Through the comments of several I made some modifications to my Cricket.� I changed C9 to 180p and C10 to 470p.� Then I paralleled R1 with another 100K making 50K and paralleled R2 with a 1K to make .6K

It works with all crystals from KC9ON but lower power.� The best was my 3550 crystal that gives me about 400 milliwatts. Maybe these crystals vary. What do others say?� Using my old 3.579 I now seem to get 1 watt on my MFJ-971 tuner.� I have made several� QSOs on 3550.� It shows about the same db on reverse beacon.

I am sure interested in technical comments. Nothing seems to get hot with my regular CW and K1EL keyer.

73's Wayne� N9EGT� Berne, IN� See me on QRZ.com


On 7/17/2017 7:21 AM, gregory parker greg.parker13@... [4sqrp] wrote:
�

The question is do you have to modify the cricket to use 13.8v? To use other crystals? As I have several other crystals from kc9on.

Greg Parker
NM8B
Sent from my iPhone